Question 1

Which of the following best describes the role of mast cells and histamines during the inflammatory response?

Accepted Answer

They initiate the inflammatory response by releasing signaling molecules that increase blood flow and attract phagocytes.

Question 2

A child is born without a thymus gland. Which of the following consequences is most likely?

Accepted Answer

The child will be unable to differentiate and mature T cells.

Question 3

Which of the following statements about the complement system is correct?

Accepted Answer

It is a group of proteins that act together in a cascade to kill bacteria by puncturing their cell walls.

Question 4

Why do birds excrete nitrogenous waste as uric acid rather than urea or ammonia?

Accepted Answer

Uric acid is less toxic and requires little water for excretion.

Question 5

A marine fish is accidentally placed in fresh water and dies. What is the most likely explanation?

Accepted Answer

It was so hyperosmotic to the fresh water that it could not osmoregulate, causing its tissues to swell and die.

Question 6

Which hormone is primarily responsible for sodium homeostasis in the human body?

Accepted Answer

Aldosterone

Question 7

Which of the following best explains why steroid hormones can regulate gene transcription?

Accepted Answer

They bind to intracellular receptor proteins, which then regulate gene transcription.

Question 8

Which organ in the human body has both exocrine and endocrine functions?

Accepted Answer

Pancreas

Question 9

Which of the following is an example of positive feedback in the human body?

Accepted Answer

The release of oxytocin during labor, which stimulates more oxytocin release.

Question 10

Which hormone is released by the posterior pituitary but produced in the hypothalamus?

Accepted Answer

ADH (antidiuretic hormone)

Question 11

A patient is injected with LH (luteinizing hormone). What is the expected effect in a male?

Accepted Answer

Increased production of testosterone

Question 12

Which of the following best explains why hormones do not affect every cell in the body?

Accepted Answer

Only cells with specific receptors for the hormone can respond.

Question 13

Which of the following is a correct sequence of structures through which sperm pass during ejaculation?

Accepted Answer

Epididymis → vas deferens → ejaculatory duct → urethra

Question 14

Which of the following best describes the difference between sperm and semen?

Accepted Answer

Sperm contains only spermatozoa, while semen contains sperm cells plus secretions from accessory glands.

Question 15

Which phase of the human ovarian cycle immediately follows ovulation?

Accepted Answer

Luteal phase

Question 16

During which stage of embryonic development do cells arrange themselves into three layers called ectoderm, mesoderm, and endoderm?

Accepted Answer

Gastrulation

Question 17

Which hormone is tested for in a standard home pregnancy test?

Accepted Answer

Human chorionic gonadotropin (hCG)

Question 18

Which structure in the female reproductive system is ciliated and is the usual site of fertilization?

Accepted Answer

Fallopian tube

Question 19

What is the main advantage of sexual reproduction over asexual reproduction?

Accepted Answer

It results in greater genetic diversity among offspring.

Question 20

Which embryonic structure eventually forms the spinal cord in humans?

Accepted Answer

Neural tube

Comprehensive Step-by-Step Guidance for Biology Exam Review (Chapters on Immunity, Endocrine, and Reproduction)

Study Guide - Practice Questions