Question

a new compound isolated from mitochondria is claimed to represent a previously unrecognized carrier in the electron transfer chain. it is given the name coenzyme z. which line of evidence do you feel is the least conclusive in assigning this compound a position in the electron transfer chain? group of answer choices alternate oxidation and reduction of the mitochondrion-bound coenzyme z can be readily demonstrated. when added to a mitochondrial suspension, coenzyme z is taken up very rapidly and specifically by the mitochondria. removal of coenzyme z from the mitochondria results in a decreased rate of oxygen consumption. the reduction potential of z is between that of two compounds known to participate in the electron transport chain. the rate of oxidation and reduction of mitochondrion-bound coenzyme is of the same order of magnitude as the overall rate of electron transfer in mitochondria as measured by oxygen consumption.

Answer 1

The least conclusive evidence in placing coenzyme Z in the electron transport chain is its rapid uptake in mitochondrial suspension, as it does not demonstrate a direct function within the ETC.

Step-by-step explanation:

The line of evidence that is the least conclusive in assigning the new compound coenzyme Z a position in the electron transport chain (ETC) is that "when added to a mitochondrial suspension, coenzyme Z is taken up very rapidly and specifically by the mitochondria."

This evidence does not specifically indicate a role in electron transfer but just shows that the compound is associated with mitochondria.

It lacks a direct link to the function within the ETC, unlike other evidence such as alternate oxidation and reduction which demonstrates redox activity involved in electron transport, or the reduced oxygen consumption upon its removal, indicating a functional role in electron transfer.