Destroyer BIO #145

[Demps]

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On the bio section of destroyer #145 in 2011 edition,

the question reads:

Bacteria derive their energy from:

a) Krebs cycle
b) Glycolysis
c) Electron transport chain
d) A and B
e) B and C

According to the answer key, answer is D.

Based on the explanation, it should be E right? not D...

 

[KyoPhan]

Yes.

 

[Dental2000]

So is D right or E?

Im thinking D is right

 

[flyingforever]

Why E?

Glucogenic and ketogenic precursors feed into the Glycolysis and Kreb cycle pathways, so D is the correct answer.

 

[invictusx]

Why E?

Glucogenic and ketogenic precursors feed into the Glycolysis and Kreb cycle pathways, so D is the correct answer.

Someone took biochemistry 2.

 

[KyoPhan]

Wait, what?

They said the answer was D, but in their explanation, it suggest E. They say they do not have mitochondria to do TCA but they can carry out glycolysis and do ETC.

So shouldn't it be E?

 

[flyingforever]

Someone took biochemistry 2.

I took four semesters of Biochemistry 😀

 

[PooyaH]

What are you guys talking about? Bacteria don't have mitochondria to have Krebs Cycle!!! The do Glycolysis and Electron Transport Chain (which could be at multiple sites).

The answer should be E!

 

[KyoPhan]

I don't know how accurate this is but according to this site:
http://chemistry.about.com/od/biochemistry/ss/citricacidcycle.htm
"Many bacteria perform the citric acid cycle too, though they do not have mitochondria so the reactions take place in the cytoplasm of bacterial cells."

 

[flyingforever]

What are you guys talking about? Bacteria don't have mitochondria to have Krebs Cycle!!! The do Glycolysis and Electron Transport Chain (which could be at multiple sites).

The answer should be E!

ETC occurs in mitochondria as well?

 

[HornedFrog2013]

Don't bacteria do ETC in their cell wall?

 

[PooyaH]

ETC occurs in mitochondria as well?

Indeed.

Don't bacteria do ETC in their cell wall?

Yes.

 

[NewBee12]

I remember I went over this question right before my test and I wasn't sure so I asked my biochem professor and the answer is E