Q: Which equation best represents the net movement of water during osmosis?

$$ \\text{Water moves from regions of high } \\Psi_{water} \\text{ to low } \\Psi_{water} $$

Q: A cell uses ATP to pump sodium ions out and potassium ions in. Which equation best represents this process?

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

Question 1

Which of the following best describes the process of osmosis?

Accepted Answer

The movement of water molecules from an area of high concentration to an area of low concentration through a semipermeable membrane.

Question 2

A red blood cell is placed in a hypertonic solution. What will happen to the cell, and why?

Accepted Answer

It will shrink because water leaves the cell by osmosis.

Question 3

Which of the following transport mechanisms requires energy input from the cell?

Accepted Answer

Active transport

Question 4

Glucose molecules are transported into cells against their concentration gradient. Which process is responsible for this?

Accepted Answer

Active transport

Question 5

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules through the membrane using carrier proteins, without energy input.

Question 6

A plant cell is placed in a hypotonic solution. What is the expected outcome?

Accepted Answer

The cell will swell and become turgid.

Question 7

Which of the following is NOT a type of passive transport?

Accepted Answer

Endocytosis

Question 8

Which statement correctly distinguishes between carrier proteins and channel proteins?

Accepted Answer

Carrier proteins bind to specific molecules and change shape to transport them across the membrane, while channel proteins form pores for molecules to pass through.

Question 9

Which process is used by white blood cells to engulf bacteria?

Accepted Answer

Phagocytosis

Question 10

A cell is placed in an isotonic solution. What will happen to the cell?

Accepted Answer

It will remain the same size because water movement is balanced.

Question 11

Which of the following molecules can most easily cross the plasma membrane by simple diffusion?

Accepted Answer

Small nonpolar molecules

Question 12

Which equation best represents the net movement of water during osmosis?

Accepted Answer

$$ \text{Water moves from regions of high } \Psi_{water} \text{ to low } \Psi_{water} $$

Question 13

Which of the following is an example of receptor-mediated endocytosis?

Accepted Answer

A cell taking in cholesterol molecules bound to LDL receptors.

Question 14

Which of the following best explains why ions cannot easily cross the plasma membrane by simple diffusion?

Accepted Answer

Ions are charged and the membrane interior is hydrophobic.

Question 15

Which process is responsible for the release of neurotransmitters from nerve cells?

Accepted Answer

Exocytosis

Question 16

A cell uses ATP to pump sodium ions out and potassium ions in. Which equation best represents this process?

Accepted Answer

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

Question 17

Which of the following statements about active transport is correct?

Accepted Answer

Active transport requires energy, usually in the form of ATP.

Question 18

Which scenario best illustrates the concept of turgor pressure in plant cells?

Accepted Answer

A plant cell in a hypotonic solution gains water and becomes turgid.

Question 19

Which of the following is a multi-step process involving both passive and active transport?

Accepted Answer

Sodium ions enter the cell by simple diffusion and are pumped out by active transport.

Question 20

Which of the following best describes the difference between phagocytosis and receptor-mediated endocytosis?

Accepted Answer

Phagocytosis engulfs large particles or cells, while receptor-mediated endocytosis targets specific molecules using receptors.

Cell Membrane Transport Mechanisms: Study Guide

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