LSU BIO 1201 BIOLOGY FOR SCIENCE MAJORS
EXAMINATION TEST 2026 COMPLETE
QUESTIONS AND SOLUTIONS 100%
CORRECT
◉ 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
◉ when equilibrium is reached in diffusion: does the net movement of
molecules stop? Answer: yes
◉ what is meant by hypertonic? Answer: lower water potential; more
solutes dissolved; tend to gain water via osmosis
◉ what is meant by hypertonic? Answer: higher water potential; fewer
solutes dissolved; will tend to lose water via osmosis
◉ isotonic. Answer: equivalent water potential; equal number of solutes;
no note movement of water
EXAMINATION TEST 2026 COMPLETE
QUESTIONS AND SOLUTIONS 100%
CORRECT
◉ 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
◉ when equilibrium is reached in diffusion: does the net movement of
molecules stop? Answer: yes
◉ what is meant by hypertonic? Answer: lower water potential; more
solutes dissolved; tend to gain water via osmosis
◉ what is meant by hypertonic? Answer: higher water potential; fewer
solutes dissolved; will tend to lose water via osmosis
◉ isotonic. Answer: equivalent water potential; equal number of solutes;
no note movement of water
