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OSMOSIS
Which of these substances moves across cell membranes by osmosis?
A.
B.
C.
D.
salt
sugar
water
protein
Correct Answer:
C
Which of these is the process by which water moves across a selectively permeable membrane?
A.
B.
C.
D.
osmosis
transpiration
capillary action
active transport
Correct Answer:
A
Starch turns blue-black in the presence of iodine solution. A selectively permeable dialysis sac containing a
starch solution is placed into a beaker of iodine solution.
If the dialysis sac is permeable only to water and iodine, what will the solutions in the beaker and the sac look
like after two hours?
A.
B.
C.
D.
The iodine solution in the beaker will turn blue-black; the starch solution will not change.
The starch solution in the dialysis sac will turn blue-black; the iodine solution will not change.
Neither solution will turn blue-black.
Both solutions will turn blue-black.
Correct Answer:
B
Starch turns blue-black in the presence of iodine solution. A selectively permeable dialysis sac containing a
starch solution is placed into a beaker of iodine solution.
Which of these processes is demonstrated by the experiment shown in the diagram?
A.
B.
C.
D.
cellular respiration
active transport
endocytosis
diffusion
Correct Answer:
D
Many bacteria live in fresh water. Which of these statements best describes what will happen when freshwater
bacterial cells are placed in salt water?
A.
B.
C.
D.
Water leaves the cell, causing the cell to expand.
Water leaves the cell, causing the cell to shrink.
Water enters the cell, causing the cell to expand.
Water enters the cell, causing the cell to shrink.
Correct Answer:
B
Read the description of the experiment and use the table of results below to answer the following question.
A student designed an experiment to see if plants grow better when watered with a sugar solution. He divided
the plants into six groups, measured the initial height of each plant, and calculated the average height for each
group. Once a week for two months, he watered the plants in each group using a different sugar solution for
each plant group. At the end of two months, he measured the final height of each plant and calculated the
average height for each group. The student’s data are shown in the table below.
Which of these statements explains why the plants in Groups E and F died?
A.
B.
C.
D.
The high sugar content caused too much water to move out of the root cells.
The high sugar content caused too much water to move into the root cells.
The high sugar content prevented the plant from capturing energy.
The high sugar content clogged the pores in the cell membranes.
Correct Answer:
A