2 Bio questions from 1990 Released DAT

[Comet208]

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I was practicing with an old DAT test and dont agree with 2 of the answer choices. So I am posting them to see what others might think and why.


The fetal and maternal blood normally are
1. mixed in the allantois
2. mixed in the maternal placenta
3. mixed in the amnion
4. mixed in the fetal part of the placents
5. never mixed


In an ecosystem
1. the energy captured by producers exceeds that captured by consumers
2. the biomass of consumers is usually greater than the biomass of the producers
3. the primary consumers are usually fungi
4. the third and fourth level consumers directly compete with each other
5. producers commonly feed upon consumers

 

[Flipper405]

I was practicing with an old DAT test and dont agree with 2 of the answer choices. So I am posting them to see what others might think and why.


The fetal and maternal blood normally are
1. mixed in the allantois
2. mixed in the maternal placenta
3. mixed in the amnion
4. mixed in the fetal part of the placents
5. never mixed

In an ecosystem
1. the energy captured by producers exceeds that captured by consumers
2. the biomass of consumers is usually greater than the biomass of the producers
3. the primary consumers are usually fungi
4. the third and fourth level consumers directly compete with each other
5. producers commonly feed upon consumers

First question -
Answer #5. We just covered this in bio a few days ago. The transfer is all through diffusion through the placenta apparently.

Second question -
Answer #1. A lot of energy is lost between trophic levels. This is why there are so few predators for a given area.

 

[mochafreak]

I'd say #1 is 5 and #2 is 1. What are the answers and how did you get an old DAT?

 

[fannian]

I was practicing with an old DAT test and dont agree with 2 of the answer choices. So I am posting them to see what others might think and why.


The fetal and maternal blood normally are
1. mixed in the allantois
2. mixed in the maternal placenta
3. mixed in the amnion
4. mixed in the fetal part of the placents
5. never mixed


In an ecosystem
1. the energy captured by producers exceeds that captured by consumers
2. the biomass of consumers is usually greater than the biomass of the producers
3. the primary consumers are usually fungi
4. the third and fourth level consumers directly compete with each other
5. producers commonly feed upon consumers

Do you really think we need to know Biology on this level of difficulty?

Thanks

 

[BenignDMD]

I was practicing with an old DAT test and dont agree with 2 of the answer choices. So I am posting them to see what others might think and why.


The fetal and maternal blood normally are
1. mixed in the allantois
2. mixed in the maternal placenta
3. mixed in the amnion
4. mixed in the fetal part of the placents
5. never mixed


In an ecosystem
1. the energy captured by producers exceeds that captured by consumers
2. the biomass of consumers is usually greater than the biomass of the producers
3. the primary consumers are usually fungi
4. the third and fourth level consumers directly compete with each other
5. producers commonly feed upon consumers

I dont think that their blood ever mixes....that is a bad thing

 

[Flipper405]

I dont think that their blood ever mixes....that is a bad thing

Why is that bad? 😕 It helps to protect the fetus, I think.


*edit* I just realized that you might be saying that mixing is a bad thing? If so, then... I agree! 😀

 

[Comet208]

Do you really think we need to know Biology on this level of difficulty?

Thanks

i wouldnt say difficult, but would say detail.

the answers given match the answer key.

i was always under the impression that the fetal and maternal blood are intimately mixed.

for the 2nd question, could choice 4 be also true??

i bought these from someone i knew. these are phtocopies of photocopies of photocopies of... . some Kaplan centers still have old released exams. thx all.

 

[BenignDMD]

Why is that bad? 😕 It helps to protect the fetus, I think.


*edit* I just realized that you might be saying that mixing is a bad thing? If so, then... I agree! 😀

😀 ya, thats what i was saying....that would not be healthy for their blood to mix 😀

 

[mochafreak]

If anyone has problems remembering whether the fetal/maternal blood is mixed, just think that the baby isn't necessarily the same blood type as the mother...think of the cross-rxn that would occur between the blood types...ugly.

 

[BenignDMD]

If anyone has problems remembering whether the fetal/maternal blood is mixed, just think that the baby isn't necessarily the same blood type as the mother...think of the cross-rxn that would occur between the blood types...ugly.

They did a study on rhesius (sp?) monkeys and mixing of baby and moms blood...I believe they injected moms blood into the fetus while still in the womb, most of the babys were spontaneously aborted

 

[Comet208]

If anyone has problems remembering whether the fetal/maternal blood is mixed, just think that the baby isn't necessarily the same blood type as the mother...think of the cross-rxn that would occur between the blood types...ugly.

very helpful... thank you.


when is your exam Mocha?

 

[I AM SARA]

😀 ya, thats what i was saying....that would not be healthy for their blood to mix 😀

of course they mix. can lead to eythroblastis fetalis or something to that effect if Rh- and Rh+ mix.

Duh.

 

[BenignDMD]

of course they mix. can lead to eythroblastis fetalis or something to that effect if Rh- and Rh+ mix.

Duh.

If you read the question:

The fetal and maternal blood normally are
1. mixed in the allantois
2. mixed in the maternal placenta
3. mixed in the amnion
4. mixed in the fetal part of the placents
5. never mixed

then you will understand what I wrote. It would not be healthy if they did mix

Understand???? 😱


DUH

 

[mochafreak]

very helpful... thank you.


when is your exam Mocha?

My exam is...someday. I'm trying to set a new record for number of times rescheduling the exam. OK, seriously, my exam is next Thursday. I will not delay it longer...I've run out July. 😀

 

[KSDDS]

of course they mix. can lead to eythroblastis fetalis or something to that effect if Rh- and Rh+ mix.

Duh.

The mother's circulatory system is NOT continuous circulation with the fetus's so they don't mix blood. Nutrients, oxygen and antibodies are transfered across the placenta, but no actualy blood cells are usually passed across this area. If the blood cells did cross, it could trigger an immune response and the mother's immune cells might attack and destroy the fetus. That is why they must be kept seperate.

On the second question, the answer is definitly number one. I don't hink third and fourth level consumers directly compete for the same food sources - the food they eat is what seperates a fourth level consumer from a third level consumer. There probably is some occasional competition, but answer number one is the most correct.

 

[dat_student]

My exam is...someday. I'm trying to set a new record for number of times rescheduling the exam. OK, seriously, my exam is next Thursday. I will not delay it longer...I've run out July. 😀

Mocha, if you reschedule it again I'll ask them to give you zeros.

 

[mochafreak]

Mocha, if you reschedule it again I'll ask them to give you zeros.

zeros with three's in front? 😀 It's a good thing they don't subtract a point from each section after every rescheduling, I think I'd be starting with a 25 by now.

 

[BenignDMD]

zeros with three's in front? 😀 It's a good thing they don't subtract a point from each section after every rescheduling, I think I'd be starting with a 25 by now.

i need some coffee....perhaps a mocha frappucino

 

[dat_student]

zeros with three's in front? 😀 It's a good thing they don't subtract a point from each section after every rescheduling, I think I'd be starting with a 25 by now.

Yes, zeros with 3s in front. You deserve 30s. I don't have your stamina. I can't study 12+ hours / day. I am 532% sure that you'll do fine. 😉

 

[mochafreak]

Yes, zeros with 3s in front. You deserve 30s. I don't have your stamina. I can't study 12+ hours / day. I am 532% sure that you'll do fine. 😉

I should do fine (except for QR maybe ), but fine isn't good enough...

I also need some coffee, hence my name, and a mocha frapp sounds quite good...uh oh I think I'm going to have to get one...need a change of scenery for ochem and bio. I remember the first time I ever had mocha whatever (cue cheesy music), I was really little and visiting my brother in another state. I had a mocha ice cream cone and I thought that I'd never get to have another one, because only that one ice cream store sold it...

 

[BenignDMD]

I should do fine (except for QR maybe ), but fine isn't good enough...

I also need some coffee, hence my name, and a mocha frapp sounds quite good...uh oh I think I'm going to have to get one...need a change of scenery for ochem and bio. I remember the first time I ever had mocha whatever (cue cheesy music), I was really little and visiting my brother in another state. I had a mocha ice cream cone and I thought that I'd never get to have another one, because only that one ice cream store sold it...

Thats funny, what would we do without SDN? Almost makes studying fun 🙄

 

[786mine]

Why is that bad? 😕 It helps to protect the fetus, I think.


*edit* I just realized that you might be saying that mixing is a bad thing? If so, then... I agree! 😀

simple. coz a mother who has HIV+, does not have a baby who has HIV. Only in some delivery cases, due to the dr. neglagence the baby gets HIV.

p.s. i don't think this is hard material. come on.

 

[Flipper405]

simple. coz a mother who has HIV+, does not have a baby who has HIV. Only in some delivery cases, due to the dr. neglagence the baby gets HIV.

p.s. i don't think this is hard material. come on.

I wasn't saying otherwise. I thought that he said the fact that the blood wasn't mixed was bad. I was the first to point out it doesn't mix. 🙂 Thanks anyway though.