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

$$ \text{Water moves from} \rightarrow \text{lower solute concentration to higher solute concentration} $$

Question 1

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

Accepted Answer

A dynamic structure with proteins bobbing in a fluid bilayer of phospholipids.

Question 2

Which type of molecule can most easily cross the lipid bilayer of the plasma membrane without the aid of a transport protein?

Accepted Answer

Hydrophobic (nonpolar) molecules such as hydrocarbons

Question 3

A red blood cell is placed in a hypotonic solution. What is the most likely outcome?

Accepted Answer

The cell will swell and may burst as water enters the cell.

Question 4

Which of the following statements about passive transport is correct?

Accepted Answer

It involves the movement of substances down their concentration gradient.

Question 5

A cell uses ATP to move sodium ions out of the cell and potassium ions into the cell. Which process is being described?

Accepted Answer

Active transport

Question 6

Which of the following best explains why ions such as Na$$ ^+ $$ and K$$ ^+ $$ require transport proteins to cross the plasma membrane?

Accepted Answer

They are charged and cannot pass through the hydrophobic interior of the membrane.

Question 7

Which of the following is a function of membrane proteins?

Accepted Answer

Facilitating cell-cell recognition

Question 8

A plant cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

It will become plasmolyzed as water leaves the cell.

Question 9

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

Accepted Answer

$$ 	ext{Water moves from} ightarrow 	ext{lower solute concentration to higher solute concentration} $$

Question 10

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient with the help of transport proteins

Question 11

A scientist observes that a certain protein spans the entire plasma membrane and is involved in transporting glucose into the cell. This protein is best classified as:

Accepted Answer

A transmembrane protein

Question 12

Which process is responsible for the uptake of cholesterol from the bloodstream into animal cells?

Accepted Answer

Receptor-mediated endocytosis

Question 13

Which of the following scenarios best illustrates cotransport?

Accepted Answer

The diffusion of H$$ ^+ $$ down its gradient drives the active transport of sucrose into the cell.

Question 14

Which of the following statements about exocytosis is correct?

Accepted Answer

It involves the fusion of vesicles with the plasma membrane to release contents outside the cell.

Question 15

A mutation causes a cell to lack functional carrier proteins for glucose. What is the most likely consequence?

Accepted Answer

Glucose will not be able to enter the cell efficiently.

Question 16

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

Accepted Answer

It allows some substances to cross more easily than others.

Question 17

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

Accepted Answer

DNA replication

Question 18

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

Accepted Answer

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

Question 19

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 gradient.

Question 20

Which of the following is an example of bulk transport?

Accepted Answer

Endocytosis of a bacterium by a white blood cell

Membrane Structure and Function (Chapter 7) – General Biology Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드