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3.1.2 Review
Test Description: This is aligned to MD 3.1.2 core learning goals.
Instructions: Answer all questions to get your test result.
1) The human stomach has an acidic environment. Which enzyme with its optimal pH below most likely functions in the stomach?
A
Enzyme C--pH 11
B
Enzyme A--pH 3
C
Enzyme D--pH 14
D
Enzyme B--pH 7
2) Meat tenderizer is made with pepsin, an enzyme. If meat coated with tenderizer is placed in a refrigerator for a short time prior to cooking, how will the enzyme pepsin be affected?
A
Pepsin will no longer behave as an enzyme.
B
Pepsin activity will slow down
C
Pepsin will be broken down.
D
Pepsin molecules will change shape.
3) Spartina grows in salt marshes and stores salt in its roots. This makes the salt concentration in its roots greater than that of the surrounding water. What most likely occurs in response to this salt concentration in the roots?
A
Water moves into the roots.
B
Salt moves into the roots.
C
Nutrients move out of the roots.
D
Water moves out of the roots.
4) Which pond has the most basic water?
A
Pond 4--pH 13
B
Pond 2--pH 6
C
Pond 1--pH 3
D
Pond 3--pH 8
5) Researchers have discovered a toxin that stops cells from releasing stored energy. Cells exposed t this toxin cannot carry out many of their normal processes. When cells are exposed to this toxin, which of these would be least affected?
A
osmosis
B
meiosis
C
active transport
D
photosynthesis
6) A cell that normally lives in a 10% saltwater solution was moved into another solution. Which of these solutions would cause the cell to increase in size at the greatest rate?
A
20% salt water
B
10% salt water
C
5% salt water
D
0% salt water
7) Which of these substances moves across cell membranes by osmosis?
A
Water
B
Sugars
C
Proteins
D
Salt
8) Enzymes will stop functioning if...
A
All of the above.
B
The temperature is out of range.
C
There is no substrate.
D
The pH is out of range.
9) On a hot summer day, diffusion will occur
A
Slower
B
Same rate
C
Faster
10) Diffusion occurs when substances move from areas of ___ concentration to areas of ___ concentration to reach equilibrium.
A
low, low
B
low, high
C
high, low
D
high, high
11) Starch turns blue-black in the presence of iodine. A selectively permeable dialysis sac containing a starch solution is placed into a beaker of iodine solution. The movement of water into the sac is called
A
osmosis
B
equilibrium
C
homeostasis
D
diffusion
12) The cell membrane will allow water, oxygen, carbon dioxide, and glucose to pass through. Because other substances are blocked from entering, the membrane is called
A
semi-permeable
B
perforated
C
permeable
D
non-conductive
13) The structure most responsible for maintaining cell homeostasis is the
A
mitochondria
B
cytosplasm
C
cell membrane
D
cell wall
14) Which of these substances moves across cell membranes by osmosis?
A
sugar
B
salt
C
protein
D
water
15) Which Pond has the most acidic water?
A
Pond 3--pH 8
B
Pond 1--pH 3
C
Pond 2--pH 6
D
Pond 4--pH 13
16) Which of these is most affected in the cells of the goldfish when the water temperature is lowered?
A
pH level
B
Enzyme activity
C
salt concentration
D
DNA base sequence
17) Starch turns blue-black in the presence of iodine. If a dialysis sac with starch solution is permeable only to water and iodine and is placed in a beaker of iodine solution, what will the solutions in the beaker and the sac look like after two hours
A
Both solutions will turn blue-black.
B
The starch solution in the dialysis sac will turn blue-black; the iodine solution will not change.
C
Neither solution will turn blue-black.
D
The iodine solution in the beaker will turn blue-black; the starch solution will not change.
18) 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 process is described?
A
diffusion
B
cellular respiration
C
active transport
D
endocytosis
19) A scientist believes that a factory has been dumping acid into a local river. To test this hypothesis, which property of water should the scientist monitor?
A
density
B
polarity
C
temperature
D
pH
20) A student conducted an experiment by boiling liver (has catalase) and added it to hydrogen peroxide (HO3) solution. Catalase breaks down HO3.She observed that little to no oxygen was released. Which statement best supports the student's observations?
A
Boiling removes oxygen from the liver.
B
Exposing catalase to high temperatures makes it inactive.
C
Boiling liver breaks down hydrogen peroxide faster.
D
Exposing catalase to high temperatures changes it into a different enzyme.
*select an answer for all questions
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