Question 1

Which of the following best explains why most cells are microscopic rather than macroscopic in size?

Accepted Answer

Small cells have a higher surface area to volume ratio, facilitating efficient exchange of materials with their environment.

Question 2

A scientist discovers a cell with the following characteristics: a circular chromosome, no membrane-bound organelles, and a cell wall. Which type of cell is this most likely to be?

Accepted Answer

Prokaryotic cell

Question 3

Which structure in prokaryotic cells allows them to adhere to surfaces such as catheters and human tissues, contributing to their pathogenicity?

Accepted Answer

Capsule

Question 4

Why are bacterial ribosomes a common target for antibiotics?

Accepted Answer

Bacterial ribosomes are structurally different from eukaryotic ribosomes, allowing antibiotics to target them without harming human cells.

Question 5

Which of the following is NOT a feature shared by both prokaryotic and eukaryotic cells?

Accepted Answer

Presence of membrane-bound organelles

Question 6

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

Accepted Answer

Plant cell

Question 7

Which organelle is responsible for the synthesis, modification, and packaging of secretory proteins in eukaryotic cells?

Accepted Answer

Golgi apparatus

Question 8

A patient is diagnosed with Tay-Sachs disease, which is caused by a missing lipid-digesting enzyme. Which organelle is primarily affected in this disease?

Accepted Answer

Lysosome

Question 9

Which of the following best describes the structure of the plasma membrane?

Accepted Answer

A bilayer of phospholipids with hydrophilic heads facing outward and hydrophobic tails facing inward

Question 10

Which equation correctly represents the relationship between surface area and volume for a cube-shaped cell with side length $$l$$?

Accepted Answer

$$\mathrm{Surface\ Area} = 6l^2$, $$\mathrm{Volume} = $$l^3$$

Question 11

Which organelle is the primary site of ATP synthesis in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 12

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

Accepted Answer

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

Question 13

Which of the following is a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Regulation of cell activity by transmitting signals from the cell surface to the interior

Question 14

Which type of cytoskeletal element is primarily responsible for cell division and the movement of organelles within the cell?

Accepted Answer

Microtubules

Question 15

A cell is observed to have a prominent nucleolus and a high proportion of bound ribosomes. What is this cell likely specialized for?

Accepted Answer

Protein secretion

Question 16

Which of the following molecules can easily pass through the hydrophobic interior of the plasma membrane without the aid of transport proteins?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 17

Which organelle is responsible for adding carbohydrate groups to proteins, forming glycoproteins?

Accepted Answer

Golgi apparatus

Question 18

Which of the following is a unique feature of plant cells compared to animal cells?

Accepted Answer

Presence of plasmodesmata

Question 19

Which of the following best describes the function of the rough endoplasmic reticulum (RER)?

Accepted Answer

Production of membrane phospholipids and proteins for secretion or membrane insertion

Question 20

Which of the following statements about mitochondria and chloroplasts is TRUE?

Accepted Answer

Both reproduce by splitting in half, similar to prokaryotes.

Cell Biology: Structure and Function of Cells

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