MCAT 2002 form BG

[Tweetie_bird]

****ty, just plain ****ty. What did y'all think about it? I can't believe how crappy that test was. All the stuff I studied....I might as well not have studied with the way the test was made. There would be no difference in scores.

Few quick things about specific questions:

1. The question about a gene increasing in frequency, and a chart was given. I believe the question was "when does the Heterozygote frequency increase most...." or something like that. I don't even remember what I picked, but what was the answer?

2. The thing about a parachute dropping something to a bunch of hikers on ground. The plane is going 100 m/s and is 500m above ground. What horizontal distance should they be away from the hikers to make sure that the package falls within their reach? I guessed--500m. What the hell was that?

3. Insulin most likely looks like--oxytocin, epinephrine, cortisol and something else. I picked Epi b/c I assumed it was a peptide hormone and works through second messenger much like Epi. Is that even right?

4. Why does something in water travel faster than in air? I picked the answer about how water molecules are closer together, and air molecules are further apart. Is that right?

5. The whole diarrhoea passage! EEK! Was that a bacteria or was it a virus?? I picked Parasitic Animal (b/c it lived in the villi of the intestines and replicated there..therefore, it was parasitic.) Also, the RNA transcript found in it....did it belong to the bacteria or a virus within it?? I picked the latter b/c when gene sequences were compared across different species of that bacteria, nothing was found in common. Therefore, it would have to be a virus. Plus, they said that cell wall antibiotics didn't work on it...which means resistance could be conferred upon the bacteria by the virus.
I hope I have this right.

Please...help me calm my fears! <img border="0" title="" alt="[Frown]" src="frown.gif" />

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[Medical123]

A lot of those questions were on my form also. I thought they were pretty tough. Like you, I am not sure what I picked for heterozygote gene frequency. I just kind of guessed. I want to say I put something like around generation 40, but like I said, I was pretty clueless on that one.

I also guessed 500m on the question about the plane and the hikers.

I don't recall the insulin question. It may have been on my form, but I ran out of time with about 5 questions left to go.

I had a question about the sound waves in air and water, but I don't remember what I put down for that one.

I thought that the diarrhea passage was a killer. I put virus for the RNA transcript, but I don't even remember the other question.

Oh well, I guess we will find out in about 60 days.

 

[Papa Smurf]

•••quote:•••Originally posted by Tweetie_bird:
•****ty, just plain ****ty. What did y'all think about it? I can't believe how crappy that test was. All the stuff I studied....I might as well not have studied with the way the test was made. There would be no difference in scores.

Few quick things about specific questions:
•••••Bio was a bitch. Verbal wasn't any fun either. The only reasonable section was PS.

• •••quote:•••
1. The question about a gene increasing in frequency, and a chart was given. I believe the question was "when does the Heterozygote frequency increase most...." or something like that. I don't even remember what I picked, but what was the answer?
•••••Screwed up question, I dunno. I forgot what I put also. Maybe at 50%?

• •••quote:•••
2. The thing about a parachute dropping something to a bunch of hikers on ground. The plane is going 100 m/s and is 500m above ground. What horizontal distance should they be away from the hikers to make sure that the package falls within their reach? I guessed--500m. What the hell was that?
•••••X = .5at^2
500 = .5*10*t^2
t = 10
horizontal velocity is constant throughout so, d = v*t or d= 100*10 = 1000m

• •••quote:•••
3. Insulin most likely looks like--oxytocin, epinephrine, cortisol and something else. I picked Epi b/c I assumed it was a peptide hormone and works through second messenger much like Epi. Is that even right?
•••••My reasoning was the same as yours. Not sure if it's right, but better than a blind guess.

• •••quote:•••
4. Why does something in water travel faster than in air? I picked the answer about how water molecules are closer together, and air molecules are further apart. Is that right?
•••••Sounds good.

• •••quote:•••
5. The whole diarrhoea passage! EEK! Was that a bacteria or was it a virus?? I picked Parasitic Animal (b/c it lived in the villi of the intestines and replicated there..therefore, it was parasitic.) Also, the RNA transcript found in it....did it belong to the bacteria or a virus within it?? I picked the latter b/c when gene sequences were compared across different species of that bacteria, nothing was found in common. Therefore, it would have to be a virus. Plus, they said that cell wall antibiotics didn't work on it...which means resistance could be conferred upon the bacteria by the virus.
I hope I have this right.
•••••I dunno, I'd just like to forget about this entire section if I could. You seem like you made some really educated guesses. You'll be fine.

 

[Street Philosopher]

I got a lot of the same questions.

For the heterozygote frequency, it was a straightforward-read-the-chart question. It was somewhere around the middle, where the hump was the highest.

Parachute dropping I guessed 1000m. No idea how to solve that right now.

I didn't have your insulin question, but I think epinephrine is a neurotransmitter instead of a peptide hormone. Not sure about that, but your guess one of the two I would have reduced it down to; the other one is oxytocin because I don't know what oxytocin is categorized as. I'm pretty sure cortisol is a steroid.

Things travel in air faster because the molecules are close together; your answer is correct.

For the diarrhea passage I put single celled protozoa. Apparently protozoa are protists and some of them are parasites. The dsRNA is from a virus that infected the organism.

So it looks like you got similar answers to me for some of them. The remaining answers I don't know about but you chose 1 of the 2 I narrowed it down to so that's a good sign for us. Don't sweat it!

 

[limit]

1. Don't remember that one either. Wierd section that was.

2. 1000m I believe. You had to determine the time it took for it to hit the ground (x=1/2*a*t^2). Then use that time in the x = v * t equation, so dist = 100 x 10 seconds ==&gt; 1000
I was actually surprised they threw this in, its a 2-stepper. I had some time left over at the end so I spent it doing this problem.. lol.. would be funny if I got it wrong

3. Dont remember about insulin (i had form AG) but one of my questions had "epinephrine and norepinephrine" as an answer choice I remember choosing that.

4. Yes I put that too, the distance of the molecules. I came to that conclusion via elimination, but it also made the most sense.

5. I put virus. They said in the passage it wasn't a bacteria. But I think they said "single-cell" to trick people into choosing protozoa. They did speak of dormancy (i think) which is a viral property. I wasn't 100% sure, it came down do protozoa and virus for me and I chose virus.

Anyone remember the answer to the circadian rhythms and the stupid sheep that eat either in the morning or in the afternoon, whatever it was?

 

[Doctora Foxy]

TweetieBird, where the he11 have you been?? I haven't seen you post in soooo long, nice to have you back! Glad that the mcat is finally over, huh? I'm sure you did well---you know your stuff.

 

[limit]

I actually had a little diarrhea just prior to the bio section, I spent my whole break in the baffroom. The diarrhea passage just made me feel bad and funny at the same time, short circuiting my brain cells.

 

[Medical123]

Quoted from Papa Smurf:

2. The thing about a parachute dropping something to a bunch of hikers on ground. The plane is going 100 m/s and is 500m above ground. What horizontal distance should they be away from the hikers to make sure that the package falls within their reach? I guessed--500m. What the hell was that?
[/qb][/QUOTE]X = .5at^2
500 = .5*10*t^2
t = 10
horizontal velocity is constant throughout so, d = v*t or d= 100*10 = 1000m

Thanks, Papa. It makes sense to me now. I do believe that you are right!

 

[cheech10]

Tweetie_bird,

Well, I wrote last August, but I can answer a few of them.

3. Oxytocin is a peptide hormone, epinephrine is a modified Tyrosine residue, and cortisol is a steroid hormone.

4. You were right.

5. Virus, since it lives in the cell, has RNA transcripts, and is not affected by antibiotics.

Hope this helps a little.

 

[SDN]

Moving to the MCAT forum!

 

[LittleMD]

1. You had to use that rule of X^2 + XY + Y^2 = 1, where heterozygotes are XY. Thus, the answer was somewhere in the middle of the graph.

2. 1000m, same explanation as papa smurf.

3. oxytocin is the most like GH cuz its the only peptide listed,... epinephrine is derived from a single amino acid, tyrosine.

4. sound waves travelsfastest in solids, slowest in gases,... cuz its speed is proportional to the sq.rt. of the medium's resistance to compression

5. I chose protozoan, because it said it was a single cell, and i didn't think viruses were considered cells because they are not really living. can someone please refute or confirm this?

 

[Papa Smurf]

God, I'm an idiot!!!!! Why didn't I put oxytocin?!?!?! I knew that was a peptide hormone!!! For some reason, I was only thinking of the anterior pituitary hormones as peptide hormones though!!! Damn, that pisses me off! Ugh!

 

[Blitzkrieg]

Originally posted by Tweetie_bird:
[QB]****ty, just plain ****ty. What did y'all think about it? I can't believe how crappy that test was. All the stuff I studied....I might as well not have studied with the way the test was made. There would be no difference in scores.

Few quick things about specific questions:

1. The question about a gene increasing in frequency, and a chart was given. I believe the question was "when does the Heterozygote frequency increase most...." or something like that. I don't even remember what I picked, but what was the answer?

I put the middle of the hump..I think it was the 15th generation.

2. The thing about a parachute dropping something to a bunch of hikers on ground. The plane is going 100 m/s and is 500m above ground. What horizontal distance should they be away from the hikers to make sure that the package falls within their reach? I guessed--500m. What the hell was that?

guessed 1000, I think. (hope)

3. Insulin most likely looks like--oxytocin, epinephrine, cortisol and something else. I picked Epi b/c I assumed it was a peptide hormone and works through second messenger much like Epi. Is that even right?

Didnt have it

4. Why does something in water travel faster than in air? I picked the answer about how water molecules are closer together, and air molecules are further apart. Is that right?

Water closer together, yep..that one

5. The whole diarrhoea passage! EEK! Was that a bacteria or was it a virus?? I picked Parasitic Animal (b/c it lived in the villi of the intestines and replicated there..therefore, it was parasitic.) Also, the RNA transcript found in it....did it belong to the bacteria or a virus within it?? I picked the latter b/c when gene sequences were compared across different species of that bacteria, nothing was found in common. Therefore, it would have to be a virus. Plus, they said that cell wall antibiotics didn't work on it...which means resistance could be conferred upon the bacteria by the virus.
I hope I have this right.

Cryptosporidium was the organism: Let's look at it's characteristics:

Is an animal..http://vm.cfsan.fda.gov/~mow/chap24.html

ERRRRRRR....I got that wrong. What a damn trick. I thought it was a paramecium..I think that's what I put. The term animal threw me off...absolut stupid!

RNA transcript...put that it was from a virus. Why? Cos it was integrated into the crypto's genome (thus producing the protein), PLUS extracelluar..and the extracellular was promoted by the protein transcribed from the genome..A way viruses replicate.

 

[Elysium]

OK, can someone tell me what was going on with that damn sheep passage? They kept taking endocrine glands out of sheep...WTF? What did you guys put for the question that asked

"15 experimental fetal lambs were injected with cortisol. What will be the outcome vs. the control group?"

I sure as hell didn't know.

ANd what was up with that whole fish/buyoancy passage on the PS? Kinda random...

 

[Blitzkrieg]

•••quote:•••Originally posted by Elysium:
•OK, can someone tell me what was going on with that damn sheep passage? They kept taking endocrine glands out of sheep...WTF? What did you guys put for the question that asked

"15 experimental fetal lambs were injected with cortisol. What will be the outcome vs. the control group?"

I sure as hell didn't know.

ANd what was up with that whole fish/buyoancy passage on the PS? Kinda random...•••••actually, if I recall..

the lambs were injected with ACTH, which in turn stimulates cortisol production. Now, in the passage, it said that cortisol helps induce formtion of glucosanoids (sp), which in turn help induce labor. Therefore, the experimental lambs which recieved injections would ALL go into labor earlier than the control group.

cheers

 

[Papa Smurf]

•••quote:•••Originally posted by Blitzkrieg:
• •••quote:•••Originally posted by Elysium:
•OK, can someone tell me what was going on with that damn sheep passage? They kept taking endocrine glands out of sheep...WTF? What did you guys put for the question that asked

"15 experimental fetal lambs were injected with cortisol. What will be the outcome vs. the control group?"

I sure as hell didn't know.

ANd what was up with that whole fish/buyoancy passage on the PS? Kinda random...•••••actually, if I recall..

the lambs were injected with ACTH, which in turn stimulates cortisol production. Now, in the passage, it said that cortisol helps induce formtion of glucosanoids (sp), which in turn help induce labor. Therefore, the experimental lambs which recieved injections would ALL go into labor earlier than the control group.

cheers•••••Yeah, that's what I put. I'm praying that one of the many passages I f*ed up was the experimental passage in the section. The question about fish and bouyancy was just a physics concept. Buoyant force (F) = pgh where p equals density of the fluid. Was kinda arcane, but what else do you expect on the MCAT?

 

[Blitzkrieg]

ya..for the fish, I put that it depends on the density of the fluid AND the volume of water displaced by the fish..I knew it had to include density of fluid, and the other answer that included that also had "volume of water around fish", and that can't be right...ah...

Oh, and the forces acting against the fish when rising: gravity and drag from water, right?

BTW..what is this talk of "experimental passage"? I'm lost.

 

[Medical123]

This thread is actually making me feel a little better. I had form BH, but I had a lot of the same questions that you guys did and I am getting a lot of the same answers. Maybe we all did well !

 

[Medical123]

Oh, no! I looked up cryptosporidium and found out that it was a protozoan. Also, it is resistant to chlorine. Does anyone remember the question about where you would be least likely to find Cryptosporidium? I remember that chlorinated river water was one answer, but I don't remember the other choices. Looks like I totally bombed that question!

 

[Blitzkrieg]

•••quote:•••Originally posted by Medical123:
•Oh, no! I looked up cryptosporidium and found out that it was a protozoan. Also, it is resistant to chlorine. Does anyone remember the question about where you would be least likely to find Cryptosporidium? I remember that chlorinated river water was one answer, but I don't remember the other choices. Looks like I totally bombed that question! •••••crypto= animal= protozoan. look at that link I posted...

you wont find it in a DEEP well. Why?

a) chlorinated water: (they are resistant to chlorine, so it's good)
b) filtered river water (they get past filters)
c) surface river water (booooo..the passage said it was in 70-97% of world SURFACE water )
d) deep well..ding ding ding! you have a correct answer!

 

[Papa Smurf]

There's an experimental passage in each section. It's not included in the scoring. AAMC uses it to evaluate test questions.

 

[Blitzkrieg]

•••quote:•••Originally posted by Papa Smurf:
•There's an experimental passage in each section. It's not included in the scoring. AAMC uses it to evaluate test questions.•••••So..you're telling me...

if I get the exp passage correct, then I dont get credit for it? wtf! <img border="0" title="" alt="[Frown]" src="frown.gif" />

 

[Papa Smurf]

•••quote:•••Originally posted by Blitzkrieg:
• •••quote:•••Originally posted by Papa Smurf:
•There's an experimental passage in each section. It's not included in the scoring. AAMC uses it to evaluate test questions.•••••So..you're telling me...

if I get the exp passage correct, then I dont get credit for it? wtf! •••••Yeah, but if you bomb the passage, then it doesn't hurt you. Given the crazy topics on the BS section, I'm kinda glad that at least one of those passages isn't gonna count. :wink:

 

[Blitzkrieg]

•••quote:•••Originally posted by Papa Smurf:
• •••quote:•••Originally posted by Blitzkrieg:
• •••quote:•••Originally posted by Papa Smurf:
•There's an experimental passage in each section. It's not included in the scoring. AAMC uses it to evaluate test questions.•••••So..you're telling me...

if I get the exp passage correct, then I dont get credit for it? wtf! •••••Yeah, but if you bomb the passage, then it doesn't hurt you. Given the crazy topics on the BS section, I'm kinda glad that at least one of those passages isn't gonna count. :wink: •••••true..I bet it's either the lamb one or the immunology one with the 25 yr old man and 50 yr old woman...that immuno one was hard!

 

[Medical123]

Well, I sure hope that the experimental passage was either the lamb one or the immunology one. I really had to think about those.

 

[Papa Smurf]

•••quote:•••Originally posted by Blitzkrieg:
• •••quote:•••Originally posted by Papa Smurf:
• •••quote:•••Originally posted by Blitzkrieg:
• •••quote:•••Originally posted by Papa Smurf:
•There's an experimental passage in each section. It's not included in the scoring. AAMC uses it to evaluate test questions.•••••So..you're telling me...

if I get the exp passage correct, then I dont get credit for it? wtf! •••••Yeah, but if you bomb the passage, then it doesn't hurt you. Given the crazy topics on the BS section, I'm kinda glad that at least one of those passages isn't gonna count. :wink: •••••true..I bet it's either the lamb one or the immunology one with the 25 yr old man and 50 yr old woman...that immuno one was hard!•••••The immuno passage was pretty much reading comp and analyzing the data. It was still really tough, but the answers I did get right were because I went back and really dug into the passages and data tables. Hell, all I got under my belt is 2 bio classes so I definitely don't know much about humoral immunity, cell-mediated immunity, B & and T lymphocytes, etc. Still a very difficult passage. I thought that one passage with a question about XFRG's or whatever was insane. I came back to it at the end and guessed. Oh dwell.

 

[Blitzkrieg]

well..

I didnt have the XFRG one.

Some of those immuno ones couldn't be answered w/out outside info...and I'm weak on that. :-/

as papa said, oh dwell.

 

[Mish550]

Is there an experimental passage on all tests? And is there an experimental in every section of every test...or is it just random?

I had for AG, does anyone remember what they put for what the current conception about adult brain cells is? Can they be reproduced and are they replaceable?

 

[Blitzkrieg]

•••quote:•••Originally posted by Mish550:
•Is there an experimental passage on all tests? And is there an experimental in every section of every test...or is it just random?

I had for AG, does anyone remember what they put for what the current conception about adult brain cells is? Can they be reproduced and are they replaceable?•••••I had that question..

yes, they can..remember, the passage stated that : research has found that neurons in the gyrate CAN reproduce/replace themselves. It subsequently stated that it was *previously* thought that neurons could in fact not reproduce. Therefore, the research is regarded in the present tense, IE, current.

BTW, the rest of the passage talked about the addtion of that activator into the adult brain cells of mice, causing them to grow/reproduce.

This reminds me..

did anyone get the Down Syndrome/Alzheimers question? Wasn't it that familial Alzheimers has too much BD/A4 (due to mutation in a couple of amino acids at cleavage site), and that the Down Syn (due to extra chromosome) merely overproduces APP?

Also, the mice weren't good examples because they didnt lose memory/neurons, right?

 

[Papa Smurf]

•••quote:•••Originally posted by Mish550:
•Is there an experimental passage on all tests? And is there an experimental in every section of every test...or is it just random?

I had for AG, does anyone remember what they put for what the current conception about adult brain cells is? Can they be reproduced and are they replaceable?•••••I'm pretty sure there's at least one experimental passage in each section. Don't hold me to that.

As for the other question, wasn't the whole point of the passage that brain cells are reproducible with an injection of something. I can't remember, the details are really fuzzy now.

 

[Medical123]

•••quote:•••Originally posted by Blitzkrieg:

This reminds me..

did anyone get the Down Syndrome/Alzheimers question? Wasn't it that familial Alzheimers has too much BD/A4 (due to mutation in a couple of amino acids at cleavage site), and that the Down Syn (due to extra chromosome) merely overproduces APP?

Also, the mice weren't good examples because they didnt lose memory/neurons, right?[/QB]••••I vaguely remember the question about familial Alzheimers and it seems as if I put that down as my answer. I also put that APP is overproduced in Down Syndrome

 

[Papa Smurf]

•••quote:•••Originally posted by Blitzkrieg:
•
did anyone get the Down Syndrome/Alzheimers question? Wasn't it that familial Alzheimers has too much BD/A4 (due to mutation in a couple of amino acids at cleavage site), and that the Down Syn (due to extra chromosome) merely overproduces APP? •••••That's what I put. There was another answer that kinda went too far, so I didn't pick it.

• •••quote:•••
Also, the mice weren't good examples because they didnt lose memory/neurons, right?•••••I don't remember what I put for this, what were the other choices?

 

[Blitzkrieg]

•••quote:•••Originally posted by Papa Smurf:
• •••quote:•••Originally posted by Blitzkrieg:
•
did anyone get the Down Syndrome/Alzheimers question? Wasn't it that familial Alzheimers has too much BD/A4 (due to mutation in a couple of amino acids at cleavage site), and that the Down Syn (due to extra chromosome) merely overproduces APP? •••••That's what I put. There was another answer that kinda went too far, so I didn't pick it.

• •••quote:•••
Also, the mice weren't good examples because they didnt lose memory/neurons, right?•••••I don't remember what I put for this, what were the other choices?•••••ahh..dont remember the other choices. I just remembered thinking...well, why cant mice be a good model for human alzheimers? Alzheimers=loss of memory and neurons, and mice with extra plaque still dont lose memory and neurons. Ergo, Alzheimers in humans and mice dont experimentally mix =D

did that ring a bell? hehe..probably not.

 

[Blitzkrieg]

looking back, I can't think of ANY hard orgo on that whole BS section. What about y'all?

 

[Mish550]

What was the answer to the question that was: which of the following does not dissolve in NaOH, HCl, but does in AgNO3? Aslo, there was a question that asked you to predict the products based only if you took into account the bulkiness of the groups?

I can't think of anymore questions I have right now...but things keep popping in my mind, so I'm sure I'll be back with some more soon!

 

[Mish550]

What layer of the skin does leather come from? Is it the dermis or the epidermis?

Also, there was a question that was related to muscle contraction and talked about a problem where muscle contracts all at the same time and askes us what should be done to resolve this problem? Choices were like increase the threshold, inreease Na concentration, etc.....any idea??

 

[Papa Smurf]

•••quote:•••Originally posted by Mish550:
•What layer of the skin does leather come from? Is it the dermis or the epidermis?

Also, there was a question that was related to muscle contraction and talked about a problem where muscle contracts all at the same time and askes us what should be done to resolve this problem? Choices were like increase the threshold, inreease Na concentration, etc.....any idea??•••••I think that the answer to that discrete question about leather and the layer of skin it comes from was actually given in the discrete question right below it about the arector pili muscle. I put dermis coz the question was asking for connective tissue, right?

And for the other question, I put increase threshold potential, b/c that would make it more difficult for the muscle to contract as frequently. (Sort of like raising the bar on a bunch of pole vaulters). haha, dumb analogy I know. Anyone?

 

[Blitzkrieg]

•••quote:•••Originally posted by Mish550:
•What was the answer to the question that was: which of the following does not dissolve in NaOH, HCl, but does in AgNO3? Aslo, there was a question that asked you to predict the products based only if you took into account the bulkiness of the groups?

I can't think of anymore questions I have right now...but things keep popping in my mind, so I'm sure I'll be back with some more soon!•••••it was either alkane or alkyl halide..I put alkane...

 

[Blitzkrieg]

•••quote:•••Originally posted by Mish550:
•What layer of the skin does leather come from? Is it the dermis or the epidermis?

Also, there was a question that was related to muscle contraction and talked about a problem where muscle contracts all at the same time and askes us what should be done to resolve this problem? Choices were like increase the threshold, inreease Na concentration, etc.....any idea??•••••talking about epilepsy..you would want to increase threshold..IE, make it harder to fire.

 

[A1phaZer0]

The question about the leather, it was dermis, I put hypodermis, dammit!

 

[RT]

Summary for BG:

1. Maximum heterozygotes: 15th generation

Considering all possible combinations of p and q, the frequency for maximum number of heterozygotes, 2pq, would be 0.5 for each allele. The graph indicates 0.5 is at 15th generation.

2. Horizontal distance for parachute dropping: 1000 m

3. Insulin looks like: oxytocin, peptide hormone

4. Wave travels faster in water than air: distance of molecules

5. Cryptosporidium is: single-celled protozoan
"Cryptosporidium (crip-toe-spor-ID-ee-um) is a protozoan, a single-celled parasite, that lives in the intestines of animals and people." (http://www.nal.usda.gov/wqic/cornell.html)

Additional Questions:

6. Cryptosporidium is least likely to be in: deep water

7. Down Syndrome/Alzheimer, too much BD/A4 because: overproduction of APP

8. Mice weren't good because: didn't lose memory/neurons

9. Epilepsy prevention: increase threshold

10. Leather comes from: dermis?

I forgot what I put, may be epidermis. Choices are: stratum granulosum, dermis, epidermis, hypodermis. I think it's mesoderm 'cause musculoskeletal system is mesodermal, which would be more likely to induce contraction, but mesoderm wasn't one of the choices, so I put epidermis.

It's not fun that I got #3, #5 and may be #10 wrong. I didn't know that oxytocin is a peptide hormone, so I chose epinephrine, a tyrosin derivative that activates target cells as a peptide hormone. #5: Darn, I selected "parasitic animal" 'cause it's not bacteria (from passage), not virus (it's alive). Protozoan? we know it's single-celled but that doesn't mean it's a protozoan, hmmm!.

There was a question regarding GYI? GYFs? + INS + INSReceptor something. It's the last one for that passage. I took a wild guess having no idea how to interpret what they're trying to get.

 

[calbears84]

i thought the question was which of the following dissolves in NaOH and HCl but form precipitate with AgNO3. did i read the question wrong :-(
i put alkyl halide cos it's not a base/acid so it doesn't dissolve in NaOH/HCl. and AgCl is the precipitate formed when added to AgNO3.

QUOTE]Originally posted by Blitzkrieg:
• •••quote:•••Originally posted by Mish550:
•What was the answer to the question that was: which of the following does not dissolve in NaOH, HCl, but does in AgNO3? Aslo, there was a question that asked you to predict the products based only if you took into account the bulkiness of the groups?

I can't think of anymore questions I have right now...but things keep popping in my mind, so I'm sure I'll be back with some more soon!•••••it was either alkane or alkyl halide..I put alkane...•[/QUOTE]

 

[Blitzkrieg]

dude, I'm not sure if it's alkane or alkyl halide..will check tomorrow when I get back to school (will look @ orgo book)

cheers,

blitz

 

[calbears84]

this is the question i stared at for 5 minutes:
why was the adrenal gland and pituitary gland removed instead of the hypothalmus?

 

[calbears84]

i stared at this one for 5 minutes too :-(
a person eats nothing but protein. what increase in the person's urine? iz either urea or amino acid.

 

[Mish550]

•••quote:•••Originally posted by calbears84:
•i stared at this one for 5 minutes too :-(
a person eats nothing but protein. what increase in the person's urine? iz either urea or amino acid.•••••I said the hypothalamus was not removed because it was harder to get to, but I wasn't sure about that one. Also, for the other question, I said amino acid, but i wasn't sure about urea either...

Is anyone else worried about verbal?? We had 2 10 question passages right in the middle. That slowed me down a little bit. I'm hoping for a big curve, but it seems most of you are more worried about the science sections!

I have a PS question. There was a question in form AG about what color clouds would be if they were made of water gas...was it blue? clear? cloudy white? or green?

 

[RT]

Calbears,

I think it's "precipitate in AgNO3." Addition of alkyl chloride would result in the formation of AgCl. I recall that there's another choice involving something similar to Alkyl-Br. AgBr would also precipitate, but since the solution contains Cl-, Alkyl-Cl seems to be the answer.

Eating protein would increase urea. Urea is among the by-products of protein catabolism.

I forgot the answer for the removal of pituitary/adrenal gland instead of hypothalamus. Pituitary and adrenal gland would relate more to ACTH and cortisol production. If there's negative feedback, it would act on those two glands, and not on the hypothalamus. What are some of the choices?

 

[RT]

•••quote:•••I have a PS question. There was a question in form AG about what color clouds would be if they were made of water gas...was it blue? clear? cloudy white? or green?••••I don't remember that our form has that question. We do have a passage explaining that the sky is blue because of water vapor.

 

[HerrDoktor]

I had form AT. Did anyone have the question that aks what would happen if sheeps have their peak cortisol production level during the day and monkeys at night ?? it was in the sheep brain mutilation passage btw.

 

[LittleMD]

Question,... why does it seem like a TON of us had form BG? Do you think this is good/bad,... considering the people on sdn are typically above avg. MCAT scorers?

Anyhow,... for that question with muscle contractions, what were the other options? All I remember is that I DIDN'T pick increase threshold because i thought that it is physically impossible to change such an intrinsic property as the threshold of membrane ion channels. i could be wrong tho.

Also, for the question regarding insulin-like growth factors, it was IGF-1, IGF-X, IGF-Y, and insulin. IGFX and IGFY were synthetic, so there are no endogenous receptors for them. however, IGF's in general can bind to either IGF receptors or insulin receptors to elicit a response, since IGFs and insulin have highly-conserved structures. I don't remember all the experimental situations, but i remember that IGFX and IGFY were not affected and continued to increase the response, whereas IGF stopped by a certain point. do you guys remember any of the questions for this psg?