transport mechanism

Question 1

What is a concentration gradient?

Answer 1

A concentration gradient is the difference in the concentration of a substance between two areas.

Question 2

True or False: Molecules move from an area of lower concentration to an area of higher concentration in passive transport.

Answer 2

False

Question 3

Fill in the blank: In diffusion, substances move from areas of _____ concentration to areas of _____ concentration.

Answer 3

high, low

Question 4

What type of transport mechanism requires energy?

Answer 4

Active transport

Question 5

Multiple choice: Which of the following is an example of passive transport?
A) Endocytosis
B) Diffusion
C) Sodium-potassium pump
D) Exocytosis

Answer 5

B) Diffusion

Question 6

What is facilitated diffusion?

Answer 6

Facilitated diffusion is a process where molecules pass through the membrane via protein channels.

Question 7

True or False: Osmosis is the diffusion of water across a selectively permeable membrane.

Answer 7

True

Question 8

Fill in the blank: Active transport moves substances against their _____ gradient.

Answer 8

concentration

Question 9

Multiple choice: Which of the following does NOT require energy?
A) Active transport
B) Osmosis
C) Endocytosis
D) Exocytosis

Answer 9

B) Osmosis

Question 10

What is the difference between primary and secondary active transport?

Answer 10

Primary active transport directly uses ATP for energy, while secondary active transport uses the energy from the movement of another substance.

Question 11

True or False: Concentration gradients are only found in biological systems.

Answer 11

False

Question 12

What is the effect of a steep concentration gradient on diffusion rate?

Answer 12

A steep concentration gradient increases the rate of diffusion.

Question 13

Fill in the blank: In a hypertonic solution, the concentration of solute is _____ outside the cell compared to inside.

Answer 13

higher

Question 14

Multiple choice: Which transport mechanism involves the engulfing of particles by the cell membrane?
A) Diffusion
B) Active transport
C) Endocytosis
D) Osmosis

Answer 14

C) Endocytosis

Question 15

What happens to a cell placed in a hypotonic solution?

Answer 15

The cell will swell and may burst due to water influx.

Question 16

True or False: All transport mechanisms are equally effective in moving substances across membranes.

Answer 16

False

Question 17

What is the term for the transport of large particles out of the cell?

Answer 17

Exocytosis

Question 18

Fill in the blank: The movement of ions through ion channels is an example of _____ transport.

Answer 18

facilitated

Question 19

Multiple choice: Which of the following is a characteristic of active transport?
A) It moves substances down their concentration gradient.
B) It can involve carrier proteins.
C) It does not require ATP.
D) It occurs spontaneously.

Answer 19

B) It can involve carrier proteins.

Question 20

What role do carrier proteins play in facilitated diffusion?

Answer 20

Carrier proteins help transport specific molecules across the cell membrane.

Question 21

True or False: Concentration gradients can be maintained without energy input.

Answer 21

False

Question 22

What is the term for the process of water moving out of a cell?

Answer 22

Crenation

Question 23

Fill in the blank: The process of moving substances in and out of cells is known as _____ transport.

Answer 23

cellular

Question 24

Multiple choice: Which statement about osmosis is true?
A) It requires energy.
B) It involves the movement of solutes.
C) It is the movement of water.
D) It occurs only in plant cells.

Answer 24

C) It is the movement of water.