Biology Questions and Answers
Cell Membrane
- What is a membrane?
Membrane is any delicate sheet that
separates onblocking or permitting (se region from anotherelectively or (^)
completely) the passage of substances.
The skin, foconsidered a membrane that ser example, can be (^) parates
the exterior fbody; cellophane, used in chemicalrom the interior of the
laboratories to separate solutions, acts
as a membrane too.
- Concerning their
permeability how are
membranes classified?
Membranes can be classified as
impermeable, semipermeable or selectivelypermeable, (^)
permeable.
An impermeable membrane is thatthrough which no substance can pass. (^)
Semipermthat let only solveeable membrannts, like water, toes are those
pass through it. Permare those that let solveeable membrannt and solutes,es
like ions and molecules, to pass across
it. There are also selectively pmembranes, i.e., membranes thatermeable
besides allowing the passage of solvent,
let only somwhile blocking ote specific solutes to passhers.
- What is diffusion?
Diffusion is the spreading of substance
molecules fsubstance isrom a r more conceegion where thentrated to
another region where it is less
concentrated. boiling of water in For example, a kitchen during thegaseous
water particlesin the air by diffusion. tend to uniformly spread - What is meant by
concentration gradient? Is it
correct to refer to
“concentration gradient of
water”?
Concentration gradient is the difference
of concentration otwo regions. f a substance between
Concentrationdesignate the quantity of a solute is a term used to (^)
divided by the total quantity of the
solutiosolvent in this situation it is not n. Since water in general is thecorrect (^)
to refer to “concentration of water” in a
given solution.
- What is the difference
between osmosis and
diffusion?
Osmosis is the movement of solvent pphenomenon ofarticles (in (^)
general, water) from a region of lower
solute concehigher solute concentration to a rntration. Difegion offusion, (^)
on the other hand, is the movement of
solutes from a region of higher solute
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