LSU Bio 1201 Exam 2 2026 Exam
Questions with 100% Correct
Answers | Latest Update
why are membranes called phospholipid bilayers? - 🧠 ANSWER
✔✔phospholipids have hydrophilic head and hydrophobic tail, hydrophobic
face inside of cell making 2 layers
what is meant by fluid mosaic? - 🧠 ANSWER ✔✔Mosaic of proteins drifting
laterally in fluid bilayer of phospholipids
,how are membranes adjusted for different temperatures? - 🧠 ANSWER
✔✔membrane fluidity adjusted by changing the ratio of unsaturated to
saturated fatty acids
how do the relative amounts of saturated and unsaturated fats change? - 🧠
ANSWER ✔✔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? - 🧠 ANSWER ✔✔not too solid, not too
fluid
why is fluidity an important property? - 🧠 ANSWER ✔✔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? - 🧠 ANSWER ✔✔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? - 🧠
ANSWER ✔✔small nonpolar molecules, gases, steroid hormones, and
water
what is simple diffusion? - 🧠 ANSWER ✔✔down the concentration gradient;
does not require supplied energy; does not use a carrier molecule
what is facilitated diffusion? - 🧠 ANSWER ✔✔down the concentration
gradient; employs carrier molecule; does not require supplied energy
what is active transport? - 🧠 ANSWER ✔✔work must me done; must use
supplied energy; employs carrier molecule
for which transport processes are carrier molecules involved? - 🧠 ANSWER
✔✔facilitated diffusion and active transport
which transport processes require the input of additional energy? - 🧠
ANSWER ✔✔active transport
what is a semi-permeable barrier? - 🧠 ANSWER ✔✔only some types of
molecules pass through
when equilibrium is reached in diffusion: does movement of molecules
stop? - 🧠 ANSWER ✔✔no
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
Questions with 100% Correct
Answers | Latest Update
why are membranes called phospholipid bilayers? - 🧠 ANSWER
✔✔phospholipids have hydrophilic head and hydrophobic tail, hydrophobic
face inside of cell making 2 layers
what is meant by fluid mosaic? - 🧠 ANSWER ✔✔Mosaic of proteins drifting
laterally in fluid bilayer of phospholipids
,how are membranes adjusted for different temperatures? - 🧠 ANSWER
✔✔membrane fluidity adjusted by changing the ratio of unsaturated to
saturated fatty acids
how do the relative amounts of saturated and unsaturated fats change? - 🧠
ANSWER ✔✔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? - 🧠 ANSWER ✔✔not too solid, not too
fluid
why is fluidity an important property? - 🧠 ANSWER ✔✔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? - 🧠 ANSWER ✔✔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? - 🧠
ANSWER ✔✔small nonpolar molecules, gases, steroid hormones, and
water
what is simple diffusion? - 🧠 ANSWER ✔✔down the concentration gradient;
does not require supplied energy; does not use a carrier molecule
what is facilitated diffusion? - 🧠 ANSWER ✔✔down the concentration
gradient; employs carrier molecule; does not require supplied energy
what is active transport? - 🧠 ANSWER ✔✔work must me done; must use
supplied energy; employs carrier molecule
for which transport processes are carrier molecules involved? - 🧠 ANSWER
✔✔facilitated diffusion and active transport
which transport processes require the input of additional energy? - 🧠
ANSWER ✔✔active transport
what is a semi-permeable barrier? - 🧠 ANSWER ✔✔only some types of
molecules pass through
when equilibrium is reached in diffusion: does movement of molecules
stop? - 🧠 ANSWER ✔✔no
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
