Question 1

Which of the following best explains why a giant single-celled organism would not be viable in nature?

Accepted Answer

Its membrane surface area would not increase fast enough to support the increased volume's metabolic needs.

Question 2

If an animal's linear dimension (e.g., height) doubles, by what factor does its surface area and volume increase, respectively?

Accepted Answer

Surface area increases by 4, volume increases by 8.

Question 3

Which adaptation would most effectively increase the rate of material exchange in a large, multicellular organism?

Accepted Answer

Developing highly branched networks of transport tubes.

Question 4

A small lizard and a large lizard are both at rest at the same temperature. According to metabolic rate allometry, which statement is correct?

Accepted Answer

The large lizard has a higher total metabolic rate, but a lower metabolic rate per unit body mass.

Question 5

Which of the following equations correctly represents the relationship between metabolic rate (MR) and body size (M) in mammals, according to the study materials?

Accepted Answer

$$MR \propto M$$^{0.7}$$

Question 6

Why can small animals like insects climb vertical surfaces more easily than large animals?

Accepted Answer

They have a higher surface area of their feet relative to their body weight.

Question 7

Which of the following best describes the difference between basal metabolic rate (BMR) and standard metabolic rate (SMR)?

Accepted Answer

BMR applies to endotherms at rest, while SMR applies to ectotherms at a specified temperature.

Question 8

A scientist wants to scale up an ant to the size of a cow. According to the principles of surface area and volume, what is the most likely outcome?

Accepted Answer

The ant would be too weak or too heavy to stand up due to insufficient support structure strength.

Question 9

Which of the following is a direct consequence of metabolic rate allometry in large mammals compared to small mammals?

Accepted Answer

Large mammals metabolize drugs more slowly per unit body mass.

Question 10

Which scenario best illustrates the concept of convergent evolution as explained by physical constraints?

Accepted Answer

Dolphins and sharks both have streamlined bodies for efficient swimming, despite being unrelated.

Question 11

Which of the following best explains why endotherms require more food and oxygen than ectotherms of similar size?

Accepted Answer

Endotherms have a much higher metabolic rate due to internal heat production.

Question 12

A marathon runner is operating at their maximal metabolic rate. Which of the following is true about their energy use?

Accepted Answer

They are using aerobic metabolism at the highest sustainable rate.

Question 13

Which of the following is NOT a strategy organisms use to increase exchange surface area relative to volume?

Accepted Answer

Increasing the thickness of the body wall.

Question 14

If a mouse and an elephant are both given the same dose of anesthetic per kilogram of body weight, what is the most likely outcome?

Accepted Answer

The mouse will be under-anesthetized and the elephant may be overdosed.

Question 15

Which of the following statements about bioenergetics is correct?

Accepted Answer

Organisms use energy for self-organization and self-maintenance, unlike machines.

Question 16

A researcher observes that a certain animal can maintain a maximal metabolic rate about ten times its basal metabolic rate. What does this suggest about the animal?

Accepted Answer

It is likely an endotherm capable of sustained physical activity.

Question 17

Which of the following best explains why larger animals have slower heart rates than smaller animals?

Accepted Answer

Their tissues require less oxygen and nutrients per unit time due to lower metabolic intensity.

Question 18

Which of the following is an example of allometry?

Accepted Answer

A human baby's head is proportionally larger than an adult's head.

Question 19

Why is the higher surface area to volume ratio in small animals not a sufficient explanation for metabolic rate allometry?

Accepted Answer

Because metabolic rate allometry involves more complex factors than just heat loss, such as tissue metabolic intensity.

Animal Structure and Function: Principles of Form, Function, and Bioenergetics

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