Question 1

Which of the following best describes the function of the plasma membrane in a typical eukaryotic cell?

Accepted Answer

It separates intracellular and extracellular environments, regulates ion concentrations, and maintains membrane potential.

Question 2

A cell is placed in a hypertonic solution. What is the most likely outcome for the cell?

Accepted Answer

The cell will shrink due to water leaving the cell (crenation).

Question 3

Which organelle is primarily responsible for ATP synthesis in eukaryotic cells?

Accepted Answer

Mitochondria

Question 4

A mutation in the gene coding for a channel protein leads to cystic fibrosis. What is the primary cellular defect caused by this mutation?

Accepted Answer

Defective transport of ions across the plasma membrane

Question 5

Which of the following best explains the difference between facilitated diffusion and active transport?

Accepted Answer

Facilitated diffusion moves molecules down their concentration gradient without energy input, while active transport moves molecules against their gradient using ATP.

Question 6

Which formula correctly represents the calculation of osmotic pressure ($$\Pi) $$using van't Hoff's law?

Accepted Answer

$$\Pi = iCRT$$

Question 7

A cell uses a Na$$^+/K$^+$$ ATPase pump to maintain its membrane potential. Which statement best describes the action of this pump?

Accepted Answer

It moves Na$$^+$$ out of the cell and K$$^+$$ into the cell against their concentration gradients using ATP.

Question 8

Which of the following is a function of the Golgi apparatus in a cell?

Accepted Answer

Modification, packaging, and distribution of proteins and lipids

Question 9

During transcription, which base pairs with adenine (A) in the newly synthesized mRNA strand?

Accepted Answer

Uracil (U)

Question 10

Which process involves the internalization of large particles, such as bacteria, by a cell?

Accepted Answer

Phagocytosis

Question 11

A cell is observed to have many microvilli on its surface. What is the most likely function of this cell?

Accepted Answer

Increasing surface area for absorption

Question 12

Which of the following statements about carrier proteins is correct?

Accepted Answer

Carrier proteins can become saturated when all binding sites are occupied.

Question 13

Which organelle contains enzymes that break down and recycle proteins within the cell?

Accepted Answer

Proteasome

Question 14

Which of the following best describes the role of integrins in the plasma membrane?

Accepted Answer

They attach cells to extracellular molecules and sometimes allow communication.

Question 15

Which of the following is true regarding the movement of water during osmosis?

Accepted Answer

Water moves from an area of low solute concentration to high solute concentration.

Question 16

Which cellular structure is responsible for organizing spindle fibers during cell division?

Accepted Answer

Centrioles

Question 17

A patient is given a drug that blocks voltage-gated ion channels in neurons. What is the most likely effect on cellular function?

Accepted Answer

Impaired generation and transmission of electrical signals

Question 18

Which process is responsible for the expulsion of accumulated vesicle secretions from a cell, such as the release of digestive enzymes by the pancreas?

Accepted Answer

Exocytosis

Question 19

During DNA replication, what is the result of semiconservative replication?

Accepted Answer

Two DNA molecules, each with one old and one new strand

Question 20

Which of the following best describes the function of ribosomes in the cell?

Accepted Answer

Site of protein synthesis

Cell Biology and Genetics: Structure and Function of the Cell

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