LSU Bio 1201 exam 2 questions with answers
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why are membranes called phospholipid bilayers? - CORRECT
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ANSWERS ✔✔phospholipids have hydrophilic head and |\ |\ |\ |\ |\ |\
hydrophobic tail, hydrophobic face inside of cell making 2 layers |\ |\ |\ |\ |\ |\ |\ |\ |\
what is meant by fluid mosaic? - CORRECT ANSWERS ✔✔Mosaic
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
of proteins drifting laterally in fluid bilayer of phospholipids
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how are membranes adjusted for different temperatures? -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔membrane fluidity adjusted by changing
|\ |\ |\ |\ |\ |\ |\
the ratio of unsaturated to saturated fatty acids
|\ |\ |\ |\ |\ |\ |\
how do the relative amounts of saturated and unsaturated fats
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
change? - CORRECT ANSWERS ✔✔if you are in a cold
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
environment you want more saturated fats for your membranes |\ |\ |\ |\ |\ |\ |\ |\ |\
to be fluid; warm environment you want more saturated fats to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
make your membranes more solid
|\ |\ |\ |\
what is meant by membrane fluidity? - CORRECT ANSWERS
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✔✔not too solid, not too fluid
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why is fluidity an important property? - CORRECT ANSWERS
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✔✔preserves membrane function |\ |\
Henrique and Hanson performed experiments with pigs and
|\ |\ |\ |\ |\ |\ |\ |\
examined the effects on the relative amounts of saturated and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
,unsaturated fats. What did they find? - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔found that membrane fluidity can acclimate to temperature;
|\ |\ |\ |\ |\ |\ |\ |\
pigs raised wearing underwear in a hot room had subcutaneous
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
fats with higher melting point
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what types of molecules can move easily across the membrane?
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- CORRECT ANSWERS ✔✔small nonpolar molecules, gases,
|\ |\ |\ |\ |\ |\ |\ |\
steroid hormones, and water |\ |\ |\
what is simple diffusion? - CORRECT ANSWERS ✔✔down the
|\ |\ |\ |\ |\ |\ |\ |\ |\
concentration gradient; does not require supplied energy; does |\ |\ |\ |\ |\ |\ |\ |\
not use a carrier molecule
|\ |\ |\ |\
what is facilitated diffusion? - CORRECT ANSWERS ✔✔down the
|\ |\ |\ |\ |\ |\ |\ |\ |\
concentration gradient; employs carrier molecule; does not |\ |\ |\ |\ |\ |\ |\
require supplied energy |\ |\
what is active transport? - CORRECT ANSWERS ✔✔work must me
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
done; must use supplied energy; employs carrier molecule
|\ |\ |\ |\ |\ |\ |\
for which transport processes are carrier molecules involved? -
|\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔facilitated diffusion and active transport
|\ |\ |\ |\ |\ |\
which transport processes require the input of additional energy?
|\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔active transport
|\ |\ |\ |\ |\
what is a semi-permeable barrier? - CORRECT ANSWERS ✔✔only
|\ |\ |\ |\ |\ |\ |\ |\ |\
some types of molecules pass through
|\ |\ |\ |\ |\
, when equilibrium is reached in diffusion: does movement of
|\ |\ |\ |\ |\ |\ |\ |\ |\
molecules stop? - CORRECT ANSWERS ✔✔no |\ |\ |\ |\ |\
when equilibrium is reached in diffusion: does the net movement
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
of molecules stop? - CORRECT ANSWERS ✔✔yes
|\ |\ |\ |\ |\ |\
what is meant by hypertonic? - CORRECT ANSWERS ✔✔lower
|\ |\ |\ |\ |\ |\ |\ |\ |\
water potential; more solutes dissolved; tend to gain water via
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
osmosis
what is meant by hypertonic? - CORRECT ANSWERS ✔✔higher
|\ |\ |\ |\ |\ |\ |\ |\ |\
water potential; fewer solutes dissolved; will tend to lose water
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
via osmosis
|\
isotonic - CORRECT ANSWERS ✔✔equivalent water potential;
|\ |\ |\ |\ |\ |\ |\
equal number of solutes; no note movement of water
|\ |\ |\ |\ |\ |\ |\ |\
in which direction does water flow? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔osmosis and the direction of net water movement|\ |\ |\ |\ |\ |\ |\
what are aquaporins? - CORRECT ANSWERS ✔✔channel proteins
|\ |\ |\ |\ |\ |\ |\ |\
which facilitate water diffusion through the membrane
|\ |\ |\ |\ |\ |\
marine bony fish are...? - CORRECT ANSWERS ✔✔hypotonic to
|\ |\ |\ |\ |\ |\ |\ |\ |\
seawater
|\ |\ |\ |\ |\ |\ |\
why are membranes called phospholipid bilayers? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔phospholipids have hydrophilic head and |\ |\ |\ |\ |\ |\
hydrophobic tail, hydrophobic face inside of cell making 2 layers |\ |\ |\ |\ |\ |\ |\ |\ |\
what is meant by fluid mosaic? - CORRECT ANSWERS ✔✔Mosaic
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
of proteins drifting laterally in fluid bilayer of phospholipids
|\ |\ |\ |\ |\ |\ |\ |\
how are membranes adjusted for different temperatures? -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔membrane fluidity adjusted by changing
|\ |\ |\ |\ |\ |\ |\
the ratio of unsaturated to saturated fatty acids
|\ |\ |\ |\ |\ |\ |\
how do the relative amounts of saturated and unsaturated fats
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
change? - CORRECT ANSWERS ✔✔if you are in a cold
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
environment you want more saturated fats for your membranes |\ |\ |\ |\ |\ |\ |\ |\ |\
to be fluid; warm environment you want more saturated fats to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
make your membranes more solid
|\ |\ |\ |\
what is meant by membrane fluidity? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔not too solid, not too fluid
|\ |\ |\ |\ |\
why is fluidity an important property? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔preserves membrane function |\ |\
Henrique and Hanson performed experiments with pigs and
|\ |\ |\ |\ |\ |\ |\ |\
examined the effects on the relative amounts of saturated and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
,unsaturated fats. What did they find? - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔found that membrane fluidity can acclimate to temperature;
|\ |\ |\ |\ |\ |\ |\ |\
pigs raised wearing underwear in a hot room had subcutaneous
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
fats with higher melting point
|\ |\ |\ |\
what types of molecules can move easily across the membrane?
|\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔small nonpolar molecules, gases,
|\ |\ |\ |\ |\ |\ |\ |\
steroid hormones, and water |\ |\ |\
what is simple diffusion? - CORRECT ANSWERS ✔✔down the
|\ |\ |\ |\ |\ |\ |\ |\ |\
concentration gradient; does not require supplied energy; does |\ |\ |\ |\ |\ |\ |\ |\
not use a carrier molecule
|\ |\ |\ |\
what is facilitated diffusion? - CORRECT ANSWERS ✔✔down the
|\ |\ |\ |\ |\ |\ |\ |\ |\
concentration gradient; employs carrier molecule; does not |\ |\ |\ |\ |\ |\ |\
require supplied energy |\ |\
what is active transport? - CORRECT ANSWERS ✔✔work must me
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
done; must use supplied energy; employs carrier molecule
|\ |\ |\ |\ |\ |\ |\
for which transport processes are carrier molecules involved? -
|\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔facilitated diffusion and active transport
|\ |\ |\ |\ |\ |\
which transport processes require the input of additional energy?
|\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔active transport
|\ |\ |\ |\ |\
what is a semi-permeable barrier? - CORRECT ANSWERS ✔✔only
|\ |\ |\ |\ |\ |\ |\ |\ |\
some types of molecules pass through
|\ |\ |\ |\ |\
, when equilibrium is reached in diffusion: does movement of
|\ |\ |\ |\ |\ |\ |\ |\ |\
molecules stop? - CORRECT ANSWERS ✔✔no |\ |\ |\ |\ |\
when equilibrium is reached in diffusion: does the net movement
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
of molecules stop? - CORRECT ANSWERS ✔✔yes
|\ |\ |\ |\ |\ |\
what is meant by hypertonic? - CORRECT ANSWERS ✔✔lower
|\ |\ |\ |\ |\ |\ |\ |\ |\
water potential; more solutes dissolved; tend to gain water via
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
osmosis
what is meant by hypertonic? - CORRECT ANSWERS ✔✔higher
|\ |\ |\ |\ |\ |\ |\ |\ |\
water potential; fewer solutes dissolved; will tend to lose water
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
via osmosis
|\
isotonic - CORRECT ANSWERS ✔✔equivalent water potential;
|\ |\ |\ |\ |\ |\ |\
equal number of solutes; no note movement of water
|\ |\ |\ |\ |\ |\ |\ |\
in which direction does water flow? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔osmosis and the direction of net water movement|\ |\ |\ |\ |\ |\ |\
what are aquaporins? - CORRECT ANSWERS ✔✔channel proteins
|\ |\ |\ |\ |\ |\ |\ |\
which facilitate water diffusion through the membrane
|\ |\ |\ |\ |\ |\
marine bony fish are...? - CORRECT ANSWERS ✔✔hypotonic to
|\ |\ |\ |\ |\ |\ |\ |\ |\
seawater
