Membranes Chpt. 5

Question 1

What is facilitated diffusion

Answer 1

Channel proteins
Carrier proteins
Moving through an gradient

Question 2

Explain channel proteins

Answer 2

(Ion channels) allow passage of ions 
Gated channels (open and close in response to stimulus) 
Direction varies

Question 3

What 3 ways determine direction of channel proteins

Answer 3

Relative concentration on either side of membrane
Voltage difference
Gated channel

Question 4

Explain carrier proteins

Answer 4

Helps transport ions & other solutes
Requires concentration difference across membrane
Must bind to molecule

Question 5

Explain osmosis

Answer 5

Net diffusion of water across a membrane toward a higher solute

Question 6

Define hypertonic

Answer 6

Solution has a higher solute concentration

Question 7

Define hypotonic

Answer 7

Solution has a lower solute concentration

Question 8

Define isotonic

Answer 8

When two solutions have the same osmotic concentration

Question 9

Define active transport

Answer 9

Requires energy (atp)
Moves substances from low to high concentration
Selective carrier proteins

Question 10

Carrier proteins in active transport

Answer 10

Uniporters (move one molecule)
Symporters (move two molecules)
Antiporters (move two molecules in opposite direction)

Question 11

Explain bulk transport

Answer 11

Endocytosis

Exocytosis