Question 1

Which of the following best explains why humans evolved to be sensitive to bitter and sour tastes?

Accepted Answer

To avoid foods that are likely to be poisonous or spoiled.

Question 2

Which of the following statements about taste buds is correct?

Accepted Answer

Taste buds are found on the tongue, cheeks, roof of mouth, and upper esophagus.

Question 3

A patient reports a burning sensation when eating spicy foods. Which receptor is primarily responsible for this sensation?

Accepted Answer

Capsaicin receptor (pain and temperature receptor)

Question 4

Which of the following best describes the process by which a sweet molecule is detected by a taste bud?

Accepted Answer

The molecule binds to a receptor, activating a second messenger system that results in a nerve signal.

Question 5

Which of the following is NOT one of the five basic tastes?

Accepted Answer

Spicy

Question 6

A food scientist is developing a new low-sodium seasoning. Which process, adapted from pharmaceutical drug discovery, is most likely being used?

Accepted Answer

Bioprospecting, which involves extracting, fractionating, and testing natural materials for activity.

Question 7

Which of the following best explains why the image of the tongue with distinct taste zones is incorrect?

Accepted Answer

All taste buds can detect all five basic tastes, not just specific regions.

Question 8

Which of the following foods is most likely to activate umami taste receptors?

Accepted Answer

Soy sauce

Question 9

Which of the following statements about olfactory cells is correct?

Accepted Answer

Olfactory cells are replaced every 60 days by differentiation of basal cells.

Question 10

A person is unable to distinguish between the flavors of apple and grape juice when food coloring is added. Which sense is most likely influencing their perception?

Accepted Answer

Vision

Question 11

Which of the following best describes the role of the thalamus in sensory perception?

Accepted Answer

It relays sensory information from the body to the somatosensory cortex.

Question 12

Which of the following equations best represents the relationship between the number of olfactory receptors and the number of odors humans can distinguish?

Accepted Answer

$$N_{odors} \gg N_{receptors}$$

Question 13

Which of the following is a correct sequence for the transmission of a touch signal from the skin to the brain?

Accepted Answer

Touch receptor → spinal cord → thalamus → somatosensory cortex

Question 14

Which of the following best explains why capsaicin is perceived as 'hot' or 'spicy'?

Accepted Answer

Capsaicin binds to temperature and pain receptors, not taste receptors.

Question 15

A food product is being analyzed for off-flavors using GC-MS-olfactometry. Which step involves human sensory evaluation?

Accepted Answer

After separation by gas chromatography, when a human sniffs the fractions.

Question 16

Which of the following best describes the function of supporting cells in a taste bud?

Accepted Answer

They provide structural and metabolic support to taste receptor cells.

Question 17

Which of the following is a real-world example of umami taste in food?

Accepted Answer

Parmesan cheese

Question 18

Which of the following best explains why the sense of smell is highly sensitive in humans?

Accepted Answer

Humans have over 400 types of olfactory receptors, allowing detection of over a trillion odors.

Question 19

Which of the following best describes the difference between taste and flavor?

Accepted Answer

Flavor is a combination of taste, smell, texture, temperature, sound, and color, while taste refers to the five basic tastes.

Question 20

Which of the following best explains why mint and capsaicin both affect temperature perception?

Accepted Answer

They both bind to temperature-sensitive receptors in the mouth.

Digestion and Senses: The Role of Sensory Systems in Nutrition

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