Diffusion and Osmosis Homework Assignment

Diffusion and Osmosis Homework Assignment
Diffusion and Osmosis Homework Assignment
1. Consider two aqueous solutions of different concentration separated by a semipermeable membrane. In this situation, osmosis results in:
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A. Water molecules moving to the side where the solution concentration is
lower
B. The more concentrated solution becoming even more concentrated
C. The more dilute solution becoming even more dilute
D. The more concentrated solution becoming more dilute
Answer is D: The result of osmosis is that the more concentrated solution becomes
more dilute.
Diffusion and Osmosis Homework Assignment
2. Osmosis may be defined as which of the following?
A. The diffusion of water molecules across a semipermeable membrane from
the solution with lower water concentration into the solution of higher water
concentration
B. The movement of water molecules across a semipermeable membrane from
the solution of higher concentration into the solution of lower concentration
C. The diffusion of solute particles across a semipermeable membrane from the
solution of higher concentration into the solution of lower concentration
D. The movement of water molecules across a semipermeable membrane from
the solution of lower concentration into the solution of higher concentration
Answer is D: The definition should include “water”, movement through an SP
membrane and direction of water flow from more dilute solution into the solution of
higher concentration.
3. What is the movement of water molecules across a plasma membrane from the
side where the solution concentration is more dilute to the side where the solution is more concentrated called?
A. Osmosis
B. Reverse osmosis
C. Diffusion
D. Hydration
Answer is A: Osmosis is the diffusion of WATER molecules through a membrane,
from where there is a higher concentration of water molecules to where there is a
lower concentration of water molecules (i.e. into the more concentrated solution).
Diffusion and Osmosis Homework Assignment
4. The movement of water molecules through a plasma membrane from the side
where there is a higher concentration of water molecules to the side where there
are fewer is best known as:
A. Diffusion
B. Osmosis
C. Pinocytosis
D. Hydrolysis
Answer is B: Osmosis is the diffusion of water molecules through a membrane,
down to their concentration gradient.
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78
5. The diffusion of water molecules across a cell membrane from the side where the
solution concentration is more dilute to the side where it is greater is known as
which of the following?
A. Osmosis
B. Filtration
C. Hydrolysis
D. Buffer action
Answer is A: This is a definition of osmosis.
6. If a semipermeable membrane separates two aqueous solutions with different
osmotic pressures, what will be the direction of water flow between solutions?
From:
A. Higher osmotic pressure to the solution of lower osmotic pressure
B. Lower osmotic pressure to the solution of higher osmotic pressure
C. Higher concentration to the solution of lower concentration
D. Higher hydrostatic pressure to the solution of lower hydrostatic pressure
Answer is B: Lower osmotic pressure means a lower solution concentration (and a
higher concentration of water molecules). Water moves from the dilute solution into
the more concentrated one.
7. During dialysis, what moves across a semipermeable membrane (and how)?
A. Water molecules by diffusion from the region of high solute concentration to
the region of low solute concentration
B. Water molecules by filtration from the region of high hydrostatic pressure to
the region of low hydrostatic pressure
C. Solutes by diffusion from the region of high solute concentration to the
region of low solute concentration
D. Solutes by filtration from the region of low hydrostatic pressure to the region
of high hydrostatic pressure
Answer is C: Dialysis refers to movement of solutes (not water). Choice D is wrong
as filtration refers to movement due to hydrostatic pressure difference from the solution under higher pressure to low pressure.
8. A suitable definition of osmosis would be movement:
A. Of solute particles through a plasma membrane from the side where their
concentration is greatest to the side where it is lower
B. Of water molecules through a plasma membrane from the side where their
concentration is greatest to the side where it is lower
C. Of a substance from a region where it is in high concentration to where its
concentration is lower
D. Caused by a hydrostatic pressure difference
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