Question 1

Which of the following best describes the arrangement of the plasma membrane according to the fluid mosaic model?

Accepted Answer

A fluid, dynamic structure with phospholipids and proteins moving laterally within the bilayer.

Question 2

A cell placed in a hypertonic solution will:

Accepted Answer

Lose water and shrink as water moves out of the cell.

Question 3

Which organelle is primarily responsible for producing ATP via oxidative catabolism?

Accepted Answer

Mitochondria

Question 4

During primary active transport, which equation best represents the energy requirement for moving ions against their concentration gradient?

Accepted Answer

$$ \Delta G = RT \ln \left( \frac{[C_{in}]}{[C_{out}]} \right) + zF\Delta \Psi $$

Question 5

Which of the following is NOT a function of the cytoskeleton?

Accepted Answer

Synthesizing proteins

Question 6

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

Accepted Answer

Formation of cilia and flagella

Question 7

Which process involves the movement of polar and ionic solutes across the plasma membrane with the help of a protein channel?

Accepted Answer

Facilitated diffusion

Question 8

During the cell cycle, DNA replication occurs in which phase?

Accepted Answer

S phase

Question 9

Which of the following best explains why the plasma membrane is selectively permeable?

Accepted Answer

It restricts movement based on the solute's polarity, size, and the presence of transport proteins.

Question 10

A patient is diagnosed with a genetic disorder affecting the Na+/K+ pump. Which of the following consequences is most likely?

Accepted Answer

Impaired maintenance of membrane potential, leading to disrupted nerve and muscle function.

Question 11

Which of the following is TRUE regarding osmosis?

Accepted Answer

Osmosis is a passive process where water moves from a region of lower solute concentration to higher solute concentration.

Question 12

Which organelle is responsible for modifying and packaging products for secretion or incorporation into the plasma membrane?

Accepted Answer

Golgi apparatus

Question 13

During translation, which molecule acts as the 'translator' by bringing specific amino acids to the ribosome?

Accepted Answer

tRNA

Question 14

Which of the following best describes semiconservative replication of DNA?

Accepted Answer

Each new DNA double helix contains one old strand and one new strand.

Question 15

A cell is observed to have an abundance of smooth ER. Which function is most likely enhanced in this cell?

Accepted Answer

Lipid synthesis and detoxification

Question 16

Which of the following structures increases the surface area of the plasma membrane for absorption?

Accepted Answer

Microvilli

Question 17

Which stage of mitosis is characterized by the alignment of chromosomes along the cell's equator?

Accepted Answer

Metaphase

Question 18

If a cell's lysosomes are nonfunctional, which of the following would most likely occur?

Accepted Answer

Accumulation of undigested substances and damaged organelles

Question 19

Which of the following best describes the role of checkpoints in the cell cycle?

Accepted Answer

They ensure that cell formation is balanced with cell death by acting as stop/go signals.

Question 20

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

Accepted Answer

Uptake of cholesterol by cells via LDL receptors

Chapter 3: The Cell – Structure, Function, and Processes

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