Question 1

Which of the following best describes the main advantage of a high surface-to-volume ratio in cells?

Accepted Answer

It allows for more efficient exchange of materials with the environment.

Question 2

A scientist wants to isolate mitochondria from a sample of animal cells. Which technique should they use, and why?

Accepted Answer

Cell fractionation, because it separates organelles based on size and density using centrifugation.

Question 3

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

Accepted Answer

Central vacuole

Question 4

Which of the following statements about the endosymbiont theory is correct?

Accepted Answer

Mitochondria and chloroplasts originated from free-living prokaryotes that were engulfed by ancestral eukaryotic cells.

Question 5

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

Accepted Answer

Movement of cilia and flagella

Question 6

Which of the following best explains why lysosomal enzymes are most active at low pH?

Accepted Answer

The acidic environment inside lysosomes optimizes the activity of hydrolytic enzymes.

Question 7

Which of the following is a function of the smooth endoplasmic reticulum (ER)?

Accepted Answer

Synthesis of lipids

Question 8

A cell is observed to have a large number of ribosomes attached to its endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Production of secretory proteins

Question 9

Which of the following equations correctly represents the calculation for the surface-to-volume ratio of a cube-shaped cell?

Accepted Answer

$$\frac{6s^2$}{s^3$}$$

Question 10

Which of the following best describes the role of the extracellular matrix (ECM) in animal cells?

Accepted Answer

It provides structural support and mediates communication between cells via integrins.

Question 11

A patient has a genetic disorder that affects the formation of intermediate filaments. Which of the following cellular processes is most likely to be impaired?

Accepted Answer

Maintaining cell shape and anchoring organelles

Question 12

Which of the following statements about plasmodesmata is correct?

Accepted Answer

They are channels that allow water and small solutes to pass between adjacent plant cells.

Question 13

Which organelle is responsible for modifying, sorting, and packaging proteins for secretion?

Accepted Answer

Golgi apparatus

Question 14

A freshwater protist is observed to have a contractile vacuole. What is the primary function of this organelle?

Accepted Answer

Pumping excess water out of the cell

Question 15

Which of the following best explains why mitochondria have a highly folded inner membrane?

Accepted Answer

To increase the surface area for enzymes that synthesize ATP

Question 16

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

Accepted Answer

Mitochondrion

Question 17

A mutation prevents the formation of tight junctions in epithelial cells. Which of the following is a likely consequence?

Accepted Answer

Leakage of extracellular fluid between cells

Question 18

Which of the following best describes the function of peroxisomes?

Accepted Answer

They produce hydrogen peroxide and convert it to water.

Question 19

Which of the following is a correct statement about the cytoskeleton?

Accepted Answer

It provides tracks for vesicle movement and helps maintain cell shape.

Question 20

Which of the following best explains why a cell is considered greater than the sum of its parts?

Accepted Answer

Cellular functions depend on the integration and coordination of all organelles and structures.

Cell Structure and Function: A Comprehensive Overview

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