Another question I do not understand?

Question

As a respiring organotroph consuming stored glucose, which of these processes makes ATP for it?

a) glycolysis

b) chemiosmosis

c) the Krebs cycle

d) all of the above.

The answer is d, but I do not understand why. Can't some respiring organotrophs use fermentation instead, which does not use chemiosmosis or the Krebs cycle?

Answer 1

You are correct, and your teacher or textbook sucks.  Sorry, but life ain't fair.

Answer 2

well it says a respiring organotroph so think of it as a human consuming glucose. First we have the anaerobic process (glycolysis) then aerobic process (chemiosmosis) which ends up making the most ATP when it's going through the electron transport chain. hope this helps a bit.  

Answer 3

Strictly speaking, glycolysis or fermentation is not respiration. Aerobic respiration is used by some bacteria to metabolize glucose using an electron acceptor other than oxygen: nitrate, sulfur, and sulfate.