Q: Which of the following equations correctly represents the movement of sodium and potassium ions during the sodium-potassium pump?

$$2 \mathrm{K}^+_{\text{in}} + 3 \mathrm{Na}^+_{\text{out}}$$

Question 1

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

Accepted Answer

It is a selectively permeable boundary composed of a double layer of phospholipids with embedded proteins, allowing controlled movement of substances.

Question 2

Which organelle is primarily responsible for synthesizing proteins that are exported from the cell?

Accepted Answer

Rough endoplasmic reticulum

Question 3

A cell is placed in a solution with a lower concentration of solutes than the cytoplasm. Which process will most likely occur, and what is the expected result?

Accepted Answer

Osmosis; water will move into the cell, causing it to swell.

Question 4

Which of the following best explains why active transport requires energy?

Accepted Answer

It moves substances against their concentration gradient, from low to high concentration.

Question 5

Which cytoskeletal element is most important for resisting pulling forces within the cell?

Accepted Answer

Intermediate filaments

Question 6

A patient’s cells are unable to break down fatty acids and hydrogen peroxide efficiently. Which organelle is most likely malfunctioning?

Accepted Answer

Peroxisome

Question 7

Which of the following membrane junctions prevents the passage of molecules between adjacent cells in the digestive tract?

Accepted Answer

Tight junctions

Question 8

Which process involves the engulfing of large particles or macromolecules by the plasma membrane to form a vesicle?

Accepted Answer

Endocytosis

Question 9

Which organelle is responsible for packaging and modifying proteins for secretion?

Accepted Answer

Golgi apparatus

Question 10

A cell is observed to have many cilia on its surface. What is the most likely function of these cilia?

Accepted Answer

To move substances across the cell surface in a coordinated direction

Question 11

Which of the following best describes the role of the nucleolus?

Accepted Answer

It is the site of ribosomal RNA synthesis and ribosome assembly.

Question 12

Which of the following equations correctly represents the movement of sodium and potassium ions during the sodium-potassium pump?

Accepted Answer

$$2 \mathrm{K}^+_{	ext{in}} + 3 \mathrm{Na}^+_{	ext{out}}$$

Question 13

Which of the following is a function of lysosomes?

Accepted Answer

Digestion of worn-out organelles and cellular debris

Question 14

A cell is observed to have an extensive smooth endoplasmic reticulum. Which function is this cell most likely specialized for?

Accepted Answer

Lipid synthesis and detoxification

Question 15

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient with the help of a protein channel

Question 16

Which cytoskeletal element is primarily responsible for cell division and the movement of chromosomes?

Accepted Answer

Microtubules

Question 17

Which of the following is NOT a major part of all cells?

Accepted Answer

Cell wall

Question 18

A cell is observed to have many mitochondria. What does this suggest about the cell’s function?

Accepted Answer

It is specialized for energy production through aerobic respiration.

Question 19

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

Accepted Answer

They allow the passage of chemical substances between adjacent cells.

Question 20

Which of the following is a correct statement about the nucleus?

Accepted Answer

It contains the genetic material and controls cellular activities.

Cell Structure and Function: Plasma Membrane, Transport, Organelles, and Cytoskeleton

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