Question 1

Which of the following best describes the primary function of the nucleolus within a eukaryotic cell?

Accepted Answer

It is the site of ribosomal RNA (rRNA) synthesis and ribosomal subunit assembly.

Question 2

A mutation disrupts the nuclear lamina in a eukaryotic cell. Which of the following cellular processes is most likely to be directly affected?

Accepted Answer

Structural support of the nucleus

Question 3

Which of the following organelles is NOT considered part of the endomembrane system?

Accepted Answer

Mitochondria

Question 4

A protein destined for secretion from a eukaryotic cell will pass through which sequence of organelles?

Accepted Answer

Rough endoplasmic reticulum $$\rightarrow$$ Golgi apparatus $$\rightarrow$$ plasma membrane

Question 5

Which of the following statements about nuclear pore complexes is correct?

Accepted Answer

They are multiprotein complexes that regulate traffic between the cytoplasm and the nucleus.

Question 6

A cytosolic protein is engineered to include a nuclear localization signal (NLS). What is the most likely outcome?

Accepted Answer

The protein will be transported into the nucleus.

Question 7

Which of the following best explains why the membranes of the endomembrane system can fuse with each other?

Accepted Answer

They are composed of similar phospholipid bilayers.

Question 8

A researcher observes that a certain protein accumulates in the cytoplasm and fails to enter the nucleus. Which of the following is the most likely explanation?

Accepted Answer

The protein lacks a nuclear localization signal (NLS).

Question 9

Which of the following is a function of the endoplasmic reticulum (ER) in eukaryotic cells?

Accepted Answer

Synthesis of proteins and lipids

Question 10

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

Accepted Answer

Digesting and breaking down biomolecules

Question 11

Which of the following best describes the evolutionary hypothesis for the origin of the endomembrane system in eukaryotes?

Accepted Answer

It originated from infoldings of the plasma membrane.

Question 12

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

Accepted Answer

The rough ER is studded with ribosomes, while the smooth ER is not.

Question 13

A scientist is studying a eukaryotic cell that is unable to detoxify harmful substances. Which organelle is most likely malfunctioning?

Accepted Answer

Smooth endoplasmic reticulum

Question 14

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

Accepted Answer

Modification, sorting, and packaging of proteins and lipids for secretion or delivery to other organelles

Question 15

A mutation causes a defect in the nuclear envelope. Which of the following processes would be most directly affected?

Accepted Answer

Separation of the nuclear genome from the cytoplasm

Question 16

Which of the following is a real-world example of the importance of nuclear localization signals (NLS) in medicine?

Accepted Answer

Certain genetic diseases are caused by mutations that disrupt NLS, preventing essential proteins from entering the nucleus.

Question 17

Which of the following best explains why the nuclear envelope is considered part of the endomembrane system?

Accepted Answer

It is a double membrane that is continuous with the endoplasmic reticulum.

Question 18

A cell biologist is tracking the movement of a newly synthesized protein. Which of the following would indicate that the protein is being secreted via the endomembrane system?

Accepted Answer

The protein is found in vesicles moving from the Golgi apparatus to the plasma membrane.

Eukaryotic Cell Structure, Function, and Evolution: Study Guide

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