Question 1

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

Accepted Answer

It forms a selectively permeable boundary that controls what enters and exits the cell.

Question 2

A cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

The cell will shrink as water leaves the cell to balance solute concentrations.

Question 3

Which process requires energy input from ATP to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 4

During which phase of mitosis are sister chromatids separated and pulled to opposite ends of the cell?

Accepted Answer

Anaphase

Question 5

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

Accepted Answer

Rough endoplasmic reticulum

Question 6

A patient is receiving intravenous fluids. Why is it important that these fluids are isotonic to the patient’s blood?

Accepted Answer

Isotonic fluids maintain the normal shape and function of blood cells by preventing net water movement into or out of the cells.

Question 7

Which equation best represents the movement of water across a semipermeable membrane due to osmosis?

Accepted Answer

$$ \Delta \Psi = \Psi_s + \Psi_p $$

Question 8

A drug inhibits the sodium-potassium pump in nerve cells. What effect would this have on the cell?

Accepted Answer

The cell would lose its ability to maintain membrane potential, disrupting nerve signaling.

Question 9

Which of the following is TRUE about facilitated diffusion?

Accepted Answer

It uses membrane proteins to help substances move down their concentration gradient.

Question 10

Which cellular process is responsible for engulfing large particles like bacteria?

Accepted Answer

Phagocytosis

Question 11

What is the main function of mitochondria in muscle cells during exercise?

Accepted Answer

To produce ATP for energy, supporting endurance and muscle activity.

Question 12

Which of the following statements about the plasma membrane is FALSE?

Accepted Answer

It is impermeable to all substances.

Question 13

Which organelle modifies and packages proteins for transport within or outside the cell?

Accepted Answer

Golgi apparatus

Question 14

During which stage of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 15

Which of the following best describes simple diffusion?

Accepted Answer

Movement of molecules from high to low concentration without energy or assistance.

Question 16

Which equation represents the energy produced by mitochondria during cellular respiration?

Accepted Answer

$$ C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP $$

Question 17

Which of the following is a function of the smooth endoplasmic reticulum?

Accepted Answer

Lipid synthesis and regulation of calcium levels

Question 18

Which process is responsible for moving large molecules out of the cell using vesicles?

Accepted Answer

Exocytosis

Question 19

A mutation causes a protein to be misfolded and sent to the wrong place in the cell. What is a possible consequence?

Accepted Answer

The cell may experience stress and build up waste, potentially leading to cell death.

Question 20

Which of the following best explains why cells must regulate the passage of ions and molecules across their membranes?

Accepted Answer

To maintain homeostasis and prevent electrical or chemical imbalances.

The Cellular Level of Organization: Study Guide

Study Guide - Practice Questions