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Flashcards in Chapter 5 -1 Deck (18):
1

What are the different types of transport?

Diffusion
Passive transport
Active transport
Bulk flow

2

Passive transport ______ energy
Active transport ______ energy

not require
require

3

What is diffusion?

the movement of molecules across the selectively permeable lipid bilayer

4

What does diffusion occur with?

small and nonpolar molecules

5

What is diffusion affected by?

size, temp, concentration steepness

6

What is Osmosis?

the diffusion of water across a membrane
(water moves down its concentration gradient)

7

What is osmosis based of?

Tonicity, which is the relative solute concentration of 2 fluids

8

Hypotoinc if...?
Hypertonic if...?
Isotonic if...?

fewer solutes
more solutes
same amount

9

Cell survival depends on?

controlling water balance

10

What is passive transport?

facilitated diffusion -diffusion via transport proteins

11

What are the different types of passive transport?

channel proteins or gates

12

What do channel proteins/gates do?

allow large /polar molecules and ions
and can be affected by charge - electrical gradient

13

What happens in active transport?

a solute is moved against its concentrations gradient

14

What does active transport require?

Energy, ATP and protein pumps

15

What does ATP activate?

transporter protein/pump

16

What does the binding of a phosphate group do?

changes protein shape and affinity for solute in some pumps

17

What is an example of ATP?

Sodium- Potassium pump

18

What does the membrane pump set up?

the membrane potential