Q: Which equation correctly represents the direction of water movement during osmosis?

$\text{Water moves from: Low solute concentration} \rightarrow \text{High solute concentration}$

Question 1

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

Accepted Answer

A dynamic structure where proteins float in or on a fluid bilayer of phospholipids.

Question 2

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

Accepted Answer

It will swell and possibly burst because water will move into the cell by osmosis.

Question 3

Which type of molecule is LEAST likely to diffuse directly through the lipid bilayer of a plasma membrane?

Accepted Answer

Sodium ion (Na$^+$)

Question 4

A cell uses ATP to move potassium ions (K$^+$) into the cell against their concentration gradient. Which process is being described?

Accepted Answer

Active transport

Question 5

Which of the following best explains why integral membrane proteins are amphipathic?

Accepted Answer

They have both hydrophilic and hydrophobic regions, allowing them to span the membrane.

Question 6

A patient is given an intravenous solution that is hypertonic relative to their blood cells. What is the most likely effect on the patient's red blood cells?

Accepted Answer

The cells will shrink as water leaves the cells by osmosis.

Question 7

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It uses transport proteins to move substances down their concentration gradient.

Question 8

Which equation correctly represents the direction of water movement during osmosis?

Accepted Answer

$	ext{Water moves from: Low solute concentration} ightarrow 	ext{High solute concentration}$

Question 9

Which of the following is a function of membrane proteins?

Accepted Answer

Catalyzing chemical reactions, cell recognition, and signal transduction

Question 10

A cell is observed to engulf large particles by wrapping its plasma membrane around them and forming a vesicle. Which process is this?

Accepted Answer

Phagocytosis

Question 11

Which of the following best describes cotransport as seen in the plasma membrane?

Accepted Answer

The movement of one substance down its gradient drives the active transport of another substance against its gradient.

Question 12

Which of the following scenarios best illustrates selective permeability of the plasma membrane?

Accepted Answer

Only water and small nonpolar molecules can cross easily, while ions require transport proteins.

Question 13

A scientist observes that a certain protein spans the entire plasma membrane and is involved in signal transduction. What type of protein is this?

Accepted Answer

Transmembrane protein

Question 14

Which of the following best explains why hydrophobic molecules pass more easily through the plasma membrane than hydrophilic molecules?

Accepted Answer

The hydrophobic core of the membrane allows nonpolar molecules to dissolve and diffuse through.

Question 15

Which process requires the cell to expend energy to move substances across the plasma membrane?

Accepted Answer

Active transport

Question 16

A cell is placed in an isotonic solution. What will happen to the cell's volume over time?

Accepted Answer

It will remain the same because water moves in and out at equal rates.

Question 17

Which of the following is an example of bulk transport across the plasma membrane?

Accepted Answer

Exocytosis

Question 18

Which statement about carrier proteins is correct?

Accepted Answer

They bind to specific molecules and change shape to shuttle them across the membrane.

Question 19

A plant cell is placed in a hypertonic solution. What is the most likely outcome for the cell?

Accepted Answer

It will become plasmolyzed as water leaves the cell.

Question 20

Which of the following best describes the role of ATP in active transport?

Accepted Answer

ATP provides the energy needed to move substances against their concentration gradients.

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