Flashcards in Chapter 5 -1 Deck (18)
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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
