Question 1

Which of the following best describes the function of the mitochondria in a eukaryotic cell?

Accepted Answer

They produce most of the cell's ATP via aerobic respiration.

Question 2

A patient is diagnosed with a rare disorder in which their cells cannot efficiently detoxify hydrogen peroxide ($$H_2O_2). $$Which organelle is most likely malfunctioning?

Accepted Answer

Peroxisome

Question 3

Which of the following statements about ribosomes is TRUE?

Accepted Answer

Ribosomes can be free in the cytosol or bound to the rough ER.

Question 4

A cell is observed to have an extensive network of smooth endoplasmic reticulum. Which function is this cell MOST likely specialized for?

Accepted Answer

Lipid metabolism and detoxification

Question 5

Which of the following best explains why compartmentalization by membranes is crucial for eukaryotic cell function?

Accepted Answer

It enables different metabolic processes to occur simultaneously in separate organelles.

Question 6

A genetic mutation causes a cell to lack the enzyme needed to break down glycolipids in the brain. Which disease is most likely present, and what is the consequence?

Accepted Answer

Tay-Sachs disease; accumulation of glycolipids interferes with nervous system function

Question 7

Which cytoskeletal element is primarily responsible for resisting pulling forces and is composed of tetramer fibrils twisted together?

Accepted Answer

Intermediate filaments

Question 8

During protein synthesis, which sequence of organelles and structures is correct for a protein destined for secretion from the cell?

Accepted Answer

Rough ER → Golgi apparatus → secretory vesicle → plasma membrane

Question 9

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

Accepted Answer

A double-membrane barrier with pores that regulate transport into and out of the nucleus

Question 10

A scientist observes a cell with numerous microvilli on its surface. What is the most likely function of this cell?

Accepted Answer

Increased absorption due to greater surface area

Question 11

Which of the following is a correct description of the '9 + 2' arrangement?

Accepted Answer

Nine pairs of microtubules surrounding two single microtubules in cilia and flagella

Question 12

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

Accepted Answer

It modifies, sorts, and packages proteins and lipids for delivery to their destinations.

Question 13

A cell is unable to move organelles and vesicles efficiently within its cytoplasm. Which structure is most likely defective?

Accepted Answer

Microtubules

Question 14

Which of the following is a function of lysosomes in a healthy cell?

Accepted Answer

Digesting nonfunctional organelles and foreign substances

Question 15

Which of the following best describes the composition of chromatin?

Accepted Answer

30% DNA, 60% histone proteins, 10% RNA

Question 16

A cell is observed to have a defective centrosome. Which of the following processes would be most directly affected?

Accepted Answer

Microtubule organization and cell division

Question 17

Which of the following is a correct match between a cytoskeletal element and its function?

Accepted Answer

Intermediate filaments: provide tensile strength and resist pulling forces

Question 18

Which of the following best describes the function of the nucleolus?

Accepted Answer

It is involved in ribosomal RNA synthesis and ribosome subunit assembly.

Question 19

A cell is exposed to a toxin that inhibits the function of motor proteins. Which process would be most directly impaired?

Accepted Answer

Movement of vesicles along microtubules

Question 20

Which of the following is a real-world example of the importance of lysosomal function in human health?

Accepted Answer

Lysosomal storage diseases, such as Tay-Sachs, result from defective lysosomal enzymes and lead to neurodegeneration.

Cell Structure and Function: Cytoplasm and Organelles

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