Cell Transport, Uptake And secretion

Question 1

What do membranes have ?

Answer 1

Membrane proteins

Question 2

What do these membrane proteins do

Answer 2

Depending on the proteins only certain molecules and can pass the membrane

Question 3

By what means can molecules/ions travel across a membrane

Answer 3

If they are small
Hydrophobic
Helped by channels and transporter proteins

Question 4

What is simple diffusion

Answer 4

A form of passive transport that allows small & non polar molecules to move down their gradient

Question 5

Example of molecules that moves by passive transport

Answer 5

Oxygen

Question 6

What is Facilitated diffusion

Answer 6

this is when channels and transporter proteins are used to move a solute with a low permeability coefficients down its gradient

Question 7

Example of molecule that uses

Facilitated diffusion

Answer 7

Glucose

Question 8

What is active transport

Answer 8

This is when a solute wants to move against it gradient which will require energy ( ATP HYDROLYSIS)

Question 9

How do transport proteins work

Answer 9

1 they bind to the solute
Go through conformational change
The solute is released on other side of membrane
Conformational rearrangement

Question 10

How do channels work

Answer 10

They are multi subunit proteins that weakly interacts with the solute to form pores in the membrane where solute (mostly ions can diffuse through)

Question 11

What is a uniport

Answer 11

Allows 1 cargo

Question 12

Symport

Answer 12

Allows 2 cargos in the same direction

Question 13

Antiport

Answer 13

Allows 2 cargos in opposite directions

Question 14

What do secondary active transport use

Answer 14

Gradient ion caused by primary transport

Question 15

What is endocytosis

Answer 15

Substance that are to big to pass through channels can be bulk imported involving vesicles and and endosomes.

Engulfed material is surrounded by pinched off membrane which is called endosome