Question 1

Which of the following best describes the primary function of the nuclear lamina in eukaryotic cells?

Accepted Answer

It provides mechanical support and helps maintain the shape of the nucleus.

Question 2

A mutation disrupts the nuclear pore complex (NPC) in a neuron. Which cellular process is most likely to be directly affected?

Accepted Answer

Export of mRNA from the nucleus to the cytoplasm

Question 3

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

Accepted Answer

Peroxisome

Question 4

Which of the following best explains why the nucleolus is prominent in cells with high rates of protein synthesis?

Accepted Answer

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

Question 5

Which of the following statements about ribosomes is TRUE?

Accepted Answer

They are composed of protein and rRNA and are not membrane-bound.

Question 6

A secreted protein is synthesized by a ribosome attached to the rough ER. Which of the following best describes the correct pathway this protein will follow to be secreted from the cell?

Accepted Answer

Rough ER → Golgi apparatus → transport vesicle → plasma membrane

Question 7

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

Accepted Answer

Synthesis of lipids and detoxification of poisons

Question 8

Which of the following best describes the role of hydrolase enzymes in lysosomes?

Accepted Answer

They add water to macromolecules, breaking them down into smaller components.

Question 9

A plant cell loses water from its central vacuole. What is the most likely consequence?

Accepted Answer

The cell will wilt due to loss of turgor pressure.

Question 10

Which of the following is evidence supporting the endosymbiotic theory for the origin of mitochondria and chloroplasts?

Accepted Answer

They contain circular DNA and prokaryote-like ribosomes.

Question 11

Which event is thought to have occurred FIRST in the evolution of eukaryotic cells according to the endosymbiotic theory?

Accepted Answer

Engulfment of a proteobacterial ancestor

Question 12

Which of the following best describes the function of peroxisomes?

Accepted Answer

They compartmentalize oxidative reactions and detoxify hydrogen peroxide.

Question 13

Which cytoskeletal element is primarily responsible for maintaining the shape of the nucleus?

Accepted Answer

Intermediate filaments (nuclear lamina)

Question 14

A patient with tuberculosis has white blood cells containing large vesicles with living bacteria that persist for a long time. Which cellular process is most likely defective?

Accepted Answer

Fusion of phagocytic vesicles with lysosomes

Question 15

Which of the following antibiotics would most likely inhibit protein synthesis in prokaryotes but not in eukaryotes?

Accepted Answer

Tetracycline, which binds to the 30S subunit of prokaryotic ribosomes

Question 16

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

Accepted Answer

It modifies, sorts, and packages proteins and lipids for delivery to various destinations.

Question 17

Which of the following is a correct description of the difference between rough and smooth endoplasmic reticulum?

Accepted Answer

Rough ER has ribosomes attached and synthesizes proteins, while smooth ER lacks ribosomes and synthesizes lipids.

Question 18

Which of the following best describes the process of phagocytosis?

Accepted Answer

The cell engulfs large particles into a vacuole, which then fuses with a lysosome for digestion.

Question 19

Which of the following statements about mitochondria is TRUE?

Accepted Answer

They are the sites of cellular respiration and ATP production.

Question 20

Which of the following best describes the function of the nuclear pore complex (NPC)?

Accepted Answer

It controls the movement of molecules between the nucleus and cytoplasm.

Cell Structure and Function: The Nucleus, Ribosomes, and Endomembrane System

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