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Test Bank for Biological Science 7th Edition 2024/2025 WITH WELL ELABORATED questions and correct answers
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Test Bank for Biological Science 7th Edition 2024/2025 WITH WELL ELABORATED questions and correct answers Assume that some members of an aquatic species of motile, photosynthetic protists evolve to become parasitic to fish. They gain the ability to live in the fish gut, absorbing nutrients as ...

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  • October 1, 2024
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  • 2024/2025
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Test Bank for Biological Science 7th Edition
2024/2025 WITH WELL ELABORATED
questions and correct answers
Assume that some members of an aquatic species of motile, photosynthetic protists
evolve to become parasitic to fish. They gain the ability to live in the fish gut, absorbing
nutrients as the fish digests food. Over time, which of the following phenotypic changes
would you expect to observe in this population of protists?

A) loss of motility
B) loss of chloroplasts
C) gain of a rigid cell wall
D) gain of meiosis
E) no changes would be expected - CORRECT ANSWERB) loss of chloroplasts

Cultures of the same species of diatom referred to in the previous question were treated
with BDM, a reversible inhibitor of myosin function. Which of the following predictions is
consistent with the hypothesis that an actin-myosin interaction is necessary for motility?

A) BDM will significantly decrease motility of the cells in culture.
B) BDM will not significantly alter motility of the cells in culture.
C) BDM will significantly increase motility of the cells in culture. - CORRECT
ANSWERA) BDM will significantly decrease motility of the cells in culture.

Consider the following points: (a) All excavates live in environments where oxygen
availability is low; (b) all excavates lack mitochondria; and (c) all excavates have some
mitochondrial genes. Based on this information, which of the following statements is
true of the excavate lineage?

A) Their ancestors were eukaryotes that existed prior to the origin of mitochondria.
B) Their ancestors had mitochondria, but the mitochondria were lost over time.
C) Their ancestors were not able to metabolize glucose.
D) Excavates are in the process of acquiring mitochondria through evolutionary
adaptation. - CORRECT ANSWERB) Their ancestors had mitochondria, but the
mitochondria were lost over time.

You discover a new lineage of protists. You examine several species of this lineage
under the microscope and find a distinctive feature that sets them apart from other
protists. Following the nomenclature style used to name the lineage Discicristata, you
decide to name this new lineage Spherocristata. What is the distinctive feature that is
reflected in the name?

A) a perfectly round nucleus

, B) spherical cristae within their mitochondria
C) flagella that beat in a circle
D) spherical thylakoids within their chloroplasts
E) perfectly round lysosomes - CORRECT ANSWERB) spherical cristae within their
mitochondria
Which of the following protists causes the human disease malaria?

A) Giardia
B) Plasmodium
C) Trichomonas
D) Leishmania - CORRECT ANSWERB) Plasmodium

Encouraging the growth (via nutrient fertilization) of photosynthetic protists in marine
environments may help reduce global warming. Why?

A) Photosynthetic protists give off a lot of carbon dioxide, and fertilizing them would
increase carbon dioxide levels in the atmosphere.
B) Photosynthetic protists fix atmospheric carbon dioxide, decreasing carbon dioxide
levels in the atmosphere.
C) Photosynthetic protists use a lot of oxygen, and fertilizing them would decrease
oxygen levels in the environment.
D) Photosynthetic protists would release a lot of oxygen, and fertilizing them would
increase levels of oxygen in the atmosphere. - CORRECT ANSWERB) Photosynthetic
protists fix atmospheric carbon dioxide, decreasing carbon dioxide levels in the
atmosphere.

How are algal blooms (red tides) typically harmful to humans?

A) The blooms destroy shellfish and other food sources for humans.
B) Shellfish eat the harmful algae, and humans eat the contaminated shellfish.
C) Humans can become poisoned when swimming in contaminated water.
D) All of the above answers apply. - CORRECT ANSWERD) All of the above answers
apply.

Phytoplankton is comprised of photosynthetic protists and bacteria. For the most part,
humans do not consume phytoplankton. Why, then, are they important to humans?

A) They are food for many marine organisms that humans eat.
B) They release a lot of carbon dioxide into the atmosphere.
C) They cause serious illness in humans.
D) They are not important to humans. - CORRECT ANSWERA) They are food for many
marine organisms that humans eat.

Which of the following statements is consistent with the assertion that protists are
paraphyletic?
A) The common ancestor of all protists evolved into other eukaryotic groups.

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