Q: During digestion, which of the following equations correctly represents the breakdown of proteins in the small intestine?

$$\text{proteins} \xrightarrow{\text{trypsin}} \text{peptides}$$

Question 1

Which of the following best describes the role of peristalsis in the digestive system?

Accepted Answer

It pushes food along the gut by coordinated contractions of circular and longitudinal muscles.

Question 2

A patient is unable to digest starch properly due to a deficiency in a specific enzyme. Which enzyme is most likely deficient, and where is it primarily produced?

Accepted Answer

Amylase; salivary glands

Question 3

Which of the following statements about bile is correct?

Accepted Answer

Bile is produced by the liver, stored in the gall bladder, and aids in digestion without containing enzymes.

Question 4

In the stomach, which enzyme is responsible for the initial breakdown of proteins, and what is its optimal pH?

Accepted Answer

Pepsin; pH 2

Question 5

Which of the following is the correct sequence of events for the digestion and absorption of starch?

Accepted Answer

Starch $$\rightarrow$$ maltose $$\rightarrow$$ glucose

Question 6

A person eats a meal rich in lipids. Which enzyme is primarily responsible for breaking down these lipids, and what are the end products?

Accepted Answer

Lipase; glycerol and fatty acids

Question 7

Which part of the digestive system is mainly responsible for absorbing water and storing waste products before removal from the body?

Accepted Answer

Large intestine

Question 8

If the sphincter muscle at the end of the stomach fails to function properly, which of the following is most likely to occur?

Accepted Answer

Semi-digested food will enter the duodenum prematurely, potentially causing indigestion.

Question 9

Which enzyme is responsible for converting peptides into amino acids, and where does this process occur?

Accepted Answer

Peptidases; small intestine wall

Question 10

A patient has a genetic mutation that prevents the production of maltase in the small intestine. What is the most likely consequence?

Accepted Answer

Maltose cannot be converted to glucose.

Question 11

Which of the following best explains why humans can eat while standing on their heads?

Accepted Answer

Peristalsis moves food through the gut independently of gravity.

Question 12

Which of the following is NOT a correct pairing of enzyme and substrate?

Accepted Answer

Lipase; peptides

Question 13

During digestion, which of the following equations correctly represents the breakdown of proteins in the small intestine?

Accepted Answer

$$	ext{proteins} \xrightarrow{	ext{trypsin}} 	ext{peptides}$$

Question 14

Which of the following is a function of hydrochloric acid in the stomach?

Accepted Answer

It kills bacteria and provides optimal pH for pepsin activity.

Question 15

A person has a blockage in the bile duct. Which digestive process will be most affected?

Accepted Answer

Emulsification of lipids in the duodenum

Question 16

Which of the following enzymes is produced by both the salivary glands and the pancreas?

Accepted Answer

Amylase

Question 17

If a person’s pancreas is unable to produce digestive enzymes, which of the following processes will be most directly impaired?

Accepted Answer

Digestion of lipids, proteins, and carbohydrates in the small intestine

Question 18

Which of the following best describes the end products of lipid digestion that can be absorbed into the blood?

Accepted Answer

Glycerol and fatty acids

Question 19

Which process is assisted by both mechanical and chemical digestion in the mouth?

Accepted Answer

Breakdown of starch by amylase and chewing

Question 20

Which of the following is the correct equation for the conversion of maltose to glucose in the small intestine?

Accepted Answer

$$	ext{maltose} \xrightarrow{	ext{maltase}} 	ext{glucose}$$

Digestive System and Enzymatic Digestion in Humans

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