Protein Section Lecture #3 - MC

Question 1

Where does protein digestion primarily start?
A) Mouth
B) Stomach
C) Small intestine
D) Large intestine

Answer 1

B

Question 2

What role does the hormone gastrin play in the stomach?
A) It neutralizes stomach acid.
B) It triggers stomach churning and the release of gastric juice.
C) It directly digests proteins.
D) It absorbs amino acids.

Answer 2

B

Question 3

What is the function of hydrochloric acid (HCl) in protein digestion?
A) It activates pepsinogen into pepsin.
B) It breaks down carbohydrates.
C) It absorbs nutrients directly into the stomach lining.
D) It neutralizes enzymes.

Answer 3

A

Question 4

Why do chief cells secrete pepsinogen instead of active pepsin?
A) To prevent the digestion of stomach tissues.
B) Because it is more effective at digesting proteins.
C) To increase the pH level of the stomach.
D) Pepsinogen is more stable in an acidic environment.

Answer 4

A

Question 5

What is the role of mucous in the stomach during protein digestion?
A) It digests proteins into peptides.
B) It activates gastric enzymes.
C) It protects the stomach lining from digestive acids and enzymes.
D) It transports amino acids to the small intestine.

Answer 5

C

Question 6

Which hormone stimulates the pancreas to release bicarbonate into the small intestine?
A) Gastrin
B) Insulin
C) Secretin
D) Glucagon

Answer 6

C

Question 7

What is the final product of protein digestion before absorption?
A) Polypeptides
B) Di/tripeptides
C) Individual amino acids
D) Free fatty acids

Answer 7

C

Question 8

Where are most amino acids absorbed in the small intestine?
A) The entire length of the small intestine
B) Duodenum and upper portion of the jejunum
C) Ileum
D) Lower portion of the jejunum

Answer 8

B

Question 9

How are amino acids primarily transported into enterocytes?
A) Passive diffusion
B) Facilitated diffusion
C) Active transport using sodium-dependent transporters
D) Bulk flow

Answer 9

C

Question 10

Which statement best describes the fate of amino acids once they reach the liver?
A) They are excreted as waste.
B) They are stored for long-term energy.
C) They are used for energy production, gluconeogenesis, and protein synthesis.
D) They are converted directly into fat.

Answer 10

C