Diffusion

Question 1

Define diffusion

Answer 1

the movement of particles from an area of high concentration to an area of low concentration down a concentration gradient

Question 2

Define Brownian motion

Answer 2

Particles are always in motion duw to Brownian motion

Question 3

What is the cause of Brownian motion?

Answer 3

Particles are always in motion, and due to the constant collisions this causes eventually they will all be evenly distributed

Question 4

Does diffusion recquire energy?

Answer 4

No, it is a passive process

Question 5

When will diffusion always occur?

Answer 5

When there is a difference in concentration

Question 6

Why does diffusion occur?

Answer 6

to reach an equilibrium

Question 7

What is facilitated diffusion?

Answer 7

diffusion with the use of carrier proteins to take particles through the cell membrane

Question 8

Does facilitated diffusion require energy?

Answer 8

No, it is a passive process

Question 9

What is osmosis?

Answer 9

the diffusion of water molecules from an area of high concentration to an area of low concentration

Question 10

what is a solution?

Answer 10

the result of a substance being dissolved in water

Question 11

a weak solution has a _____ concentration of water

Answer 11

high

Question 12

a strong solution has a _____ concentration of water

Answer 12

low

Question 13

What is a solute?

Answer 13

the substance that is dissolved

eg- sugar

Question 14

What is a solvent?

Answer 14

the substance that does the dissolving

eg- water

Question 15

When will osmosis occur?

Answer 15

in cells placed in either weak or strong solutions

Question 16

water will move from an area of ____ solute concentration to an area of ____ solute concentration

Answer 16

low, high

Question 17

What is a hypotonic solution?

Answer 17

a solution with a lower concentration of solutes outside the cell than inside

Question 18

What is a hypertonic solution?

Answer 18

a solution with a higher concentration of solutes inside the cell than outside

Question 19

What is an Isotonic solution?

Answer 19

A solution with an equal concentration of solutes inside and outside of the cell

Question 20

What is active transport?

Answer 20

the movement of particles form an area of low concentration to an area of high concentration (against the concentration gradient)

Question 21

Why does active transport occur?

Answer 21

to obtain extra important materials for the cell

Question 22

Does active transport require energy?

Answer 22

Yes, it needs ATP

Question 23

What is bulk transport?

Answer 23

the movement of macromolecules into or outside of the cell

Question 24

What is endocytosis?

Answer 24

the incorporation of substances from outside the cell into the cell, in a membrane-bound vacuole

Question 25

what is phagocytosis?

Answer 25

the engulfment of solid particles

Question 26

what is pinocytosis?

Answer 26

the engulfment of liquid particles

Question 27

what is receptor mediated endocytosis?

Answer 27

engulfment of specific particles according to membrane receptors

Question 28

what is exocytosis?

Answer 28

releasing substances from inside the cell to the outside of the cell