Question 1

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

Accepted Answer

It is the site where ribosomal RNA is synthesized and ribosome subunits are assembled.

Question 2

A scientist observes a cell with a highly organized, double-membrane compartment containing a lattice-like sheet of fibrous proteins. Which structure is being described?

Accepted Answer

Nucleus

Question 3

Which of the following statements about ribosomes is correct?

Accepted Answer

Ribosomes are not surrounded by a membrane and are the site of protein synthesis.

Question 4

Proteins destined to be secreted from a eukaryotic cell are most likely to be synthesized by:

Accepted Answer

Ribosomes attached to the rough endoplasmic reticulum

Question 5

Which of the following is a function of the smooth endoplasmic reticulum (SER)?

Accepted Answer

Synthesis and breakdown of lipids, and storage of ions

Question 6

A mutation prevents the formation of the nuclear lamina in a cell. Which process would be most directly affected?

Accepted Answer

Structural support and organization of the nucleus

Question 7

Which of the following best explains why proteins synthesized on the rough ER are often found in the plasma membrane or secreted from the cell?

Accepted Answer

The rough ER directs proteins to the endomembrane system for further processing and sorting.

Question 8

Which of the following structures is present in plant cells but not in animal cells?

Accepted Answer

Chloroplast

Question 9

A cell is observed to have a large central vacuole, a cell wall, and chloroplasts. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 10

Which of the following best describes the fate of a protein synthesized by a free ribosome in the cytosol?

Accepted Answer

It remains in the cytosol or is imported into organelles such as the nucleus.

Question 11

Which of the following is NOT a function of the rough endoplasmic reticulum (RER)?

Accepted Answer

Synthesis of lipids

Question 12

A toxin that inhibits the enzymes of the smooth ER would most directly affect which cellular process?

Accepted Answer

Detoxification of harmful molecules

Question 13

Which of the following best explains why prokaryotic cells are generally much smaller than eukaryotic cells?

Accepted Answer

Prokaryotic cells lack compartmentalization, limiting their size due to surface area-to-volume constraints.

Question 14

Which of the following equations best represents the relationship between surface area (SA) and volume (V) for a spherical cell, and why is this relationship important for cell size?

Accepted Answer

$$SA = 4 \pi r^2$ and V$$ = \frac{4}{3} \pi $$r^3$$; as cells grow, volume increases faster than surface area, limiting efficient exchange with the environment.$

Question 15

A mutation causes a cell to lack ribosomes. Which process would be most directly affected?

Accepted Answer

Protein synthesis

Question 16

Which of the following best describes the role of the nuclear envelope?

Accepted Answer

It separates the contents of the nucleus from the cytoplasm and contains pore-like openings for molecular transport.

Question 17

A cell is exposed to a drug that prevents the folding of proteins in the rough ER. Which of the following outcomes is most likely?

Accepted Answer

Proteins destined for secretion or membrane insertion will be nonfunctional.

Question 18

Which of the following best explains why the smooth ER is abundant in liver cells?

Accepted Answer

Liver cells are involved in detoxification of drugs and poisons, a function of the smooth ER.

Question 19

Which of the following is a correct sequence of events for the synthesis and export of a secreted protein?

Accepted Answer

Ribosome on rough ER → protein folding in ER lumen → transport to Golgi apparatus → secretion via vesicle

Eukaryotic Cell Structure: Organization and Function

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