Exam 2 Cell Respiration

Question 1

What is the primary purpose of cellular respiration?

Answer 1

To convert biochemical energy from nutrients into adenosine triphosphate (ATP).

Question 2

True or False: Cellular respiration occurs only in the presence of oxygen.

Answer 2

False.

Question 3

Fill in the blank: The three main stages of cellular respiration are ________, Krebs cycle, and electron transport chain.

Answer 3

glycolysis

Question 4

What is the main product of glycolysis?

Answer 4

Pyruvate.

Question 5

Which molecule acts as the final electron acceptor in aerobic respiration?

Answer 5

Oxygen.

Question 6

Multiple Choice: Which of the following is NOT a product of the Krebs cycle? A) ATP B) NADH C) FADH2 D) Glucose

Answer 6

D) Glucose.

Question 7

What is the net gain of ATP molecules from one molecule of glucose during glycolysis?

Answer 7

2 ATP.

Question 8

True or False: Lactic acid fermentation occurs in muscle cells when oxygen is scarce.

Answer 8

True.

Question 9

What is the primary role of NAD+ in cellular respiration?

Answer 9

To act as an electron carrier.

Question 10

Fill in the blank: The process of converting glucose into pyruvate is called ________.

Answer 10

glycolysis

Question 11

Name the cycle that produces carbon dioxide as a waste product.

Answer 11

Krebs cycle.

Question 12

Multiple Choice: How many ATP molecules can be produced from one molecule of glucose during aerobic respiration? A) 2 B) 18 C) 36 D) 38

Answer 12

C) 36.

Question 13

What are the two types of fermentation?

Answer 13

Lactic acid fermentation and alcoholic fermentation.

Question 14

True or False: The electron transport chain occurs in the mitochondria.

Answer 14

True.

Question 15

What is the role of ATP synthase in cellular respiration?

Answer 15

To synthesize ATP from ADP and inorganic phosphate.

Question 16

Fill in the blank: In the absence of oxygen, cells can perform ________ to produce energy.

Answer 16

fermentation

Question 17

What are the end products of alcoholic fermentation?

Answer 17

Ethanol and carbon dioxide.

Question 18

Multiple Choice: Which of the following processes generates the most ATP? A) Glycolysis B) Krebs Cycle C) Electron Transport Chain D) Fermentation

Answer 18

C) Electron Transport Chain.

Question 19

What is oxidative phosphorylation?

Answer 19

The process of ATP generation that occurs during the electron transport chain.

Question 20

True or False: The Krebs cycle occurs in the cytoplasm of prokaryotic cells.

Answer 20

False.

Question 21

What is produced during the decarboxylation of pyruvate?

Answer 21

Acetyl-CoA and carbon dioxide.

Question 22

Fill in the blank: The energy currency of the cell is ________.

Answer 22

ATP

Question 23

What is the total yield of NADH from one turn of the Krebs cycle?

Answer 23

3 NADH.

Question 24

Multiple Choice: Which of the following is a byproduct of aerobic cellular respiration? A) Oxygen B) Glucose C) Carbon dioxide D) Lactic acid

Answer 24

C) Carbon dioxide.

Question 25

True or False: The main function of the electron transport chain is to produce heat.

Answer 25

False.

Question 26

What is the significance of the proton gradient in cellular respiration?

Answer 26

It drives the synthesis of ATP via ATP synthase.