Unit 1 test part 4

Question 1

what is phospholipid bilayer made of

Answer 1

phosphodiglycerides

Question 2

Nature of fatty acid tails make it impermeable to

Answer 2

1)polar molecules except some water
2)Charged ions (minerals)
3)Large molecules

Question 3

Movement of molecules across the plasma membrane depends on…

Answer 3

A) nature of the bilayer
i) saturated tight more packly and have stronger solid barrier while UFA bend making them have weaker barrier
ii)length of the fatty acid=Some Fa have shorter tails which weakens the barrier (ALSO, cholesterol adds more fluidity)

B) nature of the molecule
1ionic very slow
2.polar slow
3.Non polar very fast
ii) size

Question 4

what are O2, N2,CO2

Answer 4

non polar and small

Question 5

What are na+, Cl-, H+

Answer 5

small ions

Question 6

What are h2o and Nh3

Answer 6

polar and small

Question 7

List 6 funcctions of inegral transmembrane protein

Answer 7

1) transport channel
2)cell identity markers
3)Enzyme
4)Cell adhesion
5)Receptor sites
6)Attachment to cytoskelton

Question 8

Passive transport and examples

Answer 8

with gradients
high to low
requiers no cell energy
eg
1) simple diffusion small nonpolar go directly throw the membrane while water and soluble go through the protein channel.
2) facilitated diffusion for large aa molecules and polar molecules (glucose)

Question 9

Active transport aka carrier-mediated transport

Answer 9

-against gradient
-low to high
-cell energy atp needed