Question 1

Which of the following best describes the function of the plasma membrane in human cells?

Accepted Answer

It serves as a flexible boundary, selectively allowing communication and transport between intracellular and extracellular environments.

Question 2

Which component of the cell is primarily responsible for containing the genetic material?

Accepted Answer

Nucleus

Question 3

A scientist observes a cell with a high number of transport proteins embedded in its plasma membrane. What is the most likely function of these proteins?

Accepted Answer

They facilitate the movement of specific molecules across the membrane.

Question 4

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

Accepted Answer

Because proteins and lipids move freely within the membrane, creating a dynamic and flexible boundary.

Question 5

Which type of cell junction is most likely to be found between epithelial cells lining the digestive tract, preventing leakage of fluids?

Accepted Answer

Tight junctions

Question 6

A patient is diagnosed with a heart condition where cells are unable to withstand mechanical stress. Which cell junction is most likely defective?

Accepted Answer

Desmosomes

Question 7

Which of the following processes requires energy input from ATP to move substances across the plasma membrane?

Accepted Answer

Active transport

Question 8

A cell is placed in a solution with a lower solute concentration than its cytoplasm. What will happen to the cell?

Accepted Answer

Water will flow into the cell, causing it to swell and possibly burst.

Question 9

Which equation best represents the movement of water during osmosis?

Accepted Answer

$$Water\ moves\ from\ areas\ of\ lower\ solute\ concentration\ to\ areas\ of\ higher\ solute\ concentration$$

Question 10

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

Accepted Answer

Synthesizing DNA

Question 11

Which type of passive transport involves the movement of hydrophobic substances directly through the phospholipid bilayer?

Accepted Answer

Simple diffusion

Question 12

A cell uses a carrier protein to move glucose down its concentration gradient. Which process is this an example of?

Accepted Answer

Facilitated diffusion

Question 13

Which of the following best describes the role of gap junctions in cardiac muscle cells?

Accepted Answer

They allow rapid communication by permitting ions and small molecules to pass directly from one cell to another.

Question 14

Which of the following statements about the lipid bilayer of the plasma membrane is correct?

Accepted Answer

It consists of two layers of phospholipids with hydrophobic tails facing each other and hydrophilic heads facing the aqueous environment.

Question 15

Which process involves the cell membrane surrounding and engulfing extracellular material to bring it into the cell?

Accepted Answer

Endocytosis

Question 16

A cell is exposed to a toxin that blocks all ATP production. Which transport processes will be immediately affected?

Accepted Answer

Active transport and exocytosis

Question 17

Which equation best describes the concentration gradient driving passive transport?

Accepted Answer

$$Substances\ move\ from\ areas\ of\ higher\ concentration\ to\ areas\ of\ lower\ concentration$$

Question 18

Which of the following is a real-life example of facilitated diffusion in human physiology?

Accepted Answer

Glucose entering muscle cells via glucose transporters

Question 19

A cell in a hypertonic solution will experience which of the following?

Accepted Answer

Water will leave the cell, causing it to shrink.

Question 20

Which of the following best describes the function of desmosomes?

Accepted Answer

They anchor adjacent cells together, providing resistance to mechanical stress.

Cell Structure and Membrane Transport: Study Notes for Anatomy & Physiology

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