LSU Bio 1201 exam 2
Study online at https://quizlet.com/_vqxzt
1. why are membranes called phospholipid bilayers? phospholipids have hy-
drophilic head and hy-
drophobic tail, hydropho-
bic face inside of cell mak-
ing 2 layers
2. what is meant by fluid mosaic? Mosaic of proteins drifting
laterally in fluid bilayer of
phospholipids
3. how are membranes adjusted for different tempera- membrane fluidity adjust-
tures? ed by changing the ratio
of unsaturated to saturat-
ed fatty acids
4. how do the relative amounts of saturated and unsat- if you are in a cold en-
urated fats change? vironment you want more
saturated fats for your
membranes to be flu-
id; warm environment you
want more saturated fats
to make your membranes
more solid
5. what is meant by membrane fluidity? not too solid, not too fluid
6. why is fluidity an important property? preserves membrane
function
7. Henrique and Hanson performed experiments with found that membrane flu-
pigs and examined the effects on the relative amounts idity can acclimate to
of saturated and unsaturated fats. What did they find? temperature; pigs raised
wearing underwear in a
, LSU Bio 1201 exam 2
Study online at https://quizlet.com/_vqxzt
hot room had subcuta-
neous fats with higher
melting point
8. what types of molecules can move easily across the small nonpolar molecules,
membrane? gases, steroid hormones,
and water
9. what is simple diffusion? down the concentration
gradient; does not require
supplied energy; does not
use a carrier molecule
10. what is facilitated diffusion? down the concentration
gradient; employs carri-
er molecule; does not re-
quire supplied energy
11. what is active transport? work must me done; must
use supplied energy; em-
ploys carrier molecule
12. for which transport processes are carrier molecules facilitated diffusion and
involved? active transport
13. which transport processes require the input of addi- active transport
tional energy?
14. what is a semi-permeable barrier? only some types of mole-
cules pass through
15. when equilibrium is reached in diffusion: does move- no
ment of molecules stop?
Study online at https://quizlet.com/_vqxzt
1. why are membranes called phospholipid bilayers? phospholipids have hy-
drophilic head and hy-
drophobic tail, hydropho-
bic face inside of cell mak-
ing 2 layers
2. what is meant by fluid mosaic? Mosaic of proteins drifting
laterally in fluid bilayer of
phospholipids
3. how are membranes adjusted for different tempera- membrane fluidity adjust-
tures? ed by changing the ratio
of unsaturated to saturat-
ed fatty acids
4. how do the relative amounts of saturated and unsat- if you are in a cold en-
urated fats change? vironment you want more
saturated fats for your
membranes to be flu-
id; warm environment you
want more saturated fats
to make your membranes
more solid
5. what is meant by membrane fluidity? not too solid, not too fluid
6. why is fluidity an important property? preserves membrane
function
7. Henrique and Hanson performed experiments with found that membrane flu-
pigs and examined the effects on the relative amounts idity can acclimate to
of saturated and unsaturated fats. What did they find? temperature; pigs raised
wearing underwear in a
, LSU Bio 1201 exam 2
Study online at https://quizlet.com/_vqxzt
hot room had subcuta-
neous fats with higher
melting point
8. what types of molecules can move easily across the small nonpolar molecules,
membrane? gases, steroid hormones,
and water
9. what is simple diffusion? down the concentration
gradient; does not require
supplied energy; does not
use a carrier molecule
10. what is facilitated diffusion? down the concentration
gradient; employs carri-
er molecule; does not re-
quire supplied energy
11. what is active transport? work must me done; must
use supplied energy; em-
ploys carrier molecule
12. for which transport processes are carrier molecules facilitated diffusion and
involved? active transport
13. which transport processes require the input of addi- active transport
tional energy?
14. what is a semi-permeable barrier? only some types of mole-
cules pass through
15. when equilibrium is reached in diffusion: does move- no
ment of molecules stop?
