Harper Diffusion Question Preview (ID: 34416)
Diffusion.
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During diffusion of a substance
a) the substance moves from low to high concentration
b) the substance moves from high to low concentration
c) the substance doesn't move
d) all substances remain in equilibrium
Osmosis is the diffusion of
a) water
b) salt
c) sugar
d) cytoplasm
The cells membrane is responsible for what enters and leaves the cell .
a) true
b) false
c)
d)
The only substance that we (as 7th graders) can only assume would be permeable to a cell membrane (without being told in the question) is water.
a) true
b) false
c)
d)
A student put a stalk of wilted celery into a glass of water. After one hour, the celery was no longer wilted. Why?
a) salt diffused out of the cells of the celery stalk
b) salt diffused into the cells of the celery stalk,.
c) water diffused out of the cells of the celery stalk
d) water diffused into the cells of the celery stalk
Particles move from areas of higher concentration to areas of lower concentration during
a) osmosis
b) cellular respiration
c) simple diffusion
d) cell division
After a living cell is placed in pure water, the cell will
a) enlarge when water diffuses across the membrane into the cytoplasm
b) shrink when large molecules are transported into the cytoplasm
c) enlarge when water from inside the cell is carried out across the membrane
d) shrink when sugars diffuse out of the cell across the membrane
Most single-celled aquatic organisms use oxygen that is dissolved in water. When the oxygen concentration of the water is greater than the oxygen concentraion of the organism, oxygen passes through the cell membrane to the organism. What process ?
a) respiration
b) photosynthesis
c) mitosis
d) diffusion
A cell is placed in a highly concentrated salt solution. What will happen to the cell?
a) salt will move out of the cell
b) salt will move into the cell
c) water will move out of the cell
d) water will move into the cell
Students place an egg without its shell in a concentrated sugar solution and leave it over night. Which of the following is most likely true the next day?
a) the egg shrank because water moved out of the egg
b) the egg enlarged because water moved into the egg
c) the egg enlarged because sugar entered the cell
d) the egg shrank because sugar left the cell
This may happen to animal cells when placed in pure water.
a) shrink and dry up
b) swell and burst
c) no change
d) it could be any of these
The only substance that does osmosis is ___.
a) cytoplasm
b) sugar
c) salt
d) water
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