Question 1

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

Accepted Answer

It acts as a selectively permeable barrier, regulating the movement of substances into and out of the cell.

Question 2

A scientist is studying a genetic disorder that affects the structure of nuclear pores. Which cellular process is most likely to be directly impaired?

Accepted Answer

Transport of mRNA from the nucleus to the cytoplasm

Question 3

Which of the following statements about the fluid-mosaic model of the plasma membrane is correct?

Accepted Answer

Integral proteins can span the entire membrane and may function as channels.

Question 4

A red blood cell is placed in a hypotonic solution. What will happen to the cell, and why?

Accepted Answer

It will swell and may burst because water moves into the cell by osmosis.

Question 5

Which of the following best explains why the sodium-potassium pump is considered an example of active transport?

Accepted Answer

It moves sodium and potassium ions against their concentration gradients using energy from ATP hydrolysis.

Question 6

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

Accepted Answer

Modifying, packaging, and distributing proteins and lipids

Question 7

A patient with cystic fibrosis has a mutation affecting chloride ion channels. Which type of membrane protein is directly affected?

Accepted Answer

Channel protein

Question 8

Which of the following best describes the process of facilitated diffusion?

Accepted Answer

Movement of molecules from high to low concentration via carrier or channel proteins, without ATP

Question 9

Which organelle is responsible for the majority of ATP production in a cell, and what is the main process that occurs there?

Accepted Answer

Mitochondrion; aerobic respiration (citric acid cycle and electron transport chain)

Question 10

A cell is exposed to a toxin that prevents the formation of spindle fibers. Which phase of the cell cycle will be directly affected?

Accepted Answer

Metaphase of mitosis

Question 11

Which of the following best describes the role of tRNA during translation?

Accepted Answer

It carries amino acids to the ribosome and matches its anticodon to the mRNA codon.

Question 12

Which of the following is a correct sequence of events for the synthesis and secretion of a glycoprotein?

Accepted Answer

Transcription in the nucleus → translation on rough ER → modification in the Golgi apparatus → secretion by exocytosis

Question 13

Which of the following best explains why a cell placed in a hypertonic solution will shrink?

Accepted Answer

Water moves out of the cell by osmosis.

Question 14

Which of the following is true regarding the genetic code?

Accepted Answer

AUG is the start codon and codes for methionine.

Question 15

Which of the following best describes the function of lysosomes?

Accepted Answer

They digest and recycle cellular debris and foreign material.

Question 16

A mutation prevents the removal of introns from pre-mRNA. What is the most likely consequence for the cell?

Accepted Answer

Nonfunctional or abnormal proteins will be produced due to incorrect mRNA processing.

Question 17

Which of the following best describes the difference between passive and active transport across the plasma membrane?

Accepted Answer

Passive transport moves substances down their concentration gradient, while active transport moves substances against their concentration gradient using ATP.

Question 18

Which cytoskeletal element is primarily responsible for the movement of cilia and flagella?

Accepted Answer

Microtubules

Question 19

Which of the following is a real-life example of receptor-mediated endocytosis?

Accepted Answer

Cholesterol uptake by liver cells via LDL receptors

Cell Biology: Structure and Function of the Cell

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