Question 1

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

Accepted Answer

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

Question 2

A scientist observes a cell with a double-membraned organelle that contains its own DNA and ribosomes. Which organelle is being described, and what is its primary function?

Accepted Answer

Mitochondrion; it produces ATP through cellular respiration.

Question 3

Which of the following best explains why the rough endoplasmic reticulum (RER) appears 'rough' under a microscope?

Accepted Answer

It is studded with ribosomes on its cytoplasmic surface.

Question 4

A mutation prevents the formation of transport vesicles from the Golgi apparatus. Which cellular process would be most directly affected?

Accepted Answer

Secretion of proteins to the extracellular space.

Question 5

Which of the following statements about lysosomes is correct?

Accepted Answer

They contain hydrolytic enzymes that digest macromolecules and recycle cellular components.

Question 6

A patient is diagnosed with Tay-Sachs disease, a disorder caused by the accumulation of undigested lipids in the brain. Which organelle is most likely malfunctioning?

Accepted Answer

Lysosome

Question 7

Which of the following best describes the cisternal maturation model of the Golgi apparatus?

Accepted Answer

Cisternae of the Golgi progress forward from the cis to the trans face, carrying and modifying cargo as they move.

Question 8

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

Accepted Answer

Synthesis of lipids, metabolism of carbohydrates, and detoxification of drugs and poisons.

Question 9

A cell is observed to have an extensive network of smooth endoplasmic reticulum. Which type of cell is this most likely to be, and why?

Accepted Answer

A liver cell, because it is involved in detoxification of drugs and poisons.

Question 10

Which of the following best explains the role of peroxisomes in eukaryotic cells?

Accepted Answer

They contain enzymes that transfer hydrogen from substrates to oxygen, producing hydrogen peroxide.

Question 11

A researcher is studying a protein that is synthesized in the rough ER and then secreted from the cell. Which sequence of organelles does this protein most likely pass through?

Accepted Answer

Rough ER → Golgi apparatus → transport vesicle → plasma membrane

Question 12

Which of the following best describes the function of ribosomes?

Accepted Answer

They synthesize proteins by translating messenger RNA.

Question 13

A cell is unable to produce sufficient ATP and shows signs of energy deficiency. Which organelle is most likely defective?

Accepted Answer

Mitochondrion

Question 14

Which of the following equations correctly represents the process of cellular respiration that occurs in mitochondria?

Accepted Answer

$\mathrm{C_6H_{12}O_6} + 6\ \mathrm{O_2} ightarrow 6\ \mathrm{CO_2} + 6\ \mathrm{H_2O} + 	ext{energy (ATP)}$

Question 15

Which of the following best explains why proteins destined for secretion are synthesized on the rough ER rather than free ribosomes?

Accepted Answer

The rough ER provides a pathway for proteins to enter the endomembrane system for modification and transport.

Question 16

A cell is observed to have a large central vacuole. Which type of cell is this most likely to be, and what is the primary function of this organelle?

Accepted Answer

Plant cell; storage of water, ions, and waste products.

Question 17

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

Accepted Answer

It separates the nucleus from the cytoplasm and regulates the passage of molecules.

Question 18

A protein is found to be improperly folded and nonfunctional after leaving the endoplasmic reticulum. Which organelle is responsible for further modifying and sorting this protein before it is secreted?

Accepted Answer

Golgi apparatus

Question 19

Which of the following best explains the difference between free ribosomes and bound ribosomes?

Accepted Answer

Free ribosomes synthesize proteins that function in the cytosol, while bound ribosomes synthesize proteins for secretion or for use in membranes.

Question 20

A cell is exposed to a toxin that disrupts the function of the Golgi apparatus. Which of the following processes would be most directly impaired?

Accepted Answer

Modification and sorting of proteins for secretion.

Cell Structure and Function: Eukaryotic Organelles and Cellular Processes

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