A New Compound Isolated from Mitochondria Is Claimed to Represent

question 62

Multiple Choice

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?

• A)Alternate oxidation and reduction of the mitochondrion-bound coenzyme Z can be readily demonstrated.
• B)Removal of coenzyme Z from the mitochondria results in a decreased rate of oxygen consumption.
• C)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.
• D)The reduction potential of Z is between that of two compounds known to participate in the electron transport chain
• E)When added to a mitochondrial suspension,coenzyme Z is taken up very rapidly and specifically by the mitochondria.

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Definitions:

Cross-Over Point

The point at which two different strategies, actions, or processes result in the same outcome or cost, often used in analysis to decide between alternatives.

Variable Cost

Costs that vary directly with the level of production or sales volume, such as raw materials and direct labor costs.

Annual Demand

The total quantity of a product or service that is expected to be sold or used in one year.

Fixed Cost

Costs that remain consistent regardless of the amount of goods produced or sold, including expenses like rent, wages, and insurance premiums.