Question 1

Which of the following best explains why the plasma membrane is described as a 'fluid mosaic' model?

Accepted Answer

Because it consists of a flexible lipid bilayer with proteins embedded throughout, allowing lateral movement.

Question 2

A patient is diagnosed with a genetic disorder that affects the structure of desmosomes. Which tissue is most likely to be affected, and what symptom might result?

Accepted Answer

Epithelial tissue; increased skin blistering due to reduced cell adhesion.

Question 3

Which of the following is a function of the glycocalyx on the plasma membrane?

Accepted Answer

Acts as a specific biological marker for cell-to-cell recognition.

Question 4

Which equation best represents the process of cellular respiration occurring in mitochondria?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP$$

Question 5

A scientist observes that a certain cell type has abundant smooth endoplasmic reticulum (ER). Which function is this cell most likely specialized for?

Accepted Answer

Lipid metabolism and detoxification of drugs.

Question 6

Which of the following best describes the role of peroxisomes in the cell?

Accepted Answer

They use oxidases and catalase to detoxify harmful substances, such as hydrogen peroxide.

Question 7

A mutation causes a cell to lack functional tight junctions. Which of the following is a likely consequence?

Accepted Answer

Uncontrolled passage of water and solutes between adjacent cells.

Question 8

Which of the following statements about membrane proteins is correct?

Accepted Answer

Integral proteins are embedded within the membrane and can function as channels or enzymes.

Question 9

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

Accepted Answer

It allows certain molecules to cross while restricting others based on size, charge, and solubility.

Question 10

A cell is placed in a solution and water moves into the cell, causing it to swell. Which type of solution is the cell in, and what is the process called?

Accepted Answer

Hypotonic; osmosis

Question 11

Which of the following best describes the function of ribosomes?

Accepted Answer

They are the site of protein synthesis.

Question 12

Which of the following is a correct sequence for the pathway of a protein destined for secretion from the cell?

Accepted Answer

Rough ER $$\rightarrow$$ Golgi apparatus $$\rightarrow$$ secretory vesicle $$\rightarrow$$ plasma membrane

Question 13

Which cytoskeletal element is primarily responsible for resisting tension and maintaining cell shape?

Accepted Answer

Intermediate filaments

Question 14

A researcher observes that a cell has a large number of mitochondria. What can be inferred about the cell's function?

Accepted Answer

It requires large amounts of energy for its activities.

Question 15

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, concentrates, and packages proteins and lipids received from the rough ER.

Question 16

Which of the following is a correct description of the nucleus?

Accepted Answer

It contains the cell's DNA and acts as the control center for cellular activities.

Question 17

Which of the following best explains the role of the cytoskeleton in a cell?

Accepted Answer

It provides structural support, enables cell movement, and assists in intracellular transport.

Question 18

A cell is observed to have a high number of lysosomes. Which function is this cell most likely specialized for?

Accepted Answer

Digestion of bacteria and cellular debris

Question 19

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

Accepted Answer

Passive transport does not require energy, while active transport requires ATP to move substances against their concentration gradient.

Question 20

Which of the following best describes the function of gap junctions?

Accepted Answer

They allow ions and small molecules to pass directly from one cell to another, facilitating communication.

Cell Structure: Anatomy & Physiology Study Notes

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