Question 1

Which of the following best describes the main advantage of an alimentary canal over a gastrovascular cavity for digestion?

Accepted Answer

It allows for the sequential processing of food in specialized compartments.

Question 2

A patient is prescribed antibiotics for several weeks and later develops a vitamin K deficiency. What is the most likely explanation for this outcome?

Accepted Answer

The antibiotics killed beneficial bacteria in the large intestine that synthesize vitamin K.

Question 3

Which of the following feeding mechanisms is used by animals such as whales and manta rays?

Accepted Answer

Suspension feeding

Question 4

During the Heimlich maneuver, what physical process helps dislodge food from a choking victim’s airway?

Accepted Answer

A forceful elevation of the diaphragm expels air from the lungs, pushing the obstruction out.

Question 5

Which enzyme is responsible for digesting starch molecules in the small intestine?

Accepted Answer

Pancreatic amylase

Question 6

Which of the following is a correct sequence of the four main stages of food processing in animals?

Accepted Answer

Ingestion → Digestion → Absorption → Elimination

Question 7

A person experiences heartburn after eating a large meal. What is the physiological cause of this sensation?

Accepted Answer

Acidic chyme flows backward from the stomach into the esophagus.

Question 8

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

Accepted Answer

Bile emulsifies fats, increasing their surface area for enzyme action.

Question 9

Which of the following statements about ATP is correct?

Accepted Answer

ATP powers cellular work by transferring a phosphate group to other molecules (phosphorylation).

Question 10

Which of the following is an example of an exergonic reaction in cellular metabolism?

Accepted Answer

The breakdown of glucose during cellular respiration

Question 11

A scientist adds pepsinogen and protein to a test tube with distilled water, but little protein digestion occurs. What should be added to accelerate protein digestion, and why?

Accepted Answer

Add $$\mathrm{HCl} to $$convert pepsinogen to active pepsin, which digests protein.

Question 12

Which of the following best explains why the small intestine is highly folded and covered with villi and microvilli?

Accepted Answer

To increase the surface area for nutrient absorption

Question 13

Which of the following is a correct description of the fate of energy extracted from food during cellular respiration?

Accepted Answer

Some energy is stored in ATP molecules, and the rest is released as heat.

Question 14

Which of the following best describes the function of the liver in the digestive system?

Accepted Answer

It processes and detoxifies blood from the intestines before releasing it into the circulatory system.

Question 15

Which of the following is a real-life example of a bulk feeder?

Accepted Answer

A heron swallowing a fish whole

Question 16

Which of the following statements about the laws of thermodynamics is correct?

Accepted Answer

Energy can change form but cannot be created or destroyed; energy transfers increase disorder (entropy).

Question 17

Which of the following best describes the difference between mechanical and chemical digestion?

Accepted Answer

Mechanical digestion physically breaks food into smaller pieces; chemical digestion breaks chemical bonds using enzymes.

Question 18

Which of the following is a plausible consequence if the epiglottis fails to close properly during swallowing?

Accepted Answer

Food enters the trachea, triggering a strong cough reflex.

Question 19

Which of the following best describes an omnivore and its feeding mechanism?

Accepted Answer

An organism that eats both plants and animals and ingests large pieces of food (bulk feeder).

Question 20

Which of the following best describes the relationship between the digestive and circulatory systems as mediated by the liver?

Accepted Answer

The liver processes blood from the digestive system and releases it into the circulatory system.

Digestive System, Food Processing, and Cellular Energy: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards