Question 1

Which of the following best describes the main structural difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus containing DNA, while prokaryotic cells have DNA in the nucleoid region.

Question 2

Why does the surface-to-volume ratio limit the maximum size of a cell?

Accepted Answer

As a cell grows, its volume increases faster than its surface area, limiting efficient exchange of materials.

Question 3

Which component of the plasma membrane is primarily responsible for its selective permeability?

Accepted Answer

Phospholipid bilayer

Question 4

What is the main function of cholesterol in the plasma membrane?

Accepted Answer

To stabilize membrane fluidity across temperature changes

Question 5

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules from high to low concentration through a protein channel without energy input

Question 6

A human red blood cell is placed in a hypotonic solution. Predict the direction of water movement and the physiological outcome for the cell.

Accepted Answer

Water moves into the cell, causing it to swell and possibly burst.

Question 7

Which process is responsible for the uptake of large solid particles, such as bacteria, by a white blood cell?

Accepted Answer

Phagocytosis

Question 8

Which organelle is primarily responsible for packaging and modifying proteins for secretion?

Accepted Answer

Golgi complex

Question 9

What is the main role of mitochondria in eukaryotic cells?

Accepted Answer

ATP production through cellular respiration

Question 10

Which equation correctly represents the overall process of cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 ightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{ATP}$$

Question 11

Where does the citric acid cycle (Krebs cycle) occur within the cell?

Accepted Answer

Mitochondrial matrix

Question 12

Which of the following best explains why oxygen is essential for the electron transport chain in cellular respiration?

Accepted Answer

Oxygen acts as the final electron acceptor, allowing the chain to continue and ATP to be produced.

Question 13

Which of the following is a key difference between cellular respiration and fermentation?

Accepted Answer

Cellular respiration requires oxygen, while fermentation does not.

Question 14

Under which condition do human muscle cells switch to lactic acid fermentation, and what is a physiological effect?

Accepted Answer

When oxygen is scarce; buildup of lactic acid causing muscle fatigue

Question 15

Which of the following best describes osmosis?

Accepted Answer

Movement of water from an area of low solute concentration to high solute concentration across a selectively permeable membrane

Question 16

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

Accepted Answer

It will shrink as water leaves the cell.

Question 17

Which of the following processes requires energy input from ATP?

Accepted Answer

Active transport

Question 18

Which organelle contains hydrolytic enzymes for breaking down waste materials and cellular debris?

Accepted Answer

Lysosome

Question 19

Which of the following best describes the role of carbohydrates in the plasma membrane?

Accepted Answer

They serve as recognition sites for cell-cell interactions.

Question 20

Which phase of cellular respiration produces the most ATP, and where does it occur?

Accepted Answer

Electron transport chain; inner mitochondrial membrane

Cell Structure, Membrane Transport, and Cellular Respiration Study Guide

Study Guide - Practice Questions