Question 1

Which of the following best describes the role of negative feedback in homeostasis? Consider a scenario where body temperature rises above normal.

Accepted Answer

Negative feedback reverses the initial change, triggering mechanisms to lower body temperature back to normal.

Question 2

A patient is experiencing muscle weakness due to low potassium levels. Which membrane structure is most directly involved in maintaining the proper concentration of potassium inside the cell?

Accepted Answer

Sodium-potassium pump

Question 3

Which of the following molecules is most likely to pass through the plasma membrane by simple diffusion?

Accepted Answer

Oxygen ($$O_2)$$

Question 4

Given the chemical formula $$NaCl$$, what type of bond is most likely present between sodium and chlorine?

Accepted Answer

Ionic bond

Question 5

Which organelle is primarily responsible for synthesizing proteins in the cell?

Accepted Answer

Ribosome

Question 6

A scientist measures the rate of an enzyme-catalyzed reaction and finds that increasing the substrate concentration increases the rate up to a point, after which the rate plateaus. What is this phenomenon called?

Accepted Answer

Enzyme saturation

Question 7

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

Accepted Answer

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

Question 8

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 9

A patient has a genetic mutation that affects the collagen fibers in connective tissue. Which function is most likely to be impaired?

Accepted Answer

Structural support and tensile strength

Question 10

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 require energy to build molecules.

Question 11

Which of the following is a function of the extracellular matrix in connective tissue?

Accepted Answer

Provides structural support and regulates cell behavior

Question 12

A cell is placed in a solution with a higher concentration of solutes than inside the cell. What will happen to the cell?

Accepted Answer

The cell will shrink as water leaves.

Question 13

Which of the following best describes a hydrogen bond?

Accepted Answer

A bond formed between a hydrogen atom and a highly electronegative atom such as oxygen or nitrogen.

Question 14

Which of the following is NOT a function of epithelial tissue?

Accepted Answer

Contraction

Question 15

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 substrates.

Question 16

A mutation in the gene coding for a membrane channel protein affects the transport of $$Na^+$$ ions. What is the most likely consequence for the cell?

Accepted Answer

The cell will have difficulty maintaining its membrane potential.

Question 17

Which of the following best describes the structure of DNA?

Accepted Answer

A double helix composed of nucleotides with complementary base pairing.

Question 18

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 19

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

Accepted Answer

Digest and recycle cellular waste

Question 20

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

Accepted Answer

Increased leakage of substances between cells

Anatomy & Physiology: Foundational Concepts and Study Guide

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