TCA Cycle – Section 1

11. Most multi-cellular organisms obtain energy for the synthesis of ATP during oxidative phosphorylation from

A. high energy phosphate compounds
B. a proton gradient across the inner mitochondrial membrane
C. a proton gradient across the cell membrane
D. a proton gradient across the outer mitochondrial membrane

Correct Answer: B. a proton gradient across the inner mitochondrial membrane

12. Standard redox potential for a substance is measured under the standard condition and is expressed as

A. milliAmpere
B. Volt
C. without unit
D. Ohm

Correct Answer: B. Volt

13. Most of the enzymes of the citric acid cycle in a eukaryotic cell are located in the

A. inner mitochondrial membrane
B. cytosol
C. mitochondrial matrix
D. intermembrane space

Correct Answer: B. cytosol

14. A positive redox potential means the substance has

A. lower affinity for electron
B. higher affinity for electron
C. lower affinity for proton
D. higher affinity for proton

Correct Answer: B. higher affinity for electron

15. The end product of glycolysis is pyruvate, which enters the citric acid cycle after being converted to

A. acetic acid
B. acetyl-CoA
C. acetaldehyde
D. none of these

Correct Answer: B. acetyl-CoA

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