Question 1

Which of the following best describes the function of the nuclear pore complex in a eukaryotic cell?

Accepted Answer

It regulates the movement of molecules into and out of the nucleus.

Question 2

A protein destined for the nucleus must contain which of the following to be properly imported?

Accepted Answer

A nuclear localization signal (NLS)

Question 3

Which of the following best explains why proteins synthesized in the cytosol can be directed to the endoplasmic reticulum (ER)?

Accepted Answer

They contain a 20-amino acid ER signal sequence that is recognized by a signal recognition particle.

Question 4

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

Accepted Answer

Packaging DNA into chromosomes

Question 5

A mutation that disrupts the nuclear localization signal (NLS) of a protein would most likely result in which of the following?

Accepted Answer

The protein remains in the cytosol and cannot enter the nucleus.

Question 6

Which of the following best describes the difference between eukaryotic cilia and flagella?

Accepted Answer

Cilia are short and numerous, while flagella are long and usually singular.

Question 7

The '9+2' arrangement refers to the structure of which cellular components?

Accepted Answer

Eukaryotic cilia and flagella

Question 8

A researcher adds a fluorescent tag to a protein with an ER signal sequence and observes its movement in a cell. Which pathway will the protein most likely follow?

Accepted Answer

Cytosol → ER → Golgi apparatus → Plasma membrane

Question 9

Which of the following best explains how the nuclear envelope contributes to gene regulation?

Accepted Answer

By controlling the import and export of regulatory proteins and RNA through nuclear pores

Question 10

A cell is observed to have defective movement due to a mutation affecting the links between microtubules in its flagella. Which cellular process is most likely impaired?

Accepted Answer

The generation of force for cell motility

Question 11

Which of the following equations best represents the number of possible combinations for a protein with a 20-amino acid ER signal sequence, if there are 20 different amino acids?

Accepted Answer

$$20^{20}$$

Question 12

If a protein is synthesized in the cytosol and lacks both an ER signal sequence and a nuclear localization signal, where is it most likely to remain?

Accepted Answer

In the cytosol

Question 13

Which of the following best describes the role of the Golgi apparatus in the endomembrane system?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles.

Question 14

A scientist observes that a certain protein is present in the nucleus but not in the cytosol. Which of the following is the most likely explanation?

Accepted Answer

The protein contains a nuclear localization signal (NLS).

Question 15

Which of the following scenarios best illustrates the importance of the signal recognition particle (SRP) in protein targeting?

Accepted Answer

A protein with an ER signal sequence is recognized by SRP and directed to the ER membrane for insertion.

Question 16

If a cell's nuclear pores were blocked, which of the following processes would be most directly affected?

Accepted Answer

The transport of mRNA from the nucleus to the cytosol

Question 17

Which of the following best explains why eukaryotic flagella and cilia can generate movement?

Accepted Answer

Motor proteins move along microtubules, generating forces that bend the structures.

Question 18

A patient has a genetic disorder that prevents the assembly of the '9+2' microtubule arrangement. Which of the following symptoms would you most likely expect?

Accepted Answer

Impaired movement of cilia and flagella, leading to respiratory and reproductive issues

Eukaryotic Cell Structure and Protein Trafficking

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