$$\text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \rightarrow 6 \text{CO}_2 + 6 \text{H}_2\text{O} + \text{ATP}$$

Question 1

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

Accepted Answer

Eukaryotic cells have a membrane-bound nucleus, while prokaryotic cells lack one.

Question 2

Which cellular structure is responsible for synthesizing proteins in both prokaryotic and eukaryotic cells?

Accepted Answer

Ribosome

Question 3

A scientist observes a cell with a thick peptidoglycan layer and no membrane-bound organelles. To which domain does this cell most likely belong?

Accepted Answer

Bacteria

Question 4

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles.

Question 5

Which organelle is primarily responsible for the breakdown of fatty acids and the detoxification of hydrogen peroxide?

Accepted Answer

Peroxisome

Question 6

A mutation disrupts the nuclear localization signal (NLS) of a protein. What is the most likely consequence?

Accepted Answer

The protein will not enter the nucleus and remain in the cytosol.

Question 7

Which of the following equations correctly represents the process of cellular respiration that occurs in mitochondria?

Accepted Answer

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

Question 8

Which cytoskeletal element is primarily responsible for muscle contraction and cytokinesis in animal cells?

Accepted Answer

Microfilaments (actin filaments)

Question 9

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 10

Which of the following best explains the endosymbiont theory for the origin of mitochondria and chloroplasts?

Accepted Answer

They originated as free-living prokaryotes that were engulfed by ancestral eukaryotic cells.

Question 11

Which of the following structures is unique to animal cells and is involved in organizing microtubules during cell division?

Accepted Answer

Centrosome with centrioles

Question 12

Which of the following is a function of the extracellular matrix (ECM) in animal cells?

Accepted Answer

It provides structural support and mediates cell signaling.

Question 13

A protein is synthesized in the rough ER and must be secreted from the cell. Which sequence correctly describes its path?

Accepted Answer

Rough ER → Golgi apparatus → plasma membrane

Question 14

Which of the following cell junctions prevents the leakage of extracellular fluid across a layer of epithelial cells?

Accepted Answer

Tight junction

Question 15

Which of the following statements about plasmids in prokaryotic cells is correct?

Accepted Answer

Plasmids are small, circular DNA molecules that can carry antibiotic resistance genes.

Question 16

Which of the following best describes the function of lysosomes in animal cells?

Accepted Answer

They digest macromolecules and recycle cellular components.

Question 17

Which cytoskeletal element is described as hollow tubes made of tubulin and is involved in chromosome movement during cell division?

Accepted Answer

Microtubules

Question 18

A mutation in a plant cell prevents the formation of plasmodesmata. What is the most likely effect?

Accepted Answer

The cell will have impaired communication with adjacent cells.

Question 19

Which of the following is a function of the central vacuole in plant cells?

Accepted Answer

Storage of water, waste products, and maintaining turgor pressure

Question 20

Which of the following best describes the role of motor proteins in the cell?

Accepted Answer

They move vesicles and organelles along cytoskeletal tracks using energy from ATP.

A Tour of the Cell: Structure, Function, and Diversity

Study Guide - Practice Questions