Question 1

Which of the following best describes the difference between cytosol and cytoplasm in a eukaryotic cell?

Accepted Answer

Cytosol is the jelly-like fluid that surrounds organelles, while cytoplasm includes cytosol, organelles, and cytoskeleton (excluding the nucleus).

Question 2

Which component of the plasma membrane is primarily responsible for maintaining membrane fluidity and forming lipid rafts for signaling?

Accepted Answer

Cholesterol

Question 3

A red blood cell is placed in a hypotonic solution. What is the most likely outcome?

Accepted Answer

The cell will swell and may burst (lyse) due to water influx.

Question 4

Which organelle is the site of ATP production and is directly affected by cyanide poisoning?

Accepted Answer

Mitochondrion

Question 5

Which of the following transport mechanisms requires energy from ATP hydrolysis to move substances against their concentration gradient?

Accepted Answer

Primary active transport

Question 6

A cell is exposed to a hypertonic solution. What will happen to the cell’s volume and why?

Accepted Answer

The cell’s volume will decrease because water leaves the cell by osmosis.

Question 7

Which equation best represents the relationship between osmotic pressure ($$\Pi$$), solute concentration ($$C$$), gas constant ($$R$$), and temperature ($$T$$)?

Accepted Answer

$$\Pi = CRT$$

Question 8

Which of the following is NOT a function of the plasma membrane?

Accepted Answer

DNA replication

Question 9

Which type of membrane protein is permanently embedded within the lipid bilayer and is crucial for transporting molecules and signal transduction?

Accepted Answer

Integral protein

Question 10

During secondary active transport, which process allows glucose to enter the cell against its concentration gradient?

Accepted Answer

Glucose is cotransported with Na+ as Na+ moves down its gradient.

Question 11

Which organelle is responsible for synthesizing ribosomal RNA and assembling ribosomes?

Accepted Answer

Nucleolus

Question 12

Which of the following best describes the function of microvilli on the surface of intestinal epithelial cells?

Accepted Answer

Increase surface area for absorption

Question 13

Which process involves the engulfment of large solid particles by the cell, forming a vesicle called a phagosome?

Accepted Answer

Phagocytosis

Question 14

Which of the following is a function of the cytoplasm?

Accepted Answer

Protein synthesis and glycolysis

Question 15

A patient is diagnosed with a genetic disorder affecting the Na+-K+ ATPase pump. Which cellular process is most likely to be disrupted?

Accepted Answer

Maintenance of electrochemical gradients essential for nerve and muscle function

Question 16

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

Accepted Answer

Proteins and lipids can move laterally within the membrane, allowing flexibility and dynamic function.

Question 17

Which organelle is responsible for modifying, sorting, and packaging proteins for secretion or delivery to other organelles?

Accepted Answer

Golgi apparatus

Question 18

Which cytoskeletal element is composed of actin subunits and is involved in cell movement and shape changes?

Accepted Answer

Microfilaments

Question 19

Which of the following best explains why osmosis is critical for maintaining homeostasis in neurons?

Accepted Answer

Osmosis regulates cell volume, preventing swelling or shrinking that can disrupt neuronal function.

Question 20

Which of the following is a direct consequence of the mitochondrial theory of aging?

Accepted Answer

Decreased energy production by mitochondria weakens and ages cells.

Cellular Anatomy & Physiology: Structure and Function of Cells

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