M9 - Membrane Transport: Passive Transport

Question 1

The most direct forms of membrane transport are considered?

Answer 1

Passive

Question 2

It is a naturally-occurring phenomenon and does not require the cell to exert any of its energy to accomplish the movement

Answer 2

Passive transport

Question 3

All forms of passive transport involve this process

Answer 3

Diffusion

Question 4

Occurs when substances simply move from an area of higher concentration to an area of lower concentration

Answer 4

Diffusion

Question 5

The difference in concentration of a substance across a space

Answer 5

Concentration gradient

Question 6

The molecules move or diffuse from an area where it is more concentrated to an area where it’s less concentrated. This is said to be “moving” down or “following” the concentration gradient. As the solute moves, the gradiennt disappears but the substances are still moving.

Answer 6

Dynamic equilibrium

Question 7

Factors that affect the rate of diffusion

Answer 7

Concentration gradient, temperature, mass of particles, solvent properties

Question 8

The greater the difference in concentration, the faster the molecules will go down the concentration gradient, hence more rapid diffusion

Answer 8

Concentration gradient

Question 9

The closer the distribution of the material gets to equilibrium, the slower the molecules will move and rate of diffusion decreases.

Answer 9

Concentration gradient

Question 10

Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion. Lower temperatures decrease the energy of the molecules, thus decreasing the rate of diffusion.

Answer 10

Temperature

Question 11

Heavier molecules move more slowly; therefore, they diffuse more slowly. The reverse is true for lighter molecules.

Answer 11

Mass of particles

Question 12

Diffusion is significantly influenced by viscosity and density. The denser or viscous the medium is, the harder it is for the given particle to diffuse through it. Therefore, the diffusion rate would be lower.

Answer 12

Solvent properties

Question 13

If the medium is less dense or less viscous, then the particles will be able to move more quickly and will diffuse faster

Answer 13

Solvent properties

Question 14

Three types of passive transport

Answer 14

Simple diffusion, facilitated diffusion, and osmosis

Question 15

A form of passive transport in which substance moves down its concentration gradient without the use of transport proteins

Answer 15

Simple diffusion

Question 16

Cells can utilize this process to acquire vital substances or get rid of toxic wastes if the gradients spread wihout energy input

Answer 16

Simple diffusion

Question 17

Occurs when materials diffuse across the plasma membrane with the help of membrane proteins

Answer 17

Facilitated diffusion

Question 18

Has a concentration gradient exists that would allow these materials to diffuse into the cell without consuming cellular energy

Answer 18

Facilitated diffusion