kreb cycle

Question 1

What is the primary function of the Krebs cycle?

Answer 1

To generate energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.

Question 2

True or False: The Krebs cycle occurs in the mitochondria.

Answer 2

True

Question 3

Fill in the blank: The Krebs cycle is also known as the __________ cycle.

Answer 3

citric acid

Question 4

What is the first molecule formed when acetyl-CoA enters the Krebs cycle?

Answer 4

Citrate

Question 5

How many carbon atoms are present in citrate?

Answer 5

Six

Question 6

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

Answer 6

D) Glucose

Question 7

What two molecules are produced during the decarboxylation steps of the Krebs cycle?

Answer 7

CO2 and NADH

Question 8

True or False: The Krebs cycle directly produces ATP.

Answer 8

False

Question 9

What is the role of oxaloacetate in the Krebs cycle?

Answer 9

It combines with acetyl-CoA to form citrate.

Question 10

Fill in the blank: The Krebs cycle produces __________, which is then used in the electron transport chain.

Answer 10

NADH and FADH2

Question 11

Short Answer: What enzyme is responsible for converting citrate to isocitrate?

Answer 11

Aconitase

Question 12

Multiple Choice: Which enzyme catalyzes the conversion of α-ketoglutarate to succinyl-CoA? A) Isocitrate dehydrogenase B) α-Ketoglutarate dehydrogenase C) Succinyl-CoA synthetase D) Fumarase

Answer 12

B) α-Ketoglutarate dehydrogenase

Question 13

How many times does the Krebs cycle turn for each molecule of glucose?

Answer 13

Two times

Question 14

What is produced during the conversion of succinyl-CoA to succinate?

Answer 14

GTP (or ATP)

Question 15

True or False: Fumarate is formed during the Krebs cycle.

Answer 15

True

Question 16

What molecule is regenerated at the end of the Krebs cycle to continue the cycle?

Answer 16

Oxaloacetate

Question 17

Fill in the blank: The Krebs cycle is part of the __________ metabolism pathway.

Answer 17

cellular respiration

Question 18

Multiple Choice: Which of the following is an intermediate of the Krebs cycle? A) Acetyl-CoA B) Glucose C) Lactate D) Pyruvate

Answer 18

A) Acetyl-CoA

Question 19

Short Answer: What is the significance of the electron carriers produced in the Krebs cycle?

Answer 19

They are used in the electron transport chain to produce ATP.

Question 20

What is the final product of the Krebs cycle?

Answer 20

Oxaloacetate (which is regenerated)

Question 21

True or False: The Krebs cycle is an anaerobic process.

Answer 21

False

Question 22

Fill in the blank: The enzyme __________ catalyzes the conversion of fumarate to malate.

Answer 22

Fumarase

Question 23

Multiple Choice: Which of the following is NOT a step in the Krebs cycle? A) Conversion of pyruvate to acetyl-CoA B) Conversion of malate to oxaloacetate C) Formation of citrate D) Glycolysis

Answer 23

D) Glycolysis

Question 24

What are the two main types of energy carriers produced in the Krebs cycle?

Answer 24

NADH and FADH2

Question 25

Short Answer: What happens to the carbon atoms released during the Krebs cycle?

Answer 25

They are released as carbon dioxide (CO2).

Question 26

True or False: The Krebs cycle is essential for aerobic respiration.

Answer 26

True