Mod 1 Quiz 4: Cell Membrane Structure and Function

Question 1

What are the 4 main components of the cell membrane

Answer 1

• phospholipids
• proteins
• carbohydrate chains
• cholesterol

Question 2

Channel Proteins

Answer 2

Provide space for certain substances to move across the membrane (passive transport)

Question 3

Carrier Proteins

Answer 3

actually help certain substances move across the membrane (active or passive transport)

Question 4

Concentration

Answer 4

How much solute and solvent are in a solution

Question 5

Concentration Gradient

Answer 5

two adjacent solutions with different concentrations; may or may not have a membrane between them

Question 6

Permeable

Answer 6

describes membrane that usually lets things pass through

Question 7

Impermeable

Answer 7

describes membrane that doesn’t let certain things pass through

Question 8

Semipermeable

Answer 8

describes a membrane that lets some things pass through and not other things. Usually used for non-living membranes

Question 9

Selectively Permeable

Answer 9

describes a membrane that lets some things pass and not other things but it’s not always the same what can and can’t pass through

Question 10

Diffusion

Answer 10

Substance moves from a higher concentration to a lower concentration. (with the concentration gradient) (passive transport)

Question 11

Facilitated Diffusion

Answer 11

diffusion that involves channel or carrier proteins. (passive transport) (must involve a cell membrane)

Question 12

Osmosis

Answer 12

Movement of water through a membrane from a higher concentration to a lower concentration.

Question 13

Aquaporins

Answer 13

Special channel proteins that allow water to enter the cell membrane

Question 14

Water Potential

Answer 14

The tendency of water to move from one area to another

Question 15

Solute Pressure

Answer 15

The tendency of water to move in or out of the cell depending on the solute amount in each area. More solute = higher solute pressure

Question 16

Pressure Potential

Answer 16

tendency of water to move into or out of the cell depending on how much water is in each area

Question 17

Hypertonic Solution

Answer 17

There is more solute in the solution

Question 18

Hypotonic

Answer 18

There is less solute in the solution

Question 19

Isotonic

Answer 19

There is an equal amount of solute in both solutions

Question 20

Tonicity

Answer 20

the solutions solute concentration

Question 21

Plasmolysis

Answer 21

a cell will shrivel if water if too much water goes out

Question 22

Cytolysis

Answer 22

a cell can burst if too much water is in it

Question 23

Pumps

Answer 23

proteins that use energy to carry substances through membranes from a lower concentration and a higher concentration

Question 24

Bulk Transport

Answer 24

Uses vesicles to transport large things

Question 25

Exocytosis

Answer 25

A vesicle surrounds a substance, attaches onto a cell membrane and expels waste outside of the cell

Question 26

Endocytosis

Answer 26

The cell membrane wraps around a substance and then breaks of to form a vesicle and bring the substance anywhere

Question 27

Phagocytosis

Answer 27

vesicle used to bring in a large solid particle

Question 28

pinocytosis

Answer 28

vesicles used to bring in smaller particles in extracellular fluid

Question 29

Receptor Mediated Endocytosis

Answer 29

vesicle only forms to bring something in if receptors are activated