AnswersLPS CR - Biology - ALab: Mouse Genetics (One Trait)

Lab: Mouse Genetics (One Trait) — Cumulative exam Answers

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41
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Mitosis is important because it allows

A
new cells to replace old damaged cells.
B
new cells to repair old damaged cells.
C
old cells to self-repair when they become damaged.
D
existing cells to take over the function of damaged cells.
42
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Which is the most efficient way to avoid DNA mutations from UV radiation?

A
Avoid getting X-rays at the doctor’s office.
B
Avoid protective shields during X-rays.
C
Avoid UV radiation by wearing sunscreen.
D
Avoid UV radiation by using a tanning bed.
43

A class was performing an experiment to discover the pH values of some common household substances. The results of three groups are shown in the table below.SubstanceGroup 1 pHGroup 2 pHGroup 3 pHLemon juice2.22.22.1Vinegar2.82.88.2Baking soda8.48.58.4Milk of magnesia10.210.310.2Which statement best describes evidence that Group 3’s data are less valid than the data for the other two groups?

A
Group 3’s pH value for lemon juice is lower than the values of the other two groups.
B
Group 3’s pH value for vinegar is much higher than the values of the other two groups.
C
Group 3’s pH value for baking soda does not exactly match the values of the other two groups.
D
Group 3’s pH value for milk of magnesia is different from the value obtained by Group 2.
44

Unattached earlobes is a dominant trait, E. A parent who is homozygous for unattached earlobes is crossed with a parent who is homozygous for attached earlobes. Which describes the genotypes of their offspring?

A
100 percent Ee
B
100 percent unattached earlobes
C
100 percent ee
D
100 percent attached earlobes
45

How does the cell wall protect a plant cell?

A
The cell wall protects the cell by providing support and maintaining the cell's shape.
B
The cell wall protects the cell by storing food so the plant doesn't run out.
C
The cell wall is thin and flexible, which allows the cell to be moved without harming the organelles.
D
The cell wall is on the inside of the cell and serves to contain the contents of the cell.
46

Rick’s class plans to study the effect of eating different breakfast foods on grades in morning classes. Students in the class will be the test subjects for the investigation. Which of the following would most likely make the results of the experiment invalid?

A
Half of the students ride the bus to school, and half ride in cars.
B
Some students eat breakfast two hours before other students do.
C
Some students miss school during the investigation due to illness.
D
All students in the investigation have morning classes in the same subjects.
47

If the endoplasmic reticulum were removed from the cell, which organelle would not be able to function properly, and why?

A
mitochondria, because they rely on the ER as an energy source
B
ribosomes, because they receive proteins made by the ER
C
Golgi apparatus, because it packages proteins received from the ER
D
cytoplasm, because it relies on the ER for structural support
48

Mitosis is divided into phases.Which phase of mitosis is shown in the diagram?

Question illustration
A
anaphase
B
metaphase
C
telophase
D
prophase
49

Which are produced as a result of meiosis?

A
zygotes
B
chromosomes
C
tetrads
D
gametes
50

A scientist tracked the summer eating habits of brown bears. His results are shown in the graph below.If the brown bears’ reliance on leaves increased by 14 percent, how would the combined total of all the percentages be affected?

Question illustration
A
It would increase by 14 percent.
B
It would decrease to 86 percent.
C
It would remain at 100 percent.
D
It would change to 114 percent.

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