Deck 23: Metabolism and Energy Production

Question 1

In order to enter the citric acid cycle, pyruvate is first converted to

A)citrate.
B)ethanol.
C)acetaldehyde.
D)acetyl CoA.
E)oxaloacetate.

Answer 1

acetyl CoA.

Question 2

participates in reactions that produce

A) ADP from ATP.
B) a C-C bond.
C) a group.
D) phosphorylation.
E) a bond.

Answer 2

a bond.

Question 3

Which of the three major stages of metabolism includes the citric acid cycle?

A)Stage one
B)Stage two
C)Stage three

Answer 3

Stage three

Question 4

11The citric acid cycle operates only under aerobic conditions because

A) oxygen is a reactant in the citric acid cycle.
B) oxygen is a product of the citric acid cycle.
C) is a product of the citric acid cycle.
D) the produced by the citric acid cycle can only be reduced by the electron transport.
E) the NADH and produced by the citric acid cycle can only be reoxidized by the electron transport chain.

Question 5

The transformation of citrate to isocitrate in the citric acid cycle requires a(n)________ reaction.

A)hydrolysis
B)decarboxylation
C)reduction
D)oxidation
E)dehydration-hydration

Question 6

Most of the energy released in the citric acid cycle is used to produce

A) carbon dioxide and water.
B) NADH and
C) acetyl CoA.
D) citric acid.
E) glucose.

Question 7

When oxygen is in plentiful supply in the cell, pyruvate is converted to

A)lactate.
B)glucose.
C)fructose.
D)CoA.
E)acetyl CoA.

Question 8

The citric acid cycle reaction that removes the first molecule is a(n)

A)combination.
B)reduction.
C)hydrolysis.
D)oxidative decarboxylation.
E)carbonylation.

Question 9

Which coenzyme is used in the following reaction?

A)
B) FAD
C)
D) NADH
E) FMN

Question 10

In the first reaction of the citric acid cycle,

A) NADH is produced.
B) acetyl CoA reacts with oxaloacetate to give citrate.
C) ATP is produced.
D) glucose becomes pyruvate.
E) pyruvate becomes

Question 11

Which of the following is the net reaction for one turn of the citric acid cycle?

A)
B)
C)
D)
E)

Question 12

The citric acid cycle is used in the oxidation of

A)carbohydrates only.
B)fatty acids only.
C)proteins only.
D)carbohydrates and fatty acids only.
E)carbohydrates, fatty acids, and proteins.

Question 13

Which coenzyme is used in the following reaction?

A)
B) FMN
C) FAD
D) NADH
E)

Question 14

FAD is a coenzyme which usually participates in

A) decarboxylation reactions.
B) oxidation of alcohols to aldehydes.
C) formation of carbon-carbon double bonds.
D) phosphorylation reactions.
E)

Question 15

The citric acid cycle takes place in the

A)cytoplasm.
B)cytosol.
C)mitochondria.
D)endoplasmic reticulum.
E)Golgi apparatus.

Question 16

Another name for the citric acid cycle is

A)glucolysis.
B)glycolysis.
C)electron transport.
D)the transamination pathway.
E)the tricarboxylic acid (TCA)cycle.

Question 17

Another name for the citric acid cycle is

A)glucose hydrolysis.
B)gluconeogenesis.
C)the Krebs cycle.
D)oxidative phosphorylation.
E)the chemiosmotic pump.

Question 18

During the first reaction in the citric acid cycle,

A)ATP is synthesized.
B)HS- CoA is released.
C)a decomposition occurs.
D)a decarboxylation occurs.
E)acetyl CoA is made.

Question 19

What coenzyme(s) is(are) used in the citric acid cycle?

A) FMN
B) FAD only
C)
D)
E)

Question 20

Which of the following compounds in the citric acid cycle undergoes oxidative decarboxylation?

A)succinate
B)succinyl CoA
C)fumarate
D)citrate
E)isocitrate

Question 21

The process which combines hydrogen ions and electrons from the coenzymes with oxygen to form water is called

A)reduction.
B)fermentation.
C)electron transport.
D)oxidation.
E)decomposition.

Question 22

In reaction 7 of the citric acid cycle, fumarate is converted to malate by a ________ reaction.

A)dehydrogenation
B)dehydration
C)hydration
D)hydrolysis
E)hydrogenation

Question 23

In the chemiosmotic model of oxidative phosphorylation, ATP is synthesized as

A) flows through ATP synthase.
B) electrons flow through ATP synthase.
C) flows through ATP synthase.
D) flows through ATP synthase.
E) flows through ATP synthase.

Question 24

In the oxidation of succinate to fumarate in the citric acid cycle, the coenzyme is

A) CoA.
B) NADH
C)
D) FAD.
E) acetyl CoA.

Question 25

One turn of the citric acid cycle produces

A) one
B) two
C) three
D) four
E) five

Question 26

The reduced coenzyme ________ provides 1.5 ATP via electron transport.

A)HS-CoA
B)acetyl CoA
C)FADH₂
D)NADH
E)NADPH

Question 27

In reaction 5 of the citric acid cycle, the hydrolysis of succinyl CoA, CoA is released as

A)
B)
C)
D)
E)

Question 28

The energy released during electron transport is used to produce

A)glucose.
B)citric acid.
C)NADH.
D)carbon dioxide.
E)ATP.

Question 29

One method of regulation of the citric acid cycle is

A)carbon dioxide production.
B)temperature control.
C)water concentration.
D)allosteric control.
E)osmosis.

Question 30

The GTP formed in reaction 5 of the citric acid cycle is used to make

A)oxygen.
B)carbon dioxide.
C)ATP.
D)water.
E)CoA.

Question 31

Cyanide ion and carbon monoxide inhibit

A)antibiotic activity.
B)CoA formation.
C)CoQ formation.
D)electron flow between cytochrome c and complex IV.
E)ATP production.

Question 32

In the third reaction of the citric acid cycle, is converted to

A)
B)
C) NAD.
D)
E) NAS^-

Question 33

The last reaction in the citric acid cycle converts malate to

A)fumarate.
B)succinate.
C)citrate.
D)oxaloacetate.
E)isocitrate.

Question 34

The components of electron transport do NOT include

A) Cyt c .
B) Complex III.
C) CoQ
D)
E) acetyl CoA.

Question 35

Under anaerobic conditions, there is a net production of ________ ATP during glycolysis.

A)zero
B)two
C)four
D)six
E)eight

Question 36

In electron transport, NADH and FADH₂ are used to provide

A)thiol groups.
B)oxygen.
C)electrons and hydrogen ions.
D)carbon atoms.
E)water and carbon dioxide.

Question 37

In electron transport, the synthesis of ATP from
is called

A) glycolysis.
B) hydrolysis.
C) isomerization.
D) oxidative phosphorylation.
E) fermentation.

Question 38

In electron transport, the three protein complexes (I, III, and IV)

A) act as proton pumps, which generate a proton gradient.
B) act as pumps, which generate a gradient.
C) transfer electrons from FAD to
D) act as electron pumps, which generate an electron gradient.
E) transfer electrons from

Question 39

In the chemiosmotic model, protons circulate through a protein complex called

A) Complex III.
B) ATP synthase.
C) FMN.
D) CoQ
E) Cyt c .

Question 40

In electron transport, the oxidized product from the reaction of is

A) FAD.
B)
C)
D) FADH.
E) CoQ

Question 41

Uncouplers of ATP synthase

A) transport through the inner mitochondrial membrane.
B) allow to bypass ATP synthase.
C) break down ATP synthase.
D) stop pumping into the intermembrane space.
E) bypass CoQ

Question 42

The complete oxidation of glucose produces ________ ATP molecules.

A)2
B)8
C)12
D)24
E)32

Question 43

Which is the best choice for the box labeled "Answer" in the illustration below?

A) oxidized carrier B
B)
C) energy
D) reduced carrier
E) carbon dioxide

Question 44

When combined with electron transport, one turn of the citric acid cycle produces ________ ATP.

A)2
B)14
C)12
D)10
E)24

Question 45

One example of an electron carrier in electron transport is

A) ATP.
B) coenzyme Q .
C) GTP.
D) citrate.
E) water.

Question 46

Overall, one turn of the citric acid cycle produces

A)two FADH₂ molecules.
B)three NADH molecules.
C)three CO₂ molecules.
D)6 ATP.
E)2 GTP.

Question 47

The compounds in electron transport that remove hydrogen ions and electrons from NADH are classified as

A)electron carriers.
B)osmotic carriers.
C)oxidative transporters.
D)citrates.
E)phosphorylators.

Question 48

Which of the following is NOT a possible product of pyruvate under anaerobic conditions?

A)
B) ethanol
C) lactate
D) fumarate

Question 49

In glycolysis, glucose produces 2 pyruvate ions and a total of ________ ATP molecules.

A)2
B)4
C)7
D)8
E)12

Question 50

In stage three of metabolism, the overall result is to release

A)glycogen and water.
B)lactate and acetyl CoA.
C)carbon dioxide and energy.
D)glucose and water.
E)lactate and glucose.

Question 51

What is the correct coefficient for ATP in the complete reaction of glucose?

A)6
B)32
C)24
D)18
E)12