Ch 7-3

Question 1

What is the primary process that drives ATP production in cellular respiration?

Answer 1

Oxidative phosphorylation

Question 2

What are the products of pyruvate oxidation?

Answer 2

Acetyl-CoA, CO2, and NADH.

Question 3

Where does the electron transport chain occur in eukaryotic cells?

Answer 3

Inner mitochondrial membrane

Question 4

What is the final electron acceptor in aerobic respiration?

Answer 4

Oxygen

Question 5

How many molecules of NADH are produced per turn of the citric acid cycle?

Answer 5

Three NADH molecules.

Question 6

What molecule shuttles electrons between complexes in the electron transport chain?

Answer 6

Ubiquinone (Coenzyme Q).

Question 7

What process follows the electron transport chain to generate ATP?

Answer 7

Chemiosmosis

Question 8

What is the total ATP yield per glucose molecule in cellular respiration?

Answer 8

30 to 32 ATP.

Question 9

What is the function of ATP synthase?

Answer 9

To synthesize ATP from ADP and inorganic phosphate using the proton gradient.

Question 10

What type of organisms use both fermentation and aerobic respiration depending on oxygen availability?

Answer 10

Facultative anaerobes

Question 11

t/f FADH2 generates more ATP than NADH during oxidative phosphorylation.

Answer 11

A: False (NADH generates more ATP).

Question 12

T/F : Proton pumping occurs in complexes I, III, and IV of the electron transport chain.

Answer 12

TRUE

Question 13

T/F: Ubiquinone is a protein that transports electrons between complexes in the electron transport chain.

Answer 13

False (Ubiquinone is not a protein).

Question 14

T/F = Anaerobic respiration produces more ATP than aerobic respiration.

Answer 14

False, (aerobic respiration produces more ATP)

Question 15

T/F : Oxidative phosphorylation requires oxygen to function.

Answer 15

True

Question 16

T/f ; The citric acid cycle produces ATP directly.

Answer 16

True (but only one ATP per cycle)

Question 17

T/F : Cytochrome proteins are involved in electron transport in the electron transport chain.

Answer 17

TRUE

Question 18

T/F: The chemiosmotic process is independent of the electron transport chain.

Answer 18

False (it depends on the electron transport chain to create the proton gradient).

Question 19

T/F: Complex II of the electron transport chain is a proton pump.

Answer 19

A: False (Complex II is not a proton pump).

Question 20

T/F: Facultative anaerobes can switch between fermentation and aerobic respiration.

Answer 20

TRUE

Question 21

What is the main role of NADH and FADH2 in cellular respiration?
(a) Energy storage (b) Electron carriers (c) Oxygen carriers

Answer 21

B) ELECTRON CARRIERS

Question 22

How many ATP are generated from one NADH during oxidative phosphorylation?
(a) 1.5 (b) 2.5 (c) 3.5

Answer 22

B) 2.5

Question 23

Which process creates the proton gradient used in chemiosmosis?
(a) Glycolysis
(b) Electron transport chain
(c) Citric acid cycle

Answer 23

B) ELECTRON TRANSPORT CHAIN

Question 24

What is the maximum number of ATP molecules produced per glucose molecule during aerobic respiration?
a) 32 (b) 24 (c) 18

Answer 24

A ) 32

Question 25

Where does pyruvate oxidation occur in eukaryotic cells? (a) Cytosol (b) Mitochondrial matrix (c) Intermembrane space

Answer 25

C) MITOCHONDRIAL MATRIX

Question 26

Which of the following is NOT a product of the citric acid cycle? (a) NADH (b) FADH2 (c) Oxygen

Answer 26

C) O2

Question 27

What is the function of the proton-motive force? (a) Drive the synthesis of ATP (b) Produce CO2 (c) Split glucose

Answer 27

A) DRIVE THE SYNTHESIS OF ATP

Question 28

How many ATP molecules are produced during glycolysis? (a) 2 (b) 4 (c) 8

Answer 28

A) 2 net atp

Question 29

What molecule is required to start the citric acid cycle? (a) Pyruvate (b) Acetyl-CoA (c) Glucose

Answer 29

B) acetyl-coa

Question 30

Which of the following is the first protein in the electron transport chain? (a) Cytochrome c (b) Flavoprotein (c) ATP synthase

Answer 30

B) flavoprotein

Question 31

What is the end product of chemiosmosis? (a) Oxygen (b) CO2 (c) ATP

Answer 31

C) ATP

Question 32

Where does anaerobic respiration typically occur? (a) Mitochondria (b) Cytoplasm (c) Nucleus

Answer 32

B) CYTOPLASM

Question 33

How does the proton gradient help ATP synthase? (a) Provides electrons (b) Powers ATP production (c) Breaks down glucose

Answer 33

B) powers ATP production

Question 34

Which electron carrier enters the electron transport chain at Complex II? (a) NADH (b) FADH2 (c) Cytochrome c

Answer 34

B) FADH2

Question 35

What is the function of cytochrome proteins in the electron transport chain? a) Act as electron carriers (b) Produce ATP (c) Pump protons

Answer 35

A) ACT AS ELECTRON CARRIERS

Question 36

How many protons are pumped into the intermembrane space by NADH? (a) 2 (b) 3 (c) 6

Answer 36

B) 3

Question 37

What is the final product of anaerobic respiration? (a) Oxygen (b) Lactic acid (c) Pyruvate

Answer 37

C) lactic acid

Question 38

Which complex in the electron transport chain does not pump protons? (a) Complex I (b) Complex II (c) Complex III

Answer 38

B) complex II

Question 39

Which molecule is an alternative electron acceptor in anaerobic respiration? (a) Sulfate (b) Oxygen (c) NADH

Answer 39

A) SULFATE

Question 40

Which process generates the most ATP in cellular respiration? (a) Glycolysis (b) Oxidative phosphorylation (c) Citric acid cycle

Answer 40

B) oxidative phosphorylation

Question 41

In which part of the mitochondrion does chemiosmosis occur? a) Matrix (b) Intermembrane space (c) Inner membrane

Answer 41

(c) Inner membrane

Question 42

Which of the following occurs first during cellular respiration? (a) Glycolysis (b) Citric acid cycle (c) Electron transport chain

Answer 42

A) glycolysis

Question 43

What is the function of Complex IV in the electron transport chain? a) Pump protons (b) Transfer electrons to oxygen (c) Produce ATP

Answer 43

B) transfer electrons to oxygen

Question 44

How does the electron transport chain create an electrochemical gradient? (a) By producing CO2 (b) By pumping protons across the membrane (c) By synthesizing glucose

Answer 44

B) by pumping protons across the membrane

Question 45

Which organisms cannot survive in the presence of oxygen? (a) Facultative anaerobes (b) Obligate anaerobes (c) Aerobic bacteria

Answer 45

B) obligate anaerobes

Question 46

Which electron carrier is reduced during glycolysis? a) FAD (b) NAD+ (c) Ubiquinone

Answer 46

B) NAD+

Question 47

What is the role of oxygen in cellular respiration? (a) ATP producer (b) Final electron acceptor (c) Enzyme

Answer 47

B) final electron acceptor

Question 48

Which process generates carbon dioxide during cellular respiration? (a) Glycolysis (b) Citric acid cycle (c) Chemiosmosis

Answer 48

B) citric acid cycle

Question 49

How many FADH2 molecules are produced per turn of the citric acid cycle? (a) 1 (b) 2 (c) 3

Answer 49

A) 1

Question 50

What happens to NADH in the electron transport chain? (a) It is oxidized (b) It is reduced (c) It is broken down

Answer 50

A) it is oxidized