Question 1

Which of the following best describes the three main parts of a typical eukaryotic cell and their general functions?

Accepted Answer

Nucleus (controls cell activities), cytoplasm (site of metabolic reactions), plasma membrane (regulates entry and exit of substances)

Question 2

A red blood cell is placed in a hypertonic solution. Which of the following best describes what will happen to the cell, and why?

Accepted Answer

The cell will shrink because water moves out of the cell by osmosis.

Question 3

Which of the following statements correctly compares cytoplasm and cytosol?

Accepted Answer

Cytoplasm includes the cytosol and organelles, while cytosol is the fluid portion of the cytoplasm.

Question 4

Which of the following best describes the distribution and function of lipids in the plasma membrane?

Accepted Answer

Lipids form a bilayer that provides a semi-permeable barrier and fluidity to the membrane.

Question 5

Which of the following best explains the energy requirement and mechanism of facilitated diffusion?

Accepted Answer

Facilitated diffusion does not require energy and uses membrane proteins to move substances down their concentration gradient.

Question 6

A patient is given an intravenous solution that is hypotonic relative to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will swell and may burst as water enters by osmosis.

Question 7

Which of the following best describes the difference between primary and secondary active transport?

Accepted Answer

Primary active transport uses ATP directly, while secondary active transport uses the energy stored in ion gradients.

Question 8

Which of the following organelles is responsible for synthesizing proteins, and what is its basic structure?

Accepted Answer

Ribosomes; composed of rRNA and proteins, found free in cytosol or attached to rough ER.

Question 9

Which of the following best describes the role of the cytoskeleton in cellular motion?

Accepted Answer

The cytoskeleton provides structural support and enables movement through microfilaments, intermediate filaments, and microtubules.

Question 10

Which of the following correctly matches the organelle with its function in the endomembrane system?

Accepted Answer

Golgi apparatus: modifies, sorts, and packages proteins for secretion or delivery to other organelles.

Question 11

Which of the following best describes the process of transcription?

Accepted Answer

Transcription is the synthesis of mRNA from a DNA template in the nucleus.

Question 12

During which phase of the cell cycle does DNA replication occur, and what is its significance?

Accepted Answer

S phase of interphase; ensures each daughter cell receives an identical set of chromosomes.

Question 13

Which of the following best distinguishes between mitosis and cytokinesis?

Accepted Answer

Mitosis divides the nucleus and its chromosomes, while cytokinesis divides the cytoplasm.

Question 14

Which of the following is a correct description of the structure and function of centrioles?

Accepted Answer

Centrioles are cylindrical structures composed of microtubules that organize the mitotic spindle during cell division.

Question 15

Which of the following best describes the movement of water during osmosis?

Accepted Answer

Water moves from an area of lower solute concentration to an area of higher solute concentration across a selectively permeable membrane.

Question 16

Which of the following best describes the structure and function of the nucleolus?

Accepted Answer

The nucleolus is a dense region within the nucleus responsible for ribosomal RNA synthesis.

Question 17

Which of the following best describes the fluid mosaic model of the plasma membrane?

Accepted Answer

The plasma membrane is a dynamic structure with proteins and carbohydrates embedded in or attached to a phospholipid bilayer.

Question 18

Which of the following best describes the mechanism of vesicular transport known as phagocytosis?

Accepted Answer

The cell engulfs large particles or microorganisms by extending pseudopods and enclosing them in a vesicle.

Question 19

A cell is exposed to a toxin that inhibits the function of microtubules. Which of the following cellular processes would be most directly affected?

Accepted Answer

Chromosome separation during mitosis.

Cell Structure, Membrane Transport, and Cell Cycle Study Guide

Study Guide - Practice Questions