Question 1

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

Accepted Answer

It synthesizes ribosomal RNA (rRNA) and assembles ribosome subunits.

Question 2

What is the main role of nuclear pores in the nuclear envelope?

Accepted Answer

They allow the selective exchange of materials between the nucleus and cytoplasm.

Question 3

A scientist observes that a certain protein is synthesized by ribosomes attached to the rough endoplasmic reticulum (RER). What is the most likely destination of this protein?

Accepted Answer

It will be exported out of the cell or inserted into the cell membrane.

Question 4

Which of the following statements correctly distinguishes between free ribosomes and bound ribosomes?

Accepted Answer

Free ribosomes synthesize proteins that function in the cytosol, while bound ribosomes synthesize proteins for membranes or export.

Question 5

If a mutation caused the nuclear envelope to lack nuclear pores, which cellular process would be most directly affected?

Accepted Answer

Transport of mRNA from the nucleus to the cytoplasm.

Question 6

A cell is observed to have an abnormally large nucleolus. Which of the following is the most likely explanation for this observation?

Accepted Answer

The cell is producing large amounts of ribosomal RNA to support increased protein synthesis.

Question 7

Which structure forms the boundary of the nucleus and is continuous with the endoplasmic reticulum?

Accepted Answer

Nuclear envelope

Question 8

A researcher treats cells with a drug that prevents ribosomes from attaching to the rough endoplasmic reticulum. Which of the following would most likely result?

Accepted Answer

Proteins destined for secretion would not be properly synthesized.

Question 9

Which of the following best explains why proteins synthesized by free ribosomes remain in the cytosol?

Accepted Answer

They lack a signal sequence that directs them to the endoplasmic reticulum.

Question 10

During which process does mRNA exit the nucleus through nuclear pores to be translated in the cytoplasm?

Accepted Answer

Gene expression

Question 11

A mutation in a cell causes the nuclear envelope to become impermeable. Which of the following would be the most immediate consequence?

Accepted Answer

mRNA would not be able to reach the cytoplasm for translation.

Question 12

Which of the following best describes the relationship between the nuclear envelope and the rough endoplasmic reticulum (RER)?

Accepted Answer

The outer membrane of the nuclear envelope is continuous with the membrane of the RER.

Question 13

Which of the following is NOT a function of the nuclear envelope?

Accepted Answer

Synthesizing ribosomal RNA

Question 14

A cell is observed to have many ribosomes attached to its rough endoplasmic reticulum. What can you infer about this cell's function?

Accepted Answer

It is actively synthesizing proteins for export or for use in membranes.

Question 15

Which of the following best explains why the nuclear envelope contains pores?

Accepted Answer

To allow the regulated exchange of materials such as RNA and proteins between the nucleus and cytoplasm.

Cell Nucleus and Ribosomes: Structure and Function

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