Ch 7-1

Question 1

What is the main goal of cellular respiration

Answer 1

To generate ATP from the energy released during electron transfers

Question 2

What are the 2 types of cellular respirationo

Answer 2

Aerobic and anaerobic

Question 3

What molecule is the final electron acceptor in aerobic respiration

Answer 3

O2

Question 4

What happens to glucose during cellular respiration

Answer 4

It is oxidized, and oxygen is reduced

Question 5

Which coenzyme acts as an electron carrier in cellular respiration

Answer 5

NAD+ (nicotinamide adenine dinucleotide)

Question 6

What is the name of the process where glucose is split into two pyruvate molecules

Answer 6

Glycolysis

Question 7

What is the name of the process where glucose is split into two pyruvate molecules

Answer 7

Glycolysis

Question 8

Where does glycolysis occur in the cell

Answer 8

In the cytosol

Question 9

How many atp molecules are produced in cellular respiration per glucose molecule

Answer 9

32 atp molecules

Question 10

What is the reducing agent in redox rxn

Answer 10

The electron donor

Question 11

What is the substrate level phosphorylation

Answer 11

Transfer of a phosphate group from a substrate to ADP to form ATP.

Question 12

What enzyme catalyzes the removal of hydrogen from glucose?

Answer 12

Dehydrogenase

Question 13

What is the first stage of cellular respiration?

Answer 13

Glycolysis

Question 14

What happens during pyruvate oxidation?

Answer 14

Pyruvate is converted into Acetyl-CoA, releasing CO₂ and producing NADH.

Question 15

What role does oxygen play in the electron transport chain?

Answer 15

It pulls electrons down the chain due to its high electronegativity.

Question 16

How is NADH formed during glycolysis?

Answer 16

Through the transfer of electrons from glucose to NAD+.

Question 17

T/F: Glycolysis can occur both in the presence and absence of oxygen.

Answer 17

True

Question 18

T/F: Anaerobic respiration is more efficient than aerobic respiration.

Answer 18

F

Question 19

T/F: ATP is the final product of oxidative phosphorylation.

Answer 19

True

Question 20

T/F: NAD+ acts as a reducing agent in cellular respiration.

Answer 20

A: False (it acts as an oxidizing agent).

Question 21

T/F: Electrons lose potential energy during the transfer from glucose to oxygen

Answer 21

True

Question 22

T/F: Glycolysis is the only part of cellular respiration that occurs in the mitochondria.

Answer 22

False (it occurs in the cytosol).

Question 23

T/F: The Citric Acid Cycle is also known as the Krebs Cycle.

Answer 23

True

Question 24

T/F: NADH directly transfers electrons to oxygen in the electron transport chain.

Answer 24

False (it transfers electrons to a series of carriers).

Question 25

T/F: Oxidation involves the gain of electrons.

Answer 25

False (oxidation is the loss of electrons).

Question 26

T/F: The energy investment phase of glycolysis requires ATP

Answer 26

T

Question 27

T/F: NADH is an oxidized form of the electron carrier.

Answer 27

A: False (NADH is the reduced form).

Question 28

T/F: Pyruvate is the end product of glycolysis.

Answer 28

True

Question 29

T/F: In the absence of oxygen, glycolysis is the only pathway cells can use to generate ATP.

Answer 29

True

Question 30

T/F: Aerobic respiration only uses carbohydrates as fuel.

Answer 30

False (it can also use lipids and proteins).

Question 31

T/F: The energy released from redox reactions is used to synthesize ATP.

Answer 31

True

Question 32

During glycolysis, glucose is split into two molecules of: (a) ATP, (b) Pyruvate, (c) Oxygen

Answer 32

B ) Pyruvate

Question 33

What molecule stores energy as electrons in cellular respiration? (a) NADH, (b) ATP, (c) Oxygen

Answer 33

A) NADH

Question 34

What is the total potential energy from one molecule of glucose? (a) 686 kcal/mol, (b) 32 kcal/mol, (c) 7.3 kcal/mol

Answer 34

A) 686 kcal/mol

Question 35

What is removed from glucose during cellular respiration? (a) Carbon, (b) Electrons, (c) Water

Answer 35

B) electrons

Question 36

How many steps are involved in glycolysis? (a) 5, (b) 10, (c) 20

Answer 36

B) 10

Question 37

What enzyme converts DHAP to G3P in glycolysis? (a) Isomerase, (b) Dehydrogenase, (c) Kinase

Answer 37

A) isomerase

Question 38

What happens to electrons stripped from glucose? (a) They are transferred directly to oxygen, (b) They are passed through NAD+ and FAD, (c) They are stored in glucose.

Answer 38

b) They are passed through NAD+ and FAD.

Question 39

What is the first step in glycolysis? (a) Energy generation, (b) Phosphorylation of glucose, (c) Electron transfer

Answer 39

B) phosphorylation of glucose

Question 40

Which molecule donates electrons to NAD+? (a) Water, (b) Glucose, (c) Carbon dioxide

Answer 40

B) glucose

Question 41

Q: What is the final product of glycolysis? (a) Carbon dioxide, (b) ATP, (c) Pyruvate

Answer 41

C) pyruvate

Question 42

How many ATP are generated in the energy payoff phase of glycolysis? (a) 4 ATP, (b) 2 ATP, (c) 1 ATP

Answer 42

A ) 4 ATP

Question 43

Which stage of cellular respiration produces the most ATP? (a) Glycolysis, (b) The Citric Acid Cycle, (c) Oxidative Phosphorylation

Answer 43

C) oxidative phosphorylation

Question 44

What happens to oxygen at the end of the electron transport chain? (a) It is oxidized, (b) It accepts electrons, (c) It is converted into ATP

Answer 44

B) it accepts electrons

Question 45

In which stage is carbon dioxide released? (a) Glycolysis, (b) Pyruvate oxidation and Citric Acid Cycle, (c) Electron transport chain

Answer 45

B) pyruvate oxidation and citric acid cycle

Question 46

What is the key electron carrier used in the Citric Acid Cycle? (a) NAD+, (b) ATP, (c) Oxygen

Answer 46

A) NAD +

Question 47

What type of molecule can cellular respiration break down for energy? (a) Carbohydrates, (b) Lipids (c) Proteins, (d) All of the above

Answer 47

D) all of the above

Question 48

What happens in the energy investment phase of glycolysis? (a) ATP is consumed, (b) ATP is produced, (c) Electrons are transferred

Answer 48

A) atp is consumed

Question 49

Which type of phosphorylation occurs in the electron transport chain? (a) Oxidative phosphorylation, (b) Substrate-level phosphorylation, (c) Photophosphorylation

Answer 49

a) Oxidative phosphorylation.

Question 50

What molecules are produced during pyruvate oxidation? (a) ATP, (b) NADH and CO₂, (c) FADH₂

Answer 50

(b) NADH and CO₂.

Question 51

How is energy harvested from glucose in a controlled manner? (a) Through a single reaction, (b) Through stepwise redox reactions, (c) Through immediate oxidation

Answer 51

B) through stepwise redox rxn