a good bio question that could come up

[ksksks]

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Q. When glucose is oxidized to CO2 and water, approximately 40% of its energy is transferred to
a) Heat
b) ATP
c) Acetyl CoA
d) Water
e) The Citrate Cycle (Krebs Cycle)

 

[Lazerous]

Heat

 

[Dmitry Malayev]

I'm not too sure since bio isn't my best but i would assume it would be ATP since that would be the form of energy most of your body needs especially since the others make no sense like Heat, or Water. And CoEnzyme A which is a catalyst.

I would be stuck between B and E but i think i would put my answer as B) ATP.

 

[ksksks]

i shall post up the answer with explanation after i get at least 10 answers from people 🙂

 

[DDS13]

i would say since it is completely oxidized, 40 % is heat and the rest atp. i could be wrong

 

[Chesnok]

In classic style as I studied it's 50/50 ATP and heat; but since oxidation is not quite perfect process, 60% is heat for heating the body --which is also very important, and 40% of ATP then. Tricky q thou --wanted to put heat at first 😉

 

[ldm0208]

Most is lost as heat. But it's 40%, so I will go with ATP.

 

[Lazerous]

Most is lost as heat. But it's 40%, so I will go with ATP.

Oops, I mixed it up. Yes, it is mostly lost as heat and rest is ATP.

 

[ksksks]

Answer is C (Acetyl CoA)...Yeah I chose HEAT when i first solved it 🙄

ATP definitely cannot be the answer since energy itself can only be in the form of ATP.

Heat production is 60%, so if the question asked 60% instead, Heat would be the correct answer

It cannot be the Krebs cycle, because it does not specify a specific molecule that has its energy received. A cycle cannot receive energy, only the particular substance within.

Water can't be an answer because it is something that is produced from breakdown of glucose.

Acetyl CoA, therefore is the only remaining answer. Other possible answer could have been pyruvate as well.

 

[doc3232]

This probably couldn't come up IMO...seems too hard, I don't think anyone who has taken the DAT claim that they had numbers on their test...
That is just my opinion though...I might be wrong.

 

[ldm0208]

Answer is C (Acetyl CoA)...Yeah I chose HEAT when i first solved it 🙄

ATP definitely cannot be the answer since energy itself can only be in the form of ATP.

Are you sure about this? If you can, can you give me the reference you found this problem with an explanation??

I searched and found this "During respiration,glucose is completely oxidized to carbon dioxide. Step-wise redox reactions release a substantial amount of energy for ATP synthesis. Overall, approximately 40% of the energy released from glucose is captured as ATP, and the rest is lost as heat."

http://www.factbg.hit.bg/biology.htm

 

[Lazerous]

Answer is C (Acetyl CoA)...Yeah I chose HEAT when i first solved it 🙄

ATP definitely cannot be the answer since energy itself can only be in the form of ATP.

Heat production is 60%, so if the question asked 60% instead, Heat would be the correct answer

Exactly! The original question is saying "energy is transferred to" it doesn't necessarily say that it is 'absorbed' or 'released', simply transferred.

And since ATP is a high energy molecule, that means that whatever energy isn't lost as heat is transferred to ATP.