Question 1

Which of the following is a defining feature that distinguishes eukaryotic cells from prokaryotic cells (bacteria/archaea)?

Accepted Answer

Presence of a distinct nucleus surrounded by a nuclear envelope

Question 2

Which organelle is NOT considered part of the endomembrane system in eukaryotic cells?

Accepted Answer

Mitochondria

Question 3

A mutation disrupts the nuclear lamina in a cell. Which of the following consequences is most likely?

Accepted Answer

Loss of structural support for the nucleus

Question 4

Which statement best describes the function of the nucleolus?

Accepted Answer

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

Question 5

Which of the following best explains why eukaryotic cells can compartmentalize different biochemical reactions?

Accepted Answer

They possess membrane-bound organelles that create specialized environments

Question 6

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

Accepted Answer

Rough ER → Golgi apparatus → vesicle → plasma membrane

Question 7

Which of the following is TRUE regarding nuclear pore complexes (NPCs)?

Accepted Answer

They regulate the transport of molecules between the nucleus and cytoplasm

Question 8

Which signal sequence is required for a protein to be imported into the nucleus?

Accepted Answer

Nuclear Localization Signal (NLS)

Question 9

Which of the following best describes euchromatin in the nucleus?

Accepted Answer

Lightly packed DNA where genes are active and transcription occurs

Question 10

A cell is observed to have an extensive smooth endoplasmic reticulum (SER). Which function is this cell most likely specialized for?

Accepted Answer

Synthesis of lipids and detoxification of toxins

Question 11

Which evolutionary hypothesis explains the origin of the endomembrane system in eukaryotic cells?

Accepted Answer

It was derived from the plasma membrane of an ancestral eukaryote

Question 12

Which of the following organelles is responsible for the modification, sorting, and packaging of proteins for secretion?

Accepted Answer

Golgi apparatus

Question 13

If a cell's nuclear envelope is damaged, which process would be most directly affected?

Accepted Answer

Separation of hereditary material from the rest of the cell

Question 14

Which of the following statements about the endomembrane system is CORRECT?

Accepted Answer

It divides the cell into functional and structural compartments called organelles

Question 15

A scientist isolates a cell and finds that it contains both chloroplasts and a large central vacuole. What type of cell is this most likely?

Accepted Answer

Plant cell

Question 16

Which of the following best describes the role of vesicles in the endomembrane system?

Accepted Answer

Transport and breakdown of large molecule-containing particles

Question 17

Which organelle is primarily responsible for digesting and recycling cellular waste in eukaryotic cells?

Accepted Answer

Lysosome

Question 18

A cell is unable to export proteins to the extracellular space. Which of the following is the most likely cause?

Accepted Answer

Malfunctioning Golgi apparatus

Question 19

Which of the following is a function of the nuclear pore complex (NPC)?

Accepted Answer

Facilitates the entry and exit of proteins and RNA between the nucleus and cytoplasm

Question 20

Which of the following best describes heterochromatin?

Accepted Answer

Densely packed DNA where genes are inactive and transcription does not occur

Eukaryotic Cells: Structure, Function, and Evolution

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