Question 1

Which of the following best explains why cells must remain small in size?

Accepted Answer

Because smaller cells have a higher surface area-to-volume ratio, allowing efficient exchange of materials with their environment.

Question 2

A scientist wants to observe the detailed surface texture of a hair. Which type of microscope should they use?

Accepted Answer

Scanning electron microscope

Question 3

Which of the following structures is present in both prokaryotic and eukaryotic cells?

Accepted Answer

Ribosomes

Question 4

Penicillin is effective against Gram-positive bacteria because it targets which cellular structure?

Accepted Answer

The thick peptidoglycan layer in the cell wall

Question 5

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

Accepted Answer

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

Question 6

A cell is observed to have a large number of lysosomes. Which function is this cell most likely specialized for?

Accepted Answer

Digestion of foreign material and worn-out organelles

Question 7

Which of the following is NOT a piece of evidence supporting the endosymbiosis theory for the origin of mitochondria and chloroplasts?

Accepted Answer

Both organelles are found in all prokaryotic cells.

Question 8

A patient presents with muscle weakness and excessive glycogen granules in the liver. Which organelle is most likely malfunctioning?

Accepted Answer

Organelle responsible for breaking down macromolecules (lysosome)

Question 9

Which of the following best describes the pathway of a protein destined for secretion from a eukaryotic cell?

Accepted Answer

Nucleus → rough ER → Golgi apparatus → transport vesicle → plasma membrane

Question 10

Which cytoskeletal component is primarily responsible for the movement of chromosomes during cell division?

Accepted Answer

Microtubules

Question 11

Why do antibiotics such as penicillin not harm human cells?

Accepted Answer

Human cells lack peptidoglycan cell walls, which are targeted by penicillin.

Question 12

Which of the following is a major structural difference between Gram-positive and Gram-negative bacteria?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer, while Gram-negative bacteria have an additional outer membrane.

Question 13

A cell treated with a drug that prevents actin polymerization would be unable to:

Accepted Answer

Perform amoeboid movement

Question 14

Which organelle is abundant in liver cells due to its role in detoxification?

Accepted Answer

Smooth endoplasmic reticulum

Question 15

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

Accepted Answer

Regulates what enters and exits the cell

Question 16

Which of the following is a consequence of a cell growing too large without dividing?

Accepted Answer

The surface area-to-volume ratio decreases, limiting efficient exchange of materials.

Question 17

Which of the following is NOT a function of the cytoskeleton?

Accepted Answer

Synthesizing proteins

Question 18

Which organelle is responsible for capturing light energy and converting it into chemical energy in plant cells?

Accepted Answer

Chloroplast

Question 19

Which of the following best describes the evolutionary origin of mitochondria according to the endosymbiosis theory?

Accepted Answer

Mitochondria originated from an ancestral prokaryote that was engulfed by a host cell.

Question 20

Which of the following cell structures would be most abundant in a sperm cell?

Accepted Answer

Flagella

Comprehensive Study Guidance for Cell Structure, Function, and Microscopy in General Biology

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