Question 1

Which of the following best describes the function of ribosomes in eukaryotic cells?

Accepted Answer

They are the site of protein synthesis in the cell.

Question 2

The nuclear envelope is characterized by which of the following features?

Accepted Answer

It is composed of two membranes with nuclear pores.

Question 3

A mutation in the gene encoding lamin proteins would most likely affect which aspect of the nucleus?

Accepted Answer

The shape and structural organization of the nucleus.

Question 4

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

Accepted Answer

Regulating the passage of molecules through nuclear pores.

Question 5

If a cell is unable to produce ribosomal RNA (rRNA), which structure is most likely defective?

Accepted Answer

Nucleolus

Question 6

Which of the following equations correctly represents the hydrolysis of ATP by a motor protein during vesicle transport?

Accepted Answer

$$\mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{P_i}$$

Question 7

A scientist observes a cell with an irregularly shaped nucleus and altered gene expression. Which protein is most likely mutated?

Accepted Answer

Lamin A

Question 8

Which of the following best explains why the nucleus is referred to as the 'information center' of the cell?

Accepted Answer

It contains DNA and associated proteins that regulate gene expression.

Question 9

Which of the following statements about the nucleolus is correct?

Accepted Answer

It is responsible for assembling ribosomal subunits.

Question 10

A cell biologist is studying a disease in which ribosome assembly is impaired. Which nuclear structure should they focus on?

Accepted Answer

Nucleolus

Question 11

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

Accepted Answer

The nuclear envelope is continuous with the rough ER.

Question 12

Which of the following would most likely result from a defect in nuclear pore complexes?

Accepted Answer

Impaired transport of proteins and RNA between the nucleus and cytoplasm.

Question 13

Which of the following is a correct sequence of structures that a newly synthesized protein destined for secretion would pass through?

Accepted Answer

Rough ER → Transport vesicle → Golgi apparatus → Plasma membrane

Question 14

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

Accepted Answer

To allow the passage of ribosomal subunits and mRNA between the nucleus and cytoplasm.

Question 15

If a mutation prevents the formation of the nuclear lamina, which of the following is a likely consequence?

Accepted Answer

The nucleus will lose its shape and chromatin organization will be disrupted.

Question 16

Which of the following is a function of the chromatin found in the nucleus?

Accepted Answer

It stores genetic information and regulates gene expression.

Question 17

A researcher is studying a protein that is synthesized in the cytosol but functions in the nucleus. Which of the following must this protein contain to enter the nucleus?

Accepted Answer

A nuclear localization signal (NLS)

Question 18

Which of the following best describes the role of the nucleoplasm?

Accepted Answer

It is the fluid inside the nucleus that contains chromatin and nucleolus.

Question 19

Which of the following is a key difference between the plasma membrane and the nuclear envelope?

Accepted Answer

The nuclear envelope consists of two membranes, while the plasma membrane is a single membrane.

Question 20

Which of the following best explains why ribosomes are not considered organelles?

Accepted Answer

They are not surrounded by a membrane.

Eukaryotic Cell Structure and Function

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