Question 1

Which environment represents the largest pool of microbial genes?

Accepted Answer

A)   Oceans
B)   Freshwater lakes
C)   Rainforest
D)   Humans and animals
E)   SoilF) A) and C)
G) A) and B)

Question 2

The three components that interact for one health are _______.

Accepted Answer

A)   the environment, humans, and animals
B)   prokaryotes, eukaryotes, and viruses
C)   bacteria, archaea, and eukaryotes
D)   producers, consumers, and decomposersE) None of the above
F) C) and D)

Question 3

Toxic substances accumulate through natural trophic ﬂow of an ecosystem.

Accepted Answer

A) True 
 B)False

Question 4

Phytoplankton is composed of protozoa and small invertebrates.

Accepted Answer

A) True 
 B)False

Question 5

The oxidation of ammonia (NH₄+)  to nitrate (NO3-)  and nitrite (NO₂-)  is called ______.

Accepted Answer

A)   denitriﬁcation
B)   photosynthesis
C)   ammoniﬁcation
D)   nitriﬁcation
E)   nitrogen ﬁxationF) All of the above
G) A) and B)

Question 6

Heterotrophs include _______.

Accepted Answer

A)   producers only
B)   consumers only
C)   consumers and decomposers
D)   producers and consumers
E)   producers, consumers, and decomposersF) None of the above
G) B) and D)

Question 7

You have been using massive amounts of weed killer and insecticide to kill weeds in your yard, as well as the grubs and aphids that are munching on your roses and your grass. What effect might this have from a microbiological standpoint?

Accepted Answer

A)   Loss of microbial diversity in the soil
B)   Reduction in microbial numbers in the soil
C)   Damage to the nitrogen ?xing bacteria
D)   Damage to the mycorrhizae
E)   All of the choices are correct.F) A) and B)
G) A) and E)

Question 8

Scientists have learned the full extent of viral abundance on earth because _______.

Accepted Answer

A)   viruses are known to grow on all life forms: animal, plant, fungi, and bacteria
B)   metagenomic sequencing has identiﬁed viruses in a broad variety of environments
C)   the ﬁnal step of the viral life cycle, release of mature viruses and cell lysis, releases millions of viruses
D)   a wide variety of microbes is available to act as hosts for these virusesE) None of the above
F) C) and D)

Question 9

Which of the following statements regarding the phosphorus cycle is incorrect?

Accepted Answer

A)   Thiobacillus produces sulfuric acid that dissolves phosphate rock.
B)   Phosphorus mineralization occurs by microbial action.
C)   Phosphorus must be phosphatized to enter biological systems.
D)   The phosphorus pool is in sedimentary rock.
E)   Phosphorus is released naturally by mining.F) C) and E)
G) A) and D)

Question 10

Select the statement that explains the usefulness of metagenomic analysis in research today.

Accepted Answer

A)   It evaluates microbial diversity in a habitat.
B)   It allows the identiﬁcation of unculturable microorganisms.
C)   It detects the abundance of microorganisms in an environment.
D)   All of these are correct statements.E) B) and D)
F) None of the above

Question 11

The thin envelope of life that surrounds the earth's surface is called the ______.

Accepted Answer

A)   atmosphere
B)   ecosystem
C)   lithosphere
D)   hydrosphere
E)   biosphereF) B) and C)
G) A) and E)

Question 12

Chemical elements needed in trace amounts for biochemical reactions have a biogeochemical cycle, including boron, chromium, manganese, and cobalt.

Accepted Answer

A) True 
 B)False

Question 13

Which organism is a nitrogen-?xing symbiont of legumes?

Accepted Answer

A)   Rhizobium
B)   Pseudomonas
C)   Nitrobacter
D)   ClostridiumE) All of the above
F) A) and B)

Question 14

The warmest area of a lake during the summer is the ______.

Accepted Answer

A)   benthic zone
B)   thermocline
C)   hypolimnion
D)   epilimnion
E)   limnionF) B) and E)
G) A) and E)

Question 15

Considering the human body as an ecosystem, which of the following statements is incorrect?

Accepted Answer

A)   Energy for the human microbiome derives exclusively from the food we eat.
B)   The microbiota in the human gut is comprised of heterotrophs.
C)   The human ecosystem lacks an autotrophic niche.
D)   Microbes act as producers, consumers, and decomposers within the human ecosystem.E) A) and C)
F) A) and B)

Question 16

The thermocline is broken down by temperature changes that allow upwelling to occur.

Accepted Answer

A) True 
 B)False

Exam 24: Microbes and the Environment

The thermocline is broken down by temperature changes that allow upwelling to occur.

Correct Answer
verified

Which organism is a nitrogen-?xing symbiont of legumes?

Correct Answer
verified

You have been using massive amounts of weed killer and insecticide to kill weeds in your yard, as well as the grubs and aphids that are munching on your roses and your grass. What effect might this have from a microbiological standpoint?

Correct Answer
verified

Which environment represents the largest pool of microbial genes?

Correct Answer
verified

Select the statement that explains the usefulness of metagenomic analysis in research today.

Correct Answer
verified

The warmest area of a lake during the summer is the ______.

Correct Answer
verified

Which of the following statements regarding the phosphorus cycle is incorrect?

Correct Answer
verified

The three components that interact for one health are _______.

Correct Answer
verified

The thin envelope of life that surrounds the earth's surface is called the ______.

Correct Answer
verified

Chemical elements needed in trace amounts for biochemical reactions have a biogeochemical cycle, including boron, chromium, manganese, and cobalt.

Correct Answer
verified

Phytoplankton is composed of protozoa and small invertebrates.

Correct Answer
verified

Toxic substances accumulate through natural trophic ﬂow of an ecosystem.

Correct Answer
verified

The oxidation of ammonia (NH₄+) to nitrate (NO3-) and nitrite (NO₂-) is called ______.

Correct Answer
verified

Heterotrophs include _______.

Correct Answer
verified

Scientists have learned the full extent of viral abundance on earth because _______.

Correct Answer
verified

Considering the human body as an ecosystem, which of the following statements is incorrect?

Correct Answer
verified

Exam 24: Microbes and the Environment

The thermocline is broken down by temperature changes that allow upwelling to occur.

Correct AnswerverifiedShow Answer

Which organism is a nitrogen-?xing symbiont of legumes?

Correct AnswerverifiedShow Answer

You have been using massive amounts of weed killer and insecticide to kill weeds in your yard, as well as the grubs and aphids that are munching on your roses and your grass. What effect might this have from a microbiological standpoint?

Correct AnswerverifiedShow Answer

Which environment represents the largest pool of microbial genes?

Correct AnswerverifiedShow Answer

Select the statement that explains the usefulness of metagenomic analysis in research today.

Correct AnswerverifiedShow Answer

The warmest area of a lake during the summer is the ______.

Correct AnswerverifiedShow Answer

Which of the following statements regarding the phosphorus cycle is incorrect?

Correct AnswerverifiedShow Answer

The three components that interact for one health are _______.

Correct AnswerverifiedShow Answer

The thin envelope of life that surrounds the earth's surface is called the ______.

Correct AnswerverifiedShow Answer

Chemical elements needed in trace amounts for biochemical reactions have a biogeochemical cycle, including boron, chromium, manganese, and cobalt.

Correct AnswerverifiedShow Answer

Phytoplankton is composed of protozoa and small invertebrates.

Correct AnswerverifiedShow Answer

Toxic substances accumulate through natural trophic ﬂow of an ecosystem.

Correct AnswerverifiedShow Answer

The oxidation of ammonia (NH₄+) to nitrate (NO3-) and nitrite (NO₂-) is called ______.

Correct AnswerverifiedShow Answer

Heterotrophs include _______.

Correct AnswerverifiedShow Answer

Scientists have learned the full extent of viral abundance on earth because _______.

Correct AnswerverifiedShow Answer

Considering the human body as an ecosystem, which of the following statements is incorrect?

Correct AnswerverifiedShow Answer

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