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Postby kabuto » Fri Apr 14, 2006 4:49 am

1. Which is correct regarding catabolic pathway?

A. form complex molecule from simple molecule
B. supply ATP to anabolic pathway
C. endergonic reaction that degrade complex molecule to simple molecule
D. spontaneous and do not require enzyme
E. an example is forming glycogen from glucose

My answer: D

2. Which of the following thermodynamic changes occur when amino acid is converted to protein?

A. +deltaH, -deltaS, +deltaG
B. +deltaH, -deltaS, -deltaG
C. +deltaH, +deltaS, +deltaG
D. -deltaH, -deltaS, +deltaG
E. -deltaH, +deltaS, +deltaG

My answer: A

3. Choose the enzyme that displace electron from organic molecule during respiration?

A. decarboxylase
B. ATP synthase
C. Deaminase
D. Dehydrogenase
E. Phosphofructokinase

My answer: D

4. Starting from 1 molecule of acetyl CoA, the maximum number of ATP that can be generated from substrate level phosphorylation is

A. 1
B. 2
C. 11
D. 12
E. more than 20

My answer: D

5. Fermentation do not produce as much energy as aerobic respiration because

A. fermentation do not occur in specific membrane bound organelle
B. pyruvate can still be reduced to form energy
C. fermentation occur in mitochondria
D. during fermentation, ATP is generated by oxidative phosphorylation
E. NAD+ is regenerated during alcohol/lactate formation without going to electron transfer chain

My answer: E
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Postby 2810712 » Fri Apr 14, 2006 6:13 am

I've given a try-

1.A the definition of catabolism.
2. Ans. is other than B & E. IN the presence of GTP & all the process has -deltaG & the original AA to Prot reaction has been combined with the GTP hydrolysis as its individual deltaG is positive. MOre than that for deltaG to be positive u can't have -deltaH along with +deltaS. I'm seeing for more info.
3.D, same as u.
4.A, substrate level produces one per Acetyl-CoA...surely one of us is commiting a blunder!
5.B, seems to be the main cause...

Correct me whereever.

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Postby kiekyon » Fri Apr 14, 2006 11:49 am

2810712 wrote:I've given a try-

1.A the definition of catabolism.




catabolic=(Science: biochemistry) Of or pertaining to catabolism; as, catabolic processes, which give rise to substances (catastates) of decreasing complexity and increasing stability.
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Postby 2810712 » Sat Apr 15, 2006 2:03 pm

kiekyon wrote:
2810712 wrote:I've given a try-

1.A the definition of catabolism.




catabolic=(Science: biochemistry) Of or pertaining to catabolism; as, catabolic processes, which give rise to substances (catastates) of decreasing complexity and increasing stability.


help me , i'm a bit confused here.
sugar formation is catabolism, so my ans is correct no?

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Postby mith » Sat Apr 15, 2006 6:43 pm

No...the answer would be C. complex->simple such as when proteins are converted to aminos.
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Postby kiekyon » Sun Apr 16, 2006 1:17 pm

mithrilhack wrote:No...the answer would be C. complex->simple such as when proteins are converted to aminos.


that is correct but note that the full sentence for c says

endergonic reaction that degrade complex molecule to simple molecule

that is wrong :x
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Postby kiekyon » Sun Apr 16, 2006 1:23 pm

for Q2

deltaG = delta H -T delta S

when amino acid is converted to protein,
delta G increase because this is anabolic reaction,
so, delta H increase and delta S decrease

Q4 produce 1 atp

Q5 b
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Postby mith » Sun Apr 16, 2006 2:35 pm

ooh gotcha :)
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Postby 2810712 » Tue Apr 18, 2006 3:21 pm

OH! sugar formation isn't catabolism, sorry but if the answer is see then no catabolic process[ eg. respiration reactions] should require enzymes...they are spontaneous, but they still require enzymes to achieve the time deadline.


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Postby kabuto » Wed Apr 19, 2006 3:11 am

so, only B is left,

catabolic pathway
B. supply ATP to anabolic pathway

am i right? :roll:
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Postby 2810712 » Wed Apr 19, 2006 2:49 pm

I see both A & C correct! Please tell me what is wrong with A?
:roll:





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Postby kiekyon » Fri Apr 21, 2006 8:49 am

it's the other way round.
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