Question 1

Which of the following best describes the process of hydrolysis during digestion?

Accepted Answer

The cleavage of chemical bonds by the addition of water.

Question 2

Which enzyme is responsible for the initial chemical digestion of carbohydrates in the oral cavity?

Accepted Answer

α-Amylase

Question 3

Dietary fiber, such as cellulose, cannot be digested by human enzymes because:

Accepted Answer

It contains β(1→4) linkages that human enzymes cannot break.

Question 4

Which of the following is TRUE regarding the absorption of glucose in the small intestine?

Accepted Answer

Glucose is absorbed through secondary active transport with Na	extsuperscript{+}.

Question 5

A patient consumes a diet high in indigestible disaccharides (such as sorbitol). What is the most likely consequence?

Accepted Answer

Osmotic diarrhea due to water retention in the lumen

Question 6

Which of the following statements about brushborder enzymes is correct?

Accepted Answer

They are embedded in the membrane at the apical side of epithelial cells in the small intestine.

Question 7

Which of the following is the correct sequence for the digestion of starch?

Accepted Answer

Starch → Maltose → Glucose

Question 8

Which of the following is a function of dietary fiber in the colon?

Accepted Answer

It induces osmotic water flow, reducing constipation.

Question 9

Which of the following best explains why fat-soluble vitamin deficiencies can occur with the use of olestra or orlistat?

Accepted Answer

They block lipase activity, preventing fat digestion and absorption of vitamins A, D, E, and K.

Question 10

Which of the following is NOT a correct statement about protein digestion?

Accepted Answer

Protein digestion begins in the oral cavity with salivary proteases.

Question 11

Which of the following mechanisms is responsible for the absorption of fructose in the small intestine?

Accepted Answer

Facilitated diffusion along its concentration gradient

Question 12

A patient with chronic pancreatitis is likely to experience malabsorption of which macronutrient due to enzyme deficiency?

Accepted Answer

Proteins

Question 13

Which of the following is TRUE regarding the absorption of iron in the intestine?

Accepted Answer

Iron absorption is enhanced when body iron concentration is low.

Question 14

Which of the following best describes the role of bile salts in lipid digestion?

Accepted Answer

They emulsify lipids, increasing surface area for enzyme action.

Question 15

Which of the following is a correct statement about the absorption of nutrients in the large intestine?

Accepted Answer

Short-chain fatty acids produced by bacterial fermentation are absorbed by diffusion.

Question 16

Which of the following equations correctly represents the hydrolysis of sucrose?

Accepted Answer

$$\mathrm{C$$_{12}$$H_{22}O$$_{11}} + \mathrm{H_2O} \xrightarrow{	ext{sucrase}} \mathrm{C_6H_{12}$$O_6$$} + \mathrm{C_6H_{12}$$O_6$$}$ (glucose + fructose)

Question 17

Which of the following is a consequence of a defect in intestinal epithelial transporters for amino acids?

Accepted Answer

Protein malabsorption and possible nutritional deficiencies

Question 18

Which of the following best describes the difference between transcellular and paracellular absorption?

Accepted Answer

Transcellular absorption involves transport across the cell membrane, while paracellular absorption occurs between cells along gradients.

Question 19

Which of the following nutrients is absorbed in the terminal ileum with the help of intrinsic factor?

Accepted Answer

Vitamin B12

Digestion and Absorption in the Digestive System

Study Guide - Practice Questions

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