Question 1

Which of the following best describes homeostasis in the human body?

Accepted Answer

The maintenance of a stable internal environment despite changes in the external environment.

Question 2

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which of the following ions is most likely involved in conducting electrical currents in muscle cells?

Accepted Answer

Sodium ($$\mathrm{Na^+})$$

Question 3

Which of the following best explains the function of a buffer in body fluids?

Accepted Answer

Buffers stabilize the pH of a solution by removing or replacing hydrogen ions.

Question 4

A solution contains $$0.1$$ mol/L of $$\mathrm{NaCl}$$ and $$0.1$$ mol/L of $$\mathrm{KCl}. $$What is the total osmolarity of the solution?

Accepted Answer

$$0.4$$ osmoles/L

Question 5

Which of the following is a correct description of a positive feedback mechanism?

Accepted Answer

A process in which the initial stimulus produces a response that amplifies or enhances the original change.

Question 6

Which of the following best describes the structure of a phospholipid bilayer in the plasma membrane?

Accepted Answer

A double layer of phospholipids with hydrophobic tails facing inward and hydrophilic heads facing outward.

Question 7

A scientist is studying the movement of water across a cell membrane from an area of low solute concentration to an area of high solute concentration. Which process is being observed?

Accepted Answer

Osmosis

Question 8

Which organelle is responsible for generating most of the ATP required for cellular operations?

Accepted Answer

Mitochondrion

Question 9

A cell is placed in a solution and does not change in volume. What can be concluded about the solution?

Accepted Answer

The solution is isotonic to the cell.

Question 10

Which of the following best describes the role of enzymes in the human body?

Accepted Answer

Enzymes speed up chemical reactions without being consumed in the reaction.

Question 11

A patient has a genetic mutation that affects the anchoring proteins in their plasma membranes. Which cellular function is most likely to be impaired?

Accepted Answer

Stabilization of the membrane's position within the cell

Question 12

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes are atoms of the same element that have different numbers of neutrons.

Question 13

Which of the following is a polysaccharide important for energy storage in humans?

Accepted Answer

Glycogen

Question 14

A cell is exposed to a toxin that inhibits the function of ribosomes. What process will be directly affected?

Accepted Answer

Protein synthesis

Question 15

Which of the following best describes the process of phagocytosis?

Accepted Answer

The engulfing of extracellular materials or pathogens by enclosure in a membranous vesicle.

Question 16

Which of the following is true about carrier proteins in the plasma membrane?

Accepted Answer

Carrier proteins bind ligands and transport them across the membrane.

Question 17

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation has a positive charge, while an anion has a negative charge.

Question 18

A scientist adds a base to a solution, which removes hydrogen ions. What effect does this have on the pH of the solution?

Accepted Answer

The pH increases.

Question 19

Which of the following best describes the process of cell differentiation?

Accepted Answer

The development of specific cellular characteristics and functions that are different from the original cell.

Question 20

A patient is diagnosed with a disease that affects the integrity of the plasma membrane, making it unable to separate from the cell without damage. Which component is most likely affected?

Accepted Answer

Integral proteins

Fundamental Concepts in Anatomy & Physiology: Cells, Chemistry, and Biological Processes

Study Guide - Practice Questions

Study Guide - Flashcards