Practice Exam Answers

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A scientist is studying an infectious agent in a lab. Which observation best illustrates the importance of the theory of evolution in the field of medicine?

A
Organisms in Petri dish A have a mechanism that produces the same neurotoxin as the rest.
B
Organisms in Petri dish B have the largest cells relative to the rest.
C
Organisms in Petri dish C have twice as many genes on their DNA.
D
Organisms in Petri dish D have a mutation that allows them to survive treatment with medication.
3

Dichotomous keys are constructed based on

A
combinations of characteristics in unknown organisms.
B
combinations of characteristics in known organisms.
C
genetic sequences in unknown organisms.
D
genetic sequences in known organisms.
4

How does conservation affect biodiversity?

A
It decreases species diversity.
B
It helps to preserve climate change.
C
It decreases ecosystem diversity.
D
It helps to preserve biodiversity.
5

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
Jellyfish, trilobites, and ammonites lived together.
B
Ammonites existed before trilobites and jellyfish.
C
Trilobites existed before jellyfish and ammonites.
D
Jellyfish existed before trilobites and ammonites.
6

Which is a negative effect of rising ocean temperatures?

A
the drying out of fertile land and the formation of dust bowls
B
the decreased frequency of major storms
C
the flooding of low-lying coastal areas
D
the faster evaporation of water in the soil
7

Which phrase describes faults?

A
are igneous rocks that form beneath Earth’s surface
B
cause rocks to break and move
C
are older than surrounding rocks
D
cause gaps in the geologic record
9

Which effect is one likely result of a forest fire?

A
speciation
B
extinction
C
adaptation
D
forced migration
10

Which animals form a eusocial society?

A
moose
B
ants
C
cheetahs
D
polar bears
12

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

A
Two species cannot occupy the same niche in the same habitat.
B
If two species have the same niche, one species will always become extinct.
C
If two species have the same niche, one species will always move.
D
Two species are able to occupy the same niche in the same habitat.
13

The Great Pacific Garbage Patch is an area in the North Pacific Ocean that contains trash and causes harm to ocean life and those that consume that life. What lessons can be learned from this floating pile of trash?

A
There are more polluters in the Pacific Ocean than in the Atlantic Ocean.
B
There is no relationship between our daily activities and the environment.
C
There are areas of the ocean to avoid with boats.
D
There is a relationship among all living things on Earth.
18

Variations within a species are an important part of Charles Darwin's theory of evolution. Which example can be explained by individual variation?

A
Owls and foxes compete fiercely against each other for small rodents in their habitat.
B
A population of brown bears has doubled in the past 10 years as its habitat size has increased.
C
Brightly colored cardinals are better able to survive and to reproduce than darker cardinals.
D
The food source in a lake is not enough to support the bass population, but it can support the trout.
20

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

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

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