Question 1

Which of the following best describes the main difference between co-translational and post-translational transport of proteins in eukaryotic cells?

Accepted Answer

Co-translational transport involves the movement of a growing polypeptide into an organelle as it is being synthesized, whereas post-translational transport occurs after the protein is fully synthesized.

Question 2

A mutation prevents the formation of the nuclear pore complex in a eukaryotic cell. Which of the following processes would be directly affected?

Accepted Answer

Export of mRNA from the nucleus to the cytoplasm

Question 3

Which of the following is a function of the nuclear lamina in eukaryotic cells?

Accepted Answer

It provides structural support to the nuclear envelope.

Question 4

A scientist is studying the import of proteins into the nucleus. Which of the following must be true for a protein to be imported into the nucleus?

Accepted Answer

The protein must contain a nuclear localization signal (NLS).

Question 5

Which of the following best explains why mRNA must be exported from the nucleus to the cytoplasm in eukaryotic cells?

Accepted Answer

Translation of mRNA into protein occurs in the cytoplasm.

Question 6

A drug inhibits the function of the nuclear pore complex. Which of the following would most likely be observed in a cell treated with this drug?

Accepted Answer

Accumulation of mRNA in the nucleus

Question 7

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells contain internal membrane-bound organelles, while prokaryotic cells do not.

Question 8

A researcher observes that a certain protein is synthesized in the cytoplasm but functions in the nucleus. Which pathway does this protein most likely follow?

Accepted Answer

It is imported into the nucleus through the nuclear pore complex.

Question 9

Which of the following molecules must enter the nucleus for DNA and RNA synthesis to occur?

Accepted Answer

Nucleotides

Question 10

A cell is observed to have defective export of mRNA. Which cellular structure is most likely malfunctioning?

Accepted Answer

Nuclear pore complex

Question 11

Which of the following best describes the role of the nuclear envelope in eukaryotic cells?

Accepted Answer

It acts as a selective barrier, controlling the passage of molecules between the nucleus and cytoplasm.

Question 12

If a mutation disrupts the nuclear localization signal (NLS) of a protein, what is the most likely consequence?

Accepted Answer

The protein will remain in the cytoplasm and not enter the nucleus.

Question 13

Which of the following is NOT a function of the nuclear pore complex?

Accepted Answer

Catalyzing the synthesis of DNA

Question 14

A patient has a genetic disorder that affects the structure of the nuclear lamina. Which of the following cellular processes is most likely to be impaired?

Accepted Answer

Maintenance of nuclear shape and stability

Question 15

Which of the following best explains why eukaryotic cells require a nuclear pore complex, while prokaryotic cells do not?

Accepted Answer

Eukaryotic cells have a nuclear envelope that separates the nucleus from the cytoplasm.

Question 16

A protein is synthesized in the cytoplasm and must be transported into the mitochondria. Which type of transport is most likely involved?

Accepted Answer

Post-translational transport

Question 17

Which of the following equations best represents the energy requirement for active transport of proteins into the nucleus?

Accepted Answer

$$ \Delta G = \Delta G^0$ + RT \ln \left( \frac{[protein]_{in}}{[protein]_{out}} \right) $$

Question 18

A cell biologist is studying the import of nucleotides into the nucleus. Which structure must be functional for this process to occur?

Accepted Answer

Nuclear pore complex

Question 19

Which of the following scenarios best illustrates the integration of multiple cellular structures for gene expression in eukaryotic cells?

Accepted Answer

DNA is transcribed into mRNA in the nucleus, mRNA is exported through the nuclear pore complex, and proteins are synthesized in the cytoplasm.

Cellular Transport Mechanisms and Internal Cell Structures

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