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Chapter 9: Practice Quiz

front 1

In alcohol fermentation, NAD+ is regenerated from NADH during which of the following?

back 1

reduction of acetaldehyde to ethanol (ethyl alcohol)

front 2

The direct products from the citric acid cycle are ________.

back 2

NOT final products of cellular respiration (work in progress)

front 3

Starting with citrate, which of the following combinations of products would result from three turns of the citric acid cycle?

back 3

3 ATP, 6 CO2, 9 NADH, and 3 FADH2

front 4

Chemiosmosis involves ________.

back 4

the movement of hydrogen ions across a membrane

front 5

The immediate energy source that drives ATP synthesis by ATP synthase during oxidative phosphorylation is

back 5

the H+ concentration gradient across the inner mitochondrial membrane.

front 6

What is the major physiological importance of breathing?

back 6

Oxygen must be present in our cells to break down food into energy.

front 7

Which of the following is a true distinction between fermentation and cellular respiration?

back 7

NADH is oxidized by the electron transport chain in respiration only.

front 8

Where are the enzymes of glycolysis located within the cell?

back 8

cytosol

front 9

Which kind of metabolic poison would most directly interfere with glycolysis?

back 9

an agent that closely mimics the structure of glucose but is not metabolized

front 10

What is the net energy yield for the anaerobic metabolism of one glucose molecule?

back 10

NOT two molecules of ATP and three NADH (work in progress)

front 11

In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of

back 11

ATP, CO2, and ethanol (ethyl alcohol)

front 12

Carbon skeletons for amino acid biosynthesis are supplied by intermediates of the citric acid cycle. Which intermediate would supply the carbon skeleton for synthesis of a five-carbon amino acid?

back 12

α-ketoglutarate

front 13

When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a hydrogen ion) the molecule becomes

back 13

reduced

front 14

Where are the proteins of the electron transport chain located?

back 14

mitochondrial inner membrane

front 15

During aerobic respiration, which of the following directly donates electrons to the electron transport chain at the lowest energy level?

back 15

FADH2

front 16

What role does O2 play in aerobic respiration?

back 16

It is the final electron acceptor at the end of the electron transport chain.

front 17

What is the definition of energy?

back 17

The capacity to do work

front 18

Where does glycolysis occur?

back 18

cytosol

front 19

Phosphofructokinase is an allosteric enzyme that catalyzes the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate, an early step of glycolysis. In the presence of oxygen, an increase in the amount ATP in a cell would be expected to

back 19

inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle.

front 20

The process of ________ utilizes an organic molecule to regenerate NAD+ from NADH.

back 20

Fermentation