Question 1

Which of the following best describes the difference between a relaxed and a contracted sarcomere, as shown in the diagram?

Accepted Answer

The Z lines move closer together during contraction, shortening the sarcomere.

Question 2

What is the primary function of ATP in the sliding-filament model of muscle contraction?

Accepted Answer

ATP binds to myosin, allowing it to detach from actin and reset for another power stroke.

Question 3

Which of the following sequences correctly describes the order of events in muscle contraction?

Accepted Answer

Nerve impulse → Acetylcholine release → Depolarization → Ca$$^{2+}$$ release → Cross-bridge formation

Question 4

Which molecule binds to troponin, causing the exposure of myosin-binding sites on actin filaments?

Accepted Answer

Ca$$^{2+}$$

Question 5

A motor unit consists of:

Accepted Answer

One motor neuron and all the muscle fibers it innervates

Question 6

Which type of muscle is both striated and voluntary?

Accepted Answer

Skeletal muscle

Question 7

Which of the following is a characteristic of a hydrostatic skeleton?

Accepted Answer

It relies on fluid pressure within body cavities to support movement.

Question 8

Which phylum is characterized by having an exoskeleton made of chitin?

Accepted Answer

Arthropoda

Question 9

Which mineral is most abundant in both bone and cartilage?

Accepted Answer

Calcium

Question 10

Which of the following best defines a fixed action pattern (FAP)?

Accepted Answer

An innate, unchangeable behavioral sequence triggered by a specific stimulus

Question 11

Which of the following is an example of classical conditioning?

Accepted Answer

A dog salivating at the sound of a bell after repeated association with food

Question 12

Which type of learning involves forming an internal map of the environment?

Accepted Answer

Spatial learning

Question 13

What is the main function of the sarcoplasmic reticulum in muscle fibers?

Accepted Answer

To store and release Ca$$^{2+}$$ ions during muscle contraction

Question 14

Which of the following best describes the role of myosin in muscle contraction?

Accepted Answer

Myosin heads bind to actin and pull the thin filaments toward the center of the sarcomere.

Question 15

Which of the following is an example of agonistic behavior?

Accepted Answer

A lioness growling to avoid a fight over food

Question 16

Which of the following best describes the difference between innate and learned behavior?

Accepted Answer

Innate behavior is genetically programmed, while learned behavior is acquired through experience.

Question 17

Which of the following is NOT a function of pheromones?

Accepted Answer

Transmitting visual signals

Question 18

Which of the following best describes altruism in animal behavior?

Accepted Answer

An individual acts to benefit another at a cost to itself.

Question 19

Which of the following is a real-world example of spatial learning?

Accepted Answer

A wasp memorizing landmarks around its nest to find its way home.

Question 20

Which of the following best describes the function of the waggle dance in honeybees?

Accepted Answer

It communicates both the direction and distance to a food source.

Motor Mechanisms and Animal Behavior – Study Guide

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