Lecture 5 Part 2 - MC

Question 1

What is the primary function of glycosidases or carbohydrases in carbohydrate digestion?

A) To emulsify fats
B) To hydrolyze or break down carbohydrates
C) To absorb monosaccharides directly
D) To produce bile

Answer 1

B

Question 2

Where does most digestion of polysaccharides take place in the digestive system?

A) In the stomach
B) In the duodenum of the small intestine
C) In the colon
D) In the liver

Answer 2

B

Question 3

How does bicarbonate influence carbohydrate digestion in the duodenum?

A) It decreases the pH, inhibiting enzyme activity
B) It increases the pH, optimizing pancreatic alpha-amylase activity
C) It breaks down carbohydrates directly
D) It absorbs glucose

Answer 3

B

Question 4

Which of the following is NOT correctly matched with its function in carbohydrate digestion?

A) Alpha-amylase - Hydrolyzes alpha(1-4) glycosidic bonds in amylopectin
B) Alpha-limit dextrinase - Removes single glucose units from alpha(1-4) glucosyl chains
C) Alpha(1-6) glucosidase - Hydrolyzes alpha(1-4) bonds
D) Disaccharidases - Hydrolyze disaccharides into monosaccharides

Answer 4

C

Question 5

What does alpha-amylase NOT hydrolyze?

A) Alpha(1-4) glycosidic bonds far from alpha(1-6) bonds
B) Alpha(1-4) glycosidic bonds close to alpha(1-6) bonds
C) Alpha(1-6) glycosidic bonds by itself
D) Both B and C are correct

Answer 5

D

Question 6

Which enzymes are responsible for breaking down disaccharides into monosaccharides?

A) Pancreatic lipases
B) Disaccharidases such as lactase, sucrase, isomaltase, and trehalase
C) Amylases
D) Bile acids

Answer 6

B

Question 7

Where are disaccharidases such as lactase and sucrase located within the digestive tract?

A) In the stomach lining
B) Within the microvilli of enterocytes in the brush border
C) In the pancreatic ducts
D) In the liver cells

Answer 7

B