AnswersCO-Biology B-CRUnit Test

Unit Test — Cumulative exam Answers

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1
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How is a brain injury classified?

A
as an injury of the peripheral nervous system
B
as an injury of the central nervous system
C
as an injury of the autonomic nervous system
D
as an injury of the somatic nervous system
2
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In rock layers, jellyfish fossils are found lower than trilobite fossils, and trilobite fossils are found lower than ammonite fossils. What can be determined from this information?

A
Trilobites existed before jellyfish and ammonites.
B
Jellyfish existed before trilobites and ammonites.
C
Ammonites existed before trilobites and jellyfish.
D
Jellyfish, trilobites, and ammonites lived together.
3

How do limiting factors most affect population size?

A
stop population growth
B
restrict population growth
C
increase population growth
D
decrease population growth
4

When is the most likely time for a female to become pregnant during her menstrual cycle?

A
on the first day of her period
B
on the last day of her period
C
about a week after her period ends
D
about a week before her period begins
5

A muskrat population is growing exponentially. What might cause this population to enter logistic growth?

A
resources become scarce
B
birth rate increases
C
emigration decreases
D
carrying capacity is increased
6

Which person’s function in a school is similar to the central nervous system’s role in a human body?

A
a cafeteria worker
B
a student
C
a principal
D
a bus driver
7

When calcium levels in the blood are too low, the body releases a hormone that removes calcium from the bones. A person who suffers from a certain type of thyroid disease will often have low blood calcium and brittle bones because the body is taking the calcium from the bones. The afflicted person will typically see an endocrinologist, who studies hormones, and an orthopedist, who studies bones. What do these two doctors have in common?

A
They both focus on hormone levels.
B
They both focus on bone density.
C
They both focus on calcium levels.
D
They both focus on the thyroid.
8

What hypothesis did Darwin investigate by studying the breeding of pigeons with distinctive traits?

A
New species can appear gradually through small changes in an ancestral species.
B
The amount of variation in a population is related to the type of environment it lives in.
C
Organisms have only the number of offspring that are supported by the environment.
D
Some traits appear in each generation, while others seem to disappear in some generations.
9

What could explain the curve in this population growth graph?

Question illustration
A
an unlimited food supply
B
a natural disaster
C
a population crash
D
a reduction in predators
10

Which best describes the relationship between two species and a niche?

A
If two species have the same niche, one species will always become extinct.
B
Two species are able to occupy the same niche in the same habitat.
C
Two species cannot occupy the same niche in the same habitat.
D
If two species have the same niche, one species will always move.
11

Which best explains why angiosperms are the most diverse and successful plant group today?

A
Reproduction is aided by flowers, protected seeds, and insect pollinators.
B
Water transport and photosynthesis are aided by vascular tissue.
C
Plant growth and increasing size are aided by a new way to distribute nutrients.
D
Reproduction is aided by exposed seeds and wind pollination.
12

A commercial on television advertises a new medicine that claims to boost immunity. You want to verify that the claim is scientifically based. Which source is least likely to provide you with accurate information about this new medicine?

A
a magazine about entertainment and lifestyle trends
B
the studies that the television ad cites
C
a brochure from the doctor’s office
D
the website of the governmental agency that tests health products
13

If a deer eats grass, what percentage of energy will the deer acquire from the grass?

A
0.1 percent
B
1 percent
C
10 percent
D
100 percent
14

A population of zebras experienced ten births, six deaths to predation, three deaths to disease, three individuals joining the population, and zero individuals leaving. What is happening to the population growth?

A
It is increasing.
B
It is decreasing.
C
It is staying the same.
D
It reaches carrying capacity.
15

Which best describes the different modes of bacterial reproduction?

A
In genetic recombination, two new genetically identical cells are produced.
B
In conjugation, a special sex pilus is required to connect two bacterial cells.
C
In transduction, a bacterium exchanges a piece of its own DNA with another from the environment.
D
In transformation, bacterial DNA is transferred from one bacterium to another by a replicating virus.
16

A conservation biologist has determined the status of the ecosystems in a protected area, as shown in the table below. Based on the table, which part of the pie chart represents secondary succession?Status of ecosystemsPercentage of protected areaPrimary succession10Secondary succession30Barren land5Established community55

Question illustration
A
segment A
B
segment B
C
segment C
D
segment D
17

The graph shows the changing levels of hormones during menstruation and ovulation. Which hormone has the most influence on preparing the body for pregnancy?

Question illustration
A
Luteinizing hormone promotes fertility because it spikes the most during ovulation.
B
Estradiol promotes fertility because it peaks slightly before ovulation.
C
Progesterone promotes fertility because its levels rise during ovulation and immediately after.
D
Follicle-stimulating hormone promotes fertility because it is released mostly during ovulation.
18

A relationship in which one organism benefits while the other is neither harmed nor helped is called

A
predation.
B
parasitism.
C
commensalism.
D
mutualism.
19

Scientists group organisms into kingdoms by looking at specific characteristics. Thermus aquaticus, shown below, is a specialized bacteria called a thermophile. Thermophiles are microorganisms that can live in bodies of water that are extremely hot, such as deep sea hydrothermal vents.Which characteristic most likely describes a mushroom but not Thermus aquaticus?

Question illustration
A
cell wall
B
eukaryotic
C
unicellular
D
prokaryotic
20

The body obtains sugar from food. Which system most directly affects blood sugar levels?

A
respiratory
B
muscular
C
circulatory
D
digestive

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