Question 1

Which of the following best describes the function of cholesterol in the plasma membrane?

Accepted Answer

It immobilizes the first few hydrocarbon groups of phospholipids, making the bilayer less deformable.

Question 2

A patient presents with a genetic defect affecting connexin proteins. Which cellular structure is most likely to be impaired?

Accepted Answer

Gap junctions

Question 3

Which tissue type is primarily responsible for forming boundaries between different environments and is involved in absorption and secretion?

Accepted Answer

Epithelial tissue

Question 4

The fluid mosaic model of the cell membrane, proposed by Singer and Nicolson, describes the membrane as:

Accepted Answer

A two-dimensional fluid of freely diffusing lipids with embedded proteins.

Question 5

Which of the following equations best represents the relationship between membrane permeability ($$P$$), membrane thickness ($$d$$), and diffusion coefficient ($$D$$)?

Accepted Answer

$$P = \frac{D}{d}$$

Question 6

A researcher observes that a certain cell type has abundant rough endoplasmic reticulum (RER) and ribosomes. What is the most likely function of this cell?

Accepted Answer

Protein synthesis for export

Question 7

Which cell junction is most important for preventing the movement of substances between cells in the blood-brain barrier?

Accepted Answer

Tight junctions

Question 8

If the temperature of a cell membrane increases, what is the most likely effect on the phospholipid bilayer?

Accepted Answer

The bilayer 'melts' and becomes more fluid, allowing molecules to move more freely.

Question 9

Which organelle is directly connected to the outer membrane of the nuclear envelope and is involved in protein and lipid synthesis?

Accepted Answer

Endoplasmic reticulum

Question 10

A mutation disrupts the function of dynein motor proteins in a neuron. Which process would be most affected?

Accepted Answer

Retrograde transport of vesicles from the periphery towards the nucleus

Question 11

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

Accepted Answer

Synthesizing proteins for export

Question 12

Endothelial cells lining blood vessels are a specialized form of which tissue type?

Accepted Answer

Epithelial tissue

Question 13

Which cytoskeletal element is primarily responsible for maintaining cell shape and facilitating intracellular transport?

Accepted Answer

Microtubules

Question 14

A patient with a skin blistering disorder is found to have defective desmosomes. What is the primary role of desmosomes?

Accepted Answer

Anchoring cells to each other for structural stability

Question 15

Which of the following best explains why the lumen of the digestive tract is considered part of the external environment?

Accepted Answer

Substances in the lumen have not yet crossed the epithelial barrier into the internal environment.

Question 16

Which equation correctly represents the calculation of the surface area ($$A) of a $$spherical cell with radius $$r$$?

Accepted Answer

$$A = 4 \pi r^2$

Question 17

Which tissue type is responsible for internal communication within the body?

Accepted Answer

Nervous tissue

Question 18

A cell is observed to have a large number of mitochondria. What is the most likely function of this cell?

Accepted Answer

Energy production through ATP synthesis

Question 19

Which of the following is a real-life consequence of defective tight junctions in the intestinal epithelium?

Accepted Answer

Uncontrolled passage of substances between cells, leading to leaky gut syndrome

Question 20

Which of the following best describes the role of the Golgi apparatus in a secretory cell?

Accepted Answer

Modification and packaging of proteins for export

Compartmentation: Cells and Tissues – Study Notes for Animal Physiology (BIO 360)

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