1. Hey Guest! Check out the 3 MCAT Study Plan Options listed in the 'stickies' area at the top of the forums (BoomBoom, SN2ed, and MCATJelly). Let us know which you like best.

    Also, we now offer a MCAT Test-Prep Exhibitions Forum where you can ask questions directly from the test-prep services.
    Dismiss Notice
  2. Dismiss Notice
  3. Download free Tapatalk for iPhone or Tapatalk for Android for your phone and follow the SDN forums with push notifications.
    Dismiss Notice
Dismiss Notice
Visit Interview Feedback to view and submit interview information.

MCAT Form CT what's an astrocyte? and more!

Discussion in 'MCAT Discussions' started by Premed2003, Apr 20, 2002.

  1. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    I had form CT, and one of the answer choices was astrocyte. Does anyone remember this question? Do you know what the answer was? I think it was "which is least likely" so I chose astrocyte since it sounded like it was an astronomy answer!

    And another question was something like ATP is part of a. b. c. ogliosaccharides d. something else. I don't even remember what I chose, but I don't think I did ogliosaccharides. Does anyone know which was the right answer?

    And muscles contract--does Z get shorter? Or actin, myosin, or both actin and myosin get shorter?

    There was an orgo passage where it referred to 2a and 2b and 3a and 3b but it only showed 2 and 3 so I assume that they were referring to enantiomers? Am I right? and 5a and 5b were enantiomers? So in that question where it said which were conformational isomers, was it 4a and 3a, or something like that?

    Thanks! I hope I guessed right!!! <img border="0" alt="[Clappy]" title="" src="graemlins/clappy.gif" />

    Oh and the first passage there was a question with c. no ERGs or whatever that was, and d. no estrogen receptor. I put c, is this right? I hope!
     
  2. Note: SDN Members do not see this ad.

  3. Mossjoh

    Mossjoh Mayo Clinic-PGY2
    10+ Year Member

    Joined:
    Jan 1, 2001
    Messages:
    529
    Likes Received:
    0
    Okay..I'll try to answer a few questions for you. Astrocytes are cells located in the brain that put the myelin sheath around the neurons in the CNS. In the PNS, the Schwann cells do this function. So..yes..astrocytes do exist and are actually pretty important.

    ATP is adenosine tri phosphate, basically its a adenine attached to a ribose, then on the #5 carbon of the ribose is attached 3 phosphate groups. So, base sugar, 3 phosphates.

    When muscles contract, neither actin or myosin get shorter..or decrease in length. The just move along each other via a reaction with ATP and the conformation change in the myosin heads.
    I can't remember which line decreases in length.
     
  4. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Thanks so much.

    The question had something to do with the structural importance of ATP. It said something like ATP is important for energy, but also for the structure of a) b) c) d). Do you know what it could be?
    I think c) was glyco something and d) was oligosaccharides
    woohoo! since myosin and actin don't shrink then I got it right !!! woohoo!

    Thanks!!
     
  5. leorl

    Physician Moderator Emeritus Lifetime Donor Classifieds Approved 10+ Year Member

    Joined:
    Jan 2, 2001
    Messages:
    5,559
    Likes Received:
    12
    Status:
    Attending Physician
    On that note, what the hell is a vole? Like, I guessed right...it was a rodent-like mouse thing. But I do not know when or where I am supposed to have come across "vole" except maybe in the ecology chapter which I definitely didn't review for the MCAT, nor have I seen in 5 years! Voles. Pffff.
     
  6. Mr.D

    Mr.D insipidus maximus
    7+ Year Member

    Joined:
    Jan 23, 2002
    Messages:
    259
    Likes Received:
    0
    Status:
    Medical Student
    The H-zone and I-band decrease in length during muscle contraction (ie, when the thick and thin filaments slide past each other using the energy of ATP hydrolysis), the A and Z-bands remain constant.
     
  7. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    I don't remember a vole on CT. Was it on form CT?

    I hope not because if it was I didn't see it :-(
     
  8. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    H and I weren't a choice, so I'm not sure...
    it was
    a) myosin
    b) actin
    c) both myosin and actin
    d) Z lines

    What do you think would be right?

    Thanks!
     
  9. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Oh yeah, and what about that question in PS where you had to decide the pH of a solution that made methyl violet turn violet and methyl red turn red. Was it ph less than 1 or ph between 3-5? I put less than 1?? I hope that was right
     
  10. Kritenoel

    Kritenoel Smile and Wave
    7+ Year Member

    Joined:
    Mar 25, 2002
    Messages:
    213
    Likes Received:
    0
    another question that was on CT - the whole thing with the marathon runners. I couldn't figure out what the trend between the decreasing lac. dehydrogenase was (it said something had to increase for it to decrease, and I could not for the life of me see a pattern!).
     
  11. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    oh yeah, me too!
    I put the dehydrogenase enzyme because since I couldn't find a trend I thought maybe it's just that the enzyme breaks it down.

    What do you guys think? Was this the right logic? I hope!!
     
  12. Sm00th13

    Sm00th13 Senior Member
    7+ Year Member

    Joined:
    Jun 29, 2001
    Messages:
    261
    Likes Received:
    0
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Premed2003:
    <strong>H and I weren't a choice, so I'm not sure...
    it was
    a) myosin
    b) actin
    c) both myosin and actin
    d) Z lines

    What do you think would be right?

    Thanks!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The answer should be "D" b/c Z-line defines the sacromere unit decreases. Both the mysoin and actin stay the same length as they slide over during a muscle contraction. I thought this was a simple giveme point. :cool:
     
  13. CaliBoy

    CaliBoy Senior Member
    7+ Year Member

    Joined:
    Feb 19, 2002
    Messages:
    212
    Likes Received:
    0
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Premed2003:
    <strong>H and I weren't a choice, so I'm not sure...
    it was
    a) myosin
    b) actin
    c) both myosin and actin
    d) Z lines

    What do you think would be right?

    Thanks!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I agree with aesculapian. None of those shorten during contraction, so the question might have been worded differently

    edit: Z-lines don't shorten during contraction, but adjacent Z-lines move closer together. Maybe that's what the question was really asking
     
  14. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    WoOHOO I got it right.
    YAY.
     
  15. Legend

    Legend Super Senior Member
    10+ Year Member

    Joined:
    Mar 29, 2001
    Messages:
    860
    Likes Received:
    1
    Status:
    Attending Physician
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by leorl:
    <strong>On that note, what the hell is a vole? Like, I guessed right...it was a rodent-like mouse thing. But I do not know when or where I am supposed to have come across "vole" except maybe in the ecology chapter which I definitely didn't review for the MCAT, nor have I seen in 5 years! Voles. Pffff.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Damn... I put 'snake'.

    Man.... English is not my first language.
    I have never heard of that word.
     
  16. Ice Man

    Ice Man Member
    7+ Year Member

    Joined:
    Apr 15, 2002
    Messages:
    46
    Likes Received:
    0
    Yeah, none of those shorten in muscle contaction.... weird. Also, astrocytes are scar formers in the CNS (they also regulate potassium). Oligodendricytes make the myelin in the CNS.
     
  17. Sm00th13

    Sm00th13 Senior Member
    7+ Year Member

    Joined:
    Jun 29, 2001
    Messages:
    261
    Likes Received:
    0
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by aesculapian:
    <strong>The H-zone and I-band decrease in length during muscle contraction (ie, when the thick and thin filaments slide past each other using the energy of ATP hydrolysis), the A and Z-bands remain constant.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I believe all ATP is needed for is to release the myosin head off from its binding site on actin. ATP does not cause the two filaments to slide pass each other. Once ATP is available it will allow myosin to unbind from it's binding site on the actin. That's why rit mortitis (spell wrong) occurs during death b/c no ATP is available causing the myosin-actin binding to hold (of course if you add ATP, the binding will undo itself) .
     
  18. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Thanks Daffy,
    Oh no :-( I don't think I picked DNA. Why is it DNA?

    Thanks!!
     
  19. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    I'm just remembering some more questions. There was one about proteins. I forget the exact question, but I remember one of the answers was peptide. Does anyone remember this question? I picked a) peptide. I hope I'm right?

    Also, the Pb fills what orbital by Aufbau? I think it was p, but now I think I might have put d instead. I think I put the wrong one, thinking it was p and wrote d. but I hope not.

    Does anyone else remember some questions? I hope we guessed right on the tough ones! <img border="0" alt="[Clappy]" title="" src="graemlins/clappy.gif" />
     
  20. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Oh, for that question about the kidney and was it the marathon runners? The choices were glomerulus and loops of henle and 2 others. I put glomerulus. Was I right? I hope!
     
  21. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Oh, for that question about the kidney and was it the marathon runners? The choices were glomerulus and loops of henle and 2 others. I put glomerulus. Was I right? I hope!
     
  22. Forensic Chick

    10+ Year Member

    Joined:
    Jan 29, 2002
    Messages:
    380
    Likes Received:
    0
    Status:
    Pre-Medical
    Your test sounds a lot harder than mine was. All of the stuff that I had no clue as to what it was (or how to say it) was explained in a passage. I guess I lucked out with form FH!
     
  23. Resident Alien

    7+ Year Member

    Joined:
    Jul 21, 2001
    Messages:
    1,041
    Likes Received:
    3
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Mossjoh:
    <strong>Okay..I'll try to answer a few questions for you. Astrocytes are cells located in the brain that put the myelin sheath around the neurons in the CNS. In the PNS, the Schwann cells do this function. So..yes..astrocytes do exist and are actually pretty important.
    </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I beg to differ with you, Mossjoh. Astrocytes assist in neuronal transport (by controlling neurotransmitter release), not laying down myelin. Unless astrocyte = oligodendrocyte (which i dont think), they are not the same functionally as Schwann cells.
     
  24. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    I remembered the kidney question. A patient has large proteins in their urine and is hypertensive. What isn't working right?
    c) glomerulus
    d) loop of henle

    Which was it?
    Thanks!
     
  25. Sm00th13

    Sm00th13 Senior Member
    7+ Year Member

    Joined:
    Jun 29, 2001
    Messages:
    261
    Likes Received:
    0
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Premed2003:
    <strong>I remembered the kidney question. A patient has large proteins in their urine and is hypertensive. What isn't working right?
    c) glomerulus
    d) loop of henle

    Which was it?
    Thanks!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">i believe the answer was c b/c at that point things are selectively filtered at near the glomerulus. This form wasn't too bad, I've heard worst over at EK forum. :cool: :cool:
     
  26. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Woohoo!! YAY <img border="0" alt="[Clappy]" title="" src="graemlins/clappy.gif" />
     
  27. Cobragirl

    Cobragirl Hoohaa helper ;)
    10+ Year Member

    Joined:
    Aug 18, 2000
    Messages:
    1,301
    Likes Received:
    2
    Status:
    Resident [Any Field]
    Just for the record:

    Within the CNS, ALL of the connective tissue consists of GLIA with the exception of the fibrous connective tissue that forms the coverings around the CNS (the 3 meninges). The glial tissue contains ASTROCYTES, oligodendrdrocytes, microglia & ependymal cells (a type of epithelium).

    Astrocytes come in 2 flavors:
    1)Protoplasmic (in the gray matter)
    2)Fibrous (in the white matter)

    They provide support scaffolding for the CNS & blood brain barrier endfeet on vessels and meninges. They function AS the extracellur space of the CNS and contol ionic balance in addition to scavenging and binding "spent" neurotransmitter molecules (remember, neurotransmitter is released into an "open" space, the synaptic cleft.) They modulate neuronal metabolism and polarization (by allowing molecules in/out of neuron).

    They do NOT control neurotransmitter release (except by regulation of ions coming and going...but that's regulation, not the actual MECHANISM of NT release), and they are NOT the same as Schwann cells. Schwann cells secrete myelin (among other jobs) in the PNS, and their counterparts in the CNS are the oligodendrites.

    But you guys will know all this stuff by this time next year! <img border="0" title="" alt="[Wink]" src="wink.gif" /> :D

    Hope this helps and good luck!!!! <img border="0" alt="[Clappy]" title="" src="graemlins/clappy.gif" />
     
  28. Papa Smurf

    Papa Smurf Thug 4 Life
    7+ Year Member

    Joined:
    Feb 9, 2002
    Messages:
    1,903
    Likes Received:
    2
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Cobragirl:
    <strong>Just for the record:

    Within the CNS, ALL of the connective tissue consists of GLIA with the exception of the fibrous connective tissue that forms the coverings around the CNS (the 3 meninges). The glial tissue contains ASTROCYTES, oligodendrites, microglia & ependymal cells (a type of epithelium).

    Astrocytes come in 2 flavors:
    1)Protoplasmic (in the gray matter)
    2)Fibrous (in the white matter)

    They provide support scaffolding for the CNS & blood brain barrier endfeet on vessels and meninges. They function AS the extracellur space of the CNS and contol ionic balance in addition to scavenging and binding "spent" neurotransmitter molecules (remember, neurotransmitter is released into an "open" space, the synaptic cleft.) They modulate neuronal metabolism and polarization (by allowing molecules in/out of neuron).

    They do NOT control neurotransmitter release (except by regulation of ions coming and going...but that's regulation, not the actual MECHANISM of NT release), and they are NOT the same as Schwann cells. Schwann cells secrete myelin (among other jobs) in the PNS, and their counterparts in the CNS are the oligodendrites.

    But you guys will know all this stuff by this time next year! <img border="0" title="" alt="[Wink]" src="wink.gif" /> :D

    Hope this helps and good luck!!!! <img border="0" alt="[Clappy]" title="" src="graemlins/clappy.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ah, to be a wise MS1 at UF! <img border="0" title="" alt="[Wink]" src="wink.gif" /> Haha, $20 says you'll probably forget half of that stuff before Step 1. Hell, I'd probably forget all of it. <img border="0" title="" alt="[Wink]" src="wink.gif" /> :D
     
  29. Sonya

    Sonya Senior Member
    10+ Year Member

    Joined:
    Aug 12, 2001
    Messages:
    893
    Likes Received:
    0
    Hi,

    I didn't take the MCAT, but here are a few answers

    Why DNA?
    DNA = deoxyribonucleic acid This identifies the DNA backbone.
    That meants it has a "deoxyribo" meaning a ribose-like sugar missing one oxygen.

    "Nucleic acid" is that it has nucleic acids in it. EG, the ATG&C A = adenosine.

    DNA also has phosphates.

    ATP = Adenosine tri phosphate.

    As we see, DNA has a adenosine bonded to phosphate -- Just like ATP.

    There are three types of glial cells.
    Astrocytes, oligodendrocytes, and schwann cells.

    Oligodendryocytes fight attack.
    Scwann cells lay down myelin.
    Astrocytes maintain the overall concentration and ionic balance.

    Astrocytes sound like astronomy b/c that's how they were named. If you looked at an astrocyte (especially under microscope), you might say it looked liked an astronomical feature, or a pattern of stars. This is because astrocytes need to be in all parts of the neuronal tissue, so they have to be very spread out.

    Hope this is helpful!
     
  30. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Oh, another question.
    Are blood cells made by the mesoderm?
    There was a question that said which is not made from the mesoderm?
    bone
    muscle
    blood cells
    something else

    I put blood cells. Am I right? I know it's not bone and muscle, but I wasn't sure if it was blood cells or d) something else that I don't remember
    Thanks!
     
  31. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Thanks everyone for the astrocyte explanation. I appreciate it!

    Does anyone who took test CT know what was the correct answer to that particular question?

    Thanks! <img border="0" alt="[Clappy]" title="" src="graemlins/clappy.gif" />
     
  32. Cobragirl

    Cobragirl Hoohaa helper ;)
    10+ Year Member

    Joined:
    Aug 18, 2000
    Messages:
    1,301
    Likes Received:
    2
    Status:
    Resident [Any Field]
    Papa, I've forgotten more this year than I learned in all of undergrad... <img border="0" title="" alt="[Wink]" src="wink.gif" />

    But I remember the stuff that counts... :D
     
  33. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Questions keep coming back to me
    What about that question for C13 with that structure where you had to say how many resonances for C13 and H's.
    I think I put 4 and 4. Was I right? I hope so! I counted wrong the first time and then counted again and got 4 and 4 so I hope I didn't make a careless mistake. Did anyone else put 4 and 4?

    Thanks! <img border="0" alt="[Clappy]" title="" src="graemlins/clappy.gif" />
     
  34. Medical123

    Medical123 Senior Member
    7+ Year Member

    Joined:
    Dec 4, 2001
    Messages:
    829
    Likes Received:
    2
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Premed2003:
    <strong>Oh, another question.
    Are blood cells made by the mesoderm?
    There was a question that said which is not made from the mesoderm?
    bone
    muscle
    blood cells
    something else

    I put blood cells. Am I right? I know it's not bone and muscle, but I wasn't sure if it was blood cells or d) something else that I don't remember
    Thanks!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I would guess that the answer would be blood cells.
     
  35. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Woohoo! Does everyone else think so too? I hope!
     
  36. Doctortobee

    Doctortobee Senior Member
    10+ Year Member

    Joined:
    Nov 24, 1999
    Messages:
    670
    Likes Received:
    1
    The something else was the brain
     
  37. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Oh no. I just looked it up and I think the right answer was brain :-( Oh man!
     
  38. Legend

    Legend Super Senior Member
    10+ Year Member

    Joined:
    Mar 29, 2001
    Messages:
    860
    Likes Received:
    1
    Status:
    Attending Physician
    I am also looking up every single question I got wrong, but what's the point ??? <img border="0" title="" alt="[Wink]" src="wink.gif" />

    There is nothing to be done about it...
    Our scores will stay the same !! :)
     
  39. Kritenoel

    Kritenoel Smile and Wave
    7+ Year Member

    Joined:
    Mar 25, 2002
    Messages:
    213
    Likes Received:
    0
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Legi:
    <strong>I am also looking up every single question I got wrong, but what's the point ??? <img border="0" title="" alt="[Wink]" src="wink.gif" />

    There is nothing to be done about it...
    Our scores will stay the same !! :) </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That's how I'm looking at it! I should probably stop looking at this thread - I had CT, and now I'm second guessing what I put and didn't put (not as though I can change it now!). I'm glad it's over, and just hope I did well enough to not have to take them again.
     
  40. Legend

    Legend Super Senior Member
    10+ Year Member

    Joined:
    Mar 29, 2001
    Messages:
    860
    Likes Received:
    1
    Status:
    Attending Physician
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Kritenoel:
    <strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Legi:
    <strong>I am also looking up every single question I got wrong, but what's the point ??? <img border="0" title="" alt="[Wink]" src="wink.gif" />

    There is nothing to be done about it...
    Our scores will stay the same !! :) </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That's how I'm looking at it! I should probably stop looking at this thread - I had CT, and now I'm second guessing what I put and didn't put (not as though I can change it now!). I'm glad it's over, and just hope I did well enough to not have to take them again.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">haha...
    I had form EH, but I keep thinking that I bubbled in EG instead....
     
  41. Green912

    10+ Year Member

    Joined:
    Jun 11, 2001
    Messages:
    724
    Likes Received:
    0
    Status:
    Attending Physician
    CNS= oligodendrocytes = myelin
    PNS= schwann cells = meylin
    Astrycotes = CNS, supportive, buffering & nutrients. <img border="0" title="" alt="[Wink]" src="wink.gif" />
     
  42. Neuronix

    Neuronix Total nerd
    Administrator Physician PhD Faculty SDN Advisor 10+ Year Member

    Joined:
    Mar 14, 2002
    Messages:
    12,627
    Likes Received:
    1,577
    Status:
    Attending Physician
    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Doctortobee:
    <strong>The something else was the brain</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The brain is definately ectoderm. Blood cells are made in bone marrow (I guess technically part of mesoderm), and bone and muscle are both mesoderm. Sorry :(

    Thanks developmental biology!
     
  43. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Oh, another question

    The virus becomes crystallized. What was the answer to that one? I don't remember what I put. What was that answer? <img border="0" title="" alt="[Frown]" src="frown.gif" />
     
  44. Lee

    Lee Sleestack
    Staff Member Administrator 10+ Year Member

    Joined:
    Dec 31, 1999
    Messages:
    11,199
    Likes Received:
    2,128
    MDApps:
    Status:
    Attending Physician
    Moving to MCAT forum. :)
     
  45. Premed2003

    Premed2003 Senior Member
    7+ Year Member

    Joined:
    Apr 19, 2002
    Messages:
    334
    Likes Received:
    1
    Oh, what was that question about papayas? I forget what it was about. Does anyone remember?
     
  46. MD/PhDApplicant

    MD/PhDApplicant Junior Member

    Joined:
    Apr 20, 2002
    Messages:
    8
    Likes Received:
    0
    I took the DK form in San Francisco.

    For the virus question, I answered that viruses have a defined geometry formed by the capsid proteins. The head of the virus has a unique geometric shape. Because the head has a defined geometry, I believe it can be crystallized and have crystallography performed on it.

    The papaya has an enzyme that was told to cleave myosin heads. Therefore, I believe the answer would be that the enzyme is used as a meat tenderizer. Meat is stiff since there is no ATP present and so the myosin heads cannot release from the actin filament. Using an enzyme that cleaves the myosin head will allow the sarcomere to relax. The other answer choices made no sense.
     

Share This Page