Question 1

Which of the following best describes the role of negative feedback in homeostasis? Choose the most accurate scenario.

Accepted Answer

Negative feedback opposes the initial change, helping to maintain stability in the internal environment.

Question 2

A patient has a mutation that prevents the formation of tight junctions in epithelial tissue. Which of the following is the most likely consequence?

Accepted Answer

Substances will pass freely between cells, compromising the barrier function of the epithelium.

Question 3

Which of the following molecules is most likely to diffuse freely across the plasma membrane without the aid of a channel or carrier protein?

Accepted Answer

O$$_2$$

Question 4

Which equation correctly represents the relationship between enzyme activity and substrate concentration, assuming Michaelis-Menten kinetics?

Accepted Answer

$$v = \frac{V_{max} [S]}{K_m + [S]}$$

Question 5

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails, causing them to arrange with heads facing water and tails facing inward.

Question 6

A person is exposed to a toxin that inhibits the function of mitochondria. Which cellular process will be most directly affected?

Accepted Answer

ATP production via aerobic respiration

Question 7

Which of the following is NOT a function of the extracellular matrix (ECM) in connective tissue?

Accepted Answer

Storing genetic information

Question 8

Which of the following best describes the difference between catabolic and anabolic reactions?

Accepted Answer

Catabolic reactions release energy by breaking down molecules; anabolic reactions consume energy to build molecules.

Question 9

Which of the following is a correct sequence for the levels of organization in the human body, from simplest to most complex?

Accepted Answer

Cell, tissue, organ, organ system, organism

Question 10

A patient is unable to absorb nutrients efficiently due to damage in the microvilli of their small intestine. Which function of epithelial tissue is most directly compromised?

Accepted Answer

Absorption

Question 11

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms

Question 12

Which of the following is a correct example of a positive feedback loop in the human body?

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions

Question 13

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is double-stranded, while RNA is typically single-stranded.

Question 14

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

Enzymes have active sites with unique shapes that fit only specific substrate molecules.

Question 15

A solution contains NaCl, KBr, and CH$$_4. $$Which molecule is most likely to be hydrophobic?

Accepted Answer

CH$$_4$$

Question 16

Which of the following is a function of muscle tissue?

Accepted Answer

Contraction to produce movement

Question 17

Which of the following best describes the function of lysosomes in a cell?

Accepted Answer

Break down waste materials and cellular debris

Question 18

Which of the following is a correct example of a carbohydrate and its function?

Accepted Answer

Glycogen: long-term energy storage in muscle and liver cells

Question 19

Which of the following best describes the role of the control center in a feedback loop?

Accepted Answer

Receives input from sensors and determines the appropriate response

Question 20

Which of the following statements about serous and mucous membranes is correct?

Accepted Answer

Serous membranes secrete a watery fluid to reduce friction; mucous membranes secrete mucus to trap particles.

Anatomy & Physiology: Foundational Concepts and Systems Study Guide

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