Chapter 7 - How Cells Release Chemical Energy

Question 1

Is the following statement true or false? Unlike animals which make ATP by aerobic respiration, plants make all their ATP by photosynthesis.

Answer 1

False (plants use aerobic respiration too)

Question 2

Glycolysis starts and ends in the _____________.

a. nucleus
b. mitochondrion
c. plasma membrane
d. cytoplasm

Answer 2

d. cytoplasm

Question 3

Which of the following metabolic pathways require(s) molecular oxygen (O2)?

a. aerobic respiration
b. lactate fermentation
c. alcoholic fermentation
d. all of the above

Answer 3

a. aerobic respiration

Question 4

Which molecule does not form during glycolysis?

a. NADH
b. pyruvate
c. FADH2
d. ATP

Answer 4

c. FADH2

Question 5

In eukaryotes, aerobic respiration is completed in the _________.

a. nucleus
b. mitochondrion
c. plasma membrane
d. cytoplasm

Answer 5

b. mitochondrion

Question 6

Which of the following reaction pathways is not part of the second stage of aerobic respiration?

a. electron transfer phosphorylation
b. acetyl–CoA formation
c. Krebs cycle
d. glycolysis
e. a and d

Answer 6

e. a and d

Question 7

After the Krebs reactions run through _________ cycle(s), One glucose molecule has been completely broken down to CO2.

a. one
b. two
c. three
d. six

Answer 7

b. two

Question 8

In the third stage of aerobic respiration, ___________ is the final acceptor of electrons.

a. water
b. hydrogen
c. oxygen
d. NADH

Answer 8

c. oxygen

Question 9

In alcoholic fermentation, ____________ is the final acceptor if electrons.

a. oxygen
b. pyruvate
c. acetaldehyde
d. sulfate

Answer 9

c. acetaldehyde

Question 10

Fermentation pathways make no more ATP beyond the small yield from glycolysis. The remaining reactions serve to regenerate ___________.

a. FAD
b. NAD+
c. glucose
d. oxygen

Answer 10

b. NAD+

Question 11

Most of the energy that is released by the full breakdown of glucose to CO2 and water ends up in _____________.

a. NADH
b. ATP
c. heat
d. electrons

Answer 11

c. heat

Question 12

Your body cells can use _________ as an alternative energy source when glucose is in short supply.

a. fatty acids
b. glycerol
c. amino acids
d. all of the above

Answer 12

d. all of the above

Question 13

Which of the following is not produced by an animal muscle operating under anaerobic conditions?

a. heat
b. pyruvate
c. NAD+
d. ATP
e. lactate
f. all are produced

Answer 13

f. all are produced

Question 14

Match the event with its most suitable description.

___ glycolysis
___ fermentation
___ Krebs cycle
___ electron transfer phosphorylation

a. ATP, NADH, FADH2, and CO2 form
b. glucose to pyruvate
c. NAD+ regenerated, Little ATP
d. H+ flows via ATP synthesis

Answer 14

Match the event with its most suitable description.

(b) glycolysis
(c) fermentation
(d) Krebs cycle
(a) electron transfer phosphorylation

a. ATP, NADH, FADH2, and CO2 form
b. glucose to pyruvate
c. NAD+ regenerated, Little ATP
d. H+ flows via ATP synthesis

Question 15

Match the term with the best description.

\_\_\_ matrix
\_\_\_ pyruvate 
\_\_\_ NAD+
\_\_\_ mitochondrion 
\_\_\_ intermembrane space
\_\_\_ NADH

a. needed for glycolysis
b. inner space
c. makes many ATP
d. end of glycolysis
e. reduced coenzyme
f. hydrogen ions accumulate here

Answer 15

Match the term with the best description.

(b) matrix
(d) pyruvate
(a) NAD+
(c) mitochondrion
(f) intermembrane space
(e) NADH

a. needed for glycolysis
b. inner space
c. makes many ATP
d. end of glycolysis
e. reduced coenzyme
f. hydrogen ions accumulate here