Question 1

Which of the following best explains why cells are typically small in size?

Accepted Answer

Smaller cells have a higher surface area-to-volume ratio, which facilitates efficient exchange of materials with their environment.

Question 2

Which structure is present in both prokaryotic and eukaryotic cells?

Accepted Answer

Ribosome

Question 3

A scientist observes a cell with a nucleus, mitochondria, and a cell wall made of cellulose. Which type of cell is being observed?

Accepted Answer

Plant cell

Question 4

Which of the following is NOT a component of the endomembrane system?

Accepted Answer

Mitochondrion

Question 5

Which evidence supports the endosymbiotic theory for the origin of mitochondria and chloroplasts?

Accepted Answer

Both organelles contain their own circular DNA similar to prokaryotes.

Question 6

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

Accepted Answer

It is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly.

Question 7

A mutation disrupts the function of lysosomes in a cell. Which process would be most directly affected?

Accepted Answer

Intracellular digestion of macromolecules

Question 8

Which of the following correctly matches the cytoskeletal component with its function?

Accepted Answer

Microtubules: movement of chromosomes during cell division

Question 9

Which cell junction allows for the direct exchange of ions and small molecules between adjacent animal cells?

Accepted Answer

Gap junction

Question 10

A cell is observed to have an extensive network of smooth endoplasmic reticulum. Which function is this cell likely specialized for?

Accepted Answer

Synthesis of lipids and detoxification of drugs

Question 11

Which of the following structures is unique to plant cells and is responsible for storing water, ions, and waste products?

Accepted Answer

Central vacuole

Question 12

Which of the following statements about the cell membrane is correct?

Accepted Answer

It is composed of a phospholipid bilayer with embedded proteins.

Question 13

Which organelle is responsible for converting the chemical energy stored in glucose into ATP in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 14

Which of the following best describes the function of peroxisomes?

Accepted Answer

Breakdown of fatty acids and detoxification of hydrogen peroxide

Question 15

Which structure in plant cells allows for communication and transport of materials between adjacent cells?

Accepted Answer

Plasmodesmata

Question 16

Which of the following is a function of the Golgi body?

Accepted Answer

Modification, sorting, and packaging of proteins and lipids for secretion or delivery to other organelles

Question 17

Which of the following structures is found in animal cells but not in plant cells?

Accepted Answer

Lysosome

Question 18

A cell is observed to have a large number of cilia on its surface. Which function is this cell most likely specialized for?

Accepted Answer

Movement of fluid or particles across the cell surface

Question 19

Which of the following best describes chromatin?

Accepted Answer

A complex of DNA and proteins found in the nucleus

Question 20

Which of the following is a key difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles, while prokaryotic cells do not.

Cell Structures and Functions: Study Guide

Study Guide - Practice Questions