Unit Test — Cumulative exam Answers

50 verified answers
23

Which is a requirement for natural selection to occur?

A
heritable variations for some traits
B
the ability of an organism to improve a trait during its lifetime
C
equal probability of survival for all offspring
D
fewer offspring than the environment can support
26

Which most clearly shows evolutionary relationships between species?

A
binomial nomenclature
B
phylogenetic tree
C
common name
D
morphological data
27

Which is an advantage of flowering plants?

A
Flowers attract insects that transport gametes.
B
Flowers give greater access to sunlight.
C
Flowers help transport water and nutrients.
D
Flowers assist plants that live in the water.
29

Which best describes an adaptation that could be found in a fish that lives in a slow-flowing stream?

A
the ability to attract prey by glowing
B
extra gills, for oxygen extraction
C
the ability to grow larger
D
extra fat, for warmth
30

Smallpox is a virus that causes a rash that then turns into painful blisters. The last known case of smallpox was in 1977. What is the best explanation for the eradication of smallpox?

A
People are exercising more than they used to.
B
Genetic testing determines who is more prone to smallpox.
C
There was an increase in antibacterial products.
D
An effective vaccine was developed.
32

Sophie says dolphins and sharks look very similar, so they must be related. Jake disagrees, saying DNA evidence has shown that dolphins and other aquatic mammals are actually more closely related to the ancestors of modern hippos. Who is correct using the modern system of classification?

A
Sophie is correct because dolphins look more like sharks than like hippos.
B
Jake is correct because classification is based on evolutionary relationships.
C
Both are correct because traditional and modern classifications can overlap.
D
Neither is correct because neither is taking into account both the traditional and modern systems
33

Antoinette was diagnosed with hypertension, a noncommunicable disease in which her blood pressure is higher than normal. What is the most likely explanation for why she is hypertensive?

A
She had a diet high in salt intake.
B
She did not wash her hands enough.
C
She was bitten by a mosquito.
D
She was never vaccinated against hypertension.
35

A weakened immune system may be caused by

A
an overproduction of lysozymes.
B
muscle disorders.
C
immunodeficiency disorders.
D
complement systems in the blood.
36

There is an algal bloom in a bay in a populated area. As the leading marine biologist in the area, what is the most important thing to do, based on scientific evidence about such blooms?

A
warn people about which food is safe to eat
B
develop a strategy to prevent future algal blooms
C
encourage people to go clean the affected area
D
evacuate all wildlife from the bay
38

Which organism is an animal-like protist?

A
cilia
B
dinoflagellate
C
amoeba
D
truffle
39

What is the function of the hormone progesterone?

A
preparation of the body for maintaining pregnancy
B
development of male secondary sex characteristics
C
development of female secondary sex characteristics
D
preparation of the fallopian tube for fertilization
40

Which of these can be found in both gymnosperms and angiosperms?

A
vascular tissue and exposed seeds
B
vascular tissue and seeds
C
flowers and vascular tissue
D
enclosed seeds and flowers

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