$$1 \text{ kcal} = 1,000 \text{ calories}$$

Question 1

Which feeding mechanism is demonstrated by the bird in the first image, and what is the primary advantage of this strategy?

Accepted Answer

Bulk feeding; it allows the animal to ingest large pieces of food, maximizing energy intake per feeding event.

Question 2

Refer to the third image (cat eating). Which stage of food processing is responsible for the absorption of small molecules into body cells?

Accepted Answer

Absorption

Question 3

Which enzyme is responsible for breaking down proteins into amino acids, as shown in the fourth image?

Accepted Answer

Protein-digesting enzyme (e.g., pepsin or trypsin)

Question 4

In the fifth image, what is the function of the gastrovascular cavity in the hydra?

Accepted Answer

It serves as a compartment for extracellular digestion of food particles.

Question 5

Based on the sixth image, which digestive adaptation is unique to birds and helps them mechanically process food?

Accepted Answer

Gizzard

Question 6

Which structure in the human digestive system (seventh image) prevents food from entering the trachea during swallowing?

Accepted Answer

Epiglottis

Question 7

What is the primary function of the villi and microvilli in the small intestine, as shown in the images of the intestinal wall?

Accepted Answer

To increase the surface area for nutrient absorption

Question 8

Which organ produces bile, and what is its role in digestion (see the image with the liver, gallbladder, and pancreas)?

Accepted Answer

Liver; emulsifies fats to aid in their digestion

Question 9

A person with a diet consisting only of corn (see the image with corn and beans) is likely to be deficient in which essential amino acid?

Accepted Answer

Lysine

Question 10

Which vitamin deficiency is most likely to cause scurvy, as indicated in the vitamin table?

Accepted Answer

Vitamin C

Question 11

If a person has a mutation in the gene for leptin, what is the most likely outcome regarding their body weight regulation?

Accepted Answer

They will have increased appetite and may become obese.

Question 12

Which of the following best explains why the large intestine is important for water balance in the body?

Accepted Answer

It absorbs water and vitamins produced by bacteria.

Question 13

A patient is experiencing frequent heartburn due to acid reflux. Which structure is most likely malfunctioning?

Accepted Answer

Esophageal sphincter

Question 14

Which of the following is a correct equation for the energy content of food, as measured in kilocalories?

Accepted Answer

$$1 	ext{ kcal} = 1,000 	ext{ calories}$$

Question 15

Which mineral is essential for the formation of hemoglobin and prevention of anemia?

Accepted Answer

Iron

Question 16

A person who consumes excessive sodium is at increased risk for which health problem?

Accepted Answer

High blood pressure (hypertension)

Question 17

Which of the following best describes the role of the hepatic portal vein?

Accepted Answer

It transports nutrient-rich blood from the intestines to the liver for processing.

Question 18

Which of the following is a real-world consequence of protein deficiency in the diet?

Accepted Answer

Malnutrition leading to impaired growth and immune function

Question 19

Which of the following dietary guidelines is recommended to reduce the risk of cancer?

Accepted Answer

Maintain a healthy weight and eat five or more servings of a variety of fruits and vegetables daily.

Question 20

Which of the following statements about the relationship between carbohydrate intake and obesity is supported by epidemiological studies?

Accepted Answer

Higher carbohydrate intake is associated with a lower risk of obesity, according to some population studies.

Nutrition and Digestion: Structure, Function, and Evolutionary Adaptations

Study Guide - Practice Questions