Question

What stage of respiration immediately follows the process depicted below?

A) Electron transport chain
B) Glycolysis
C) Fermentation
D) Krebs cycle

Answer 1

I would suggest looking up the start and end points of the different stages of cellular respiration.

Answer 2

I know the stages are 1) Glycolysis, 2) Krebs Cycle, and 3) the Electron Transport Chain (ETC). But what stage is the image of?

Answer 3

That's not what I said. Look at the start and end points. Glucose is fed into glycolysis and you get a particular organic molecule out at the end. Do you know what type of molecule goes into the Krebs Cycle?

Answer 4

OHH i know! the picture is of the conversion of pyruvate to acetyl CoA

Answer 5

Yes, it is. And what happens to Acetyl-CoA?

Answer 6

Acetyl-CoA combines with a four-carbon compound, forming a six-carbon compound and releasing CoA... right?

Answer 7

Yes, and then it goes through a series of other reactions called the...... ?

Answer 8

i dont know...

Answer 9

wait is it the Krebs Cycle?

Answer 10

Yep! It's also known as the citric acid cycle because the 6 carbon compound that you mentioned is called citrate:

http://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Citric_acid_cycle_with_aconitate_2.svg/754px-Citric_acid_cycle_with_aconitate_2.svg.png

Answer 11

thankyou soooo much!!!

Answer 12

No problem :)