A New Compound Isolated from Mitochondria Is Claimed to Represent

question 80

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.

---

Definitions:

Field Dependence/Independence

A cognitive style that describes individuals' tendency to rely on or disregard the surrounding context in processing information.

Reflectivity/Impulsivity

A cognitive style dimension referring to the way individuals trade off speed and accuracy of responding.

Working Memory

A cognitive system that holds information temporarily for processing and manipulation, crucial for reasoning and guidance of decision-making and behavior.

Older Adults

Individuals typically defined as being aged 65 years and older, often with considerations for their social, health, and cognitive changes.