Question 1

Which crop plant would likely have a mutualistic relationship with Rhizobium bacteria?

Accepted Answer

A)  Potatoes
B)   Peas
C)  Corn
D)   Wheat
E)   CottonF) B) and E)
G) A) and E)

Question 2

Which microorganism is considered phytoplankton?

Accepted Answer

A)  Cyanobacteria
B)  Mycorrhizae
C)  Nitrogen fixing bacteria
D)  Sulfate reducersE) A) and D)
F) All of the above

Question 3

Why are waterlogged soils often infertile?

Accepted Answer

A)  The lack of physical space in this type of soil blocks bacterial growth.
B)  Water molecules are used instead of oxygen for cellular respiration.
C)  There is less carbon in waterlogged soil than dry soil.
D)  Nitrifying bacteria require oxygen, and the excess water takes the place of oxygen-containing air.E) A) and B)
F) A) and C)

Question 4

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

Accepted Answer

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

Question 5

Which trophic level forms the base of a food chain?

Accepted Answer

A)  Primary producers
B)  Quaternary consumers
C)  Tertiary consumers
D)  Secondary consumers
E)  Primary consumersF) B) and E)
G) A) and B)

Question 6

Organisms that inhabit soil or water and breakdown and absorb the organic matter of dead organisms are called ______.

Accepted Answer

A)  autotrophs
B)  decomposers
C)  secondary consumers
D)  primary consumersE) A) and D)
F) B) and D)

Question 7

Consider a deep sea hydrothermal vent.Which of the following statements is incorrect?

Accepted Answer

A)  Its biome is the deep marine biopshere.
B)  The vent hosts communities of chemolithotrophic bacteria.
C)  The associated chemolithotrophs are primary producers.
D)  The vent is a habitat.E) A) and B)
F) All of the above

Question 8

The energy of the sun is converted into chemical energy during ______.

Accepted Answer

A)  nitrification
B)  denitrification
C)  photosynthesis
D)  ammonification
E)  nitrogen fixationF) C) and D)
G) A) and E)

Question 9

The conversion of gaseous nitrogen (N2)  to ammonia (NH4+)  occurs during ______.

Accepted Answer

A)  denitrification
B)  nitrogen fixation
C)  ammonification
D)  nitrification
E)  photosynthesisF) B) and C)
G) D) and E)

Question 10

A Paramecium is an example of a ______.

Accepted Answer

A)  primary consumer
B)  primary producer
C)  quaternary consumer
D)  tertiary consumer
E)  secondary consumerF) B) and D)
G) A) and B)

Question 11

The major group of organisms that fix nitrogen into ammonia and then oxidize it to nitrate are ______.

Accepted Answer

A)  bacteria
B)   fungi
C)   protozoa
D)   algaeE) A) and D)
F) None of the above

Question 12

The majority of Earth's water is found in ______.

Accepted Answer

A)  icecaps and glaciers
B)  oceans
C)  freshwater lakes
D)  soil moisture
E)  ground waterF) A) and B)
G) None of the above

Question 13

Most of the organic sulfur is located in

Accepted Answer

A)  nucleotides and nucleic acids.
B)  monosaccharides and carbohydrates.
C)   amino acids and proteins.
D)  fatty acids and lipids.E) A) and B)
F) A) and C)

Question 14

The total amount of water in the hydrologic cycle has been decreasing over the last million years.

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

You have been diagnosed with neurotoxic poisoning after having ingested an algal toxin, called brevetoxin, produced by Karenia brevis.In which food did you likely consume this?

Accepted Answer

A)  Freshwater trout
B)  Canned tuna
C)  Oysters
D)  TomatoesE) B) and D)
F) B) and C)

Exam 24: Microbes and the Environment

Which trophic level forms the base of a food chain?

Correct Answer
verified

Most of the organic sulfur is located in

Correct Answer
verified

Which crop plant would likely have a mutualistic relationship with Rhizobium bacteria?

Correct Answer
verified

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

Correct Answer
verified

The major group of organisms that fix nitrogen into ammonia and then oxidize it to nitrate are ______.

Correct Answer
verified

Why are waterlogged soils often infertile?

Correct Answer
verified

Organisms that inhabit soil or water and breakdown and absorb the organic matter of dead organisms are called ______.

Correct Answer
verified

You have been diagnosed with neurotoxic poisoning after having ingested an algal toxin, called brevetoxin, produced by Karenia brevis.In which food did you likely consume this?

Correct Answer
verified

A Paramecium is an example of a ______.

Correct Answer
verified

The energy of the sun is converted into chemical energy during ______.

Correct Answer
verified

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

Correct Answer
verified

The total amount of water in the hydrologic cycle has been decreasing over the last million years.

Correct Answer
verified

Which microorganism is considered phytoplankton?

Correct Answer
verified

The majority of Earth's water is found in ______.

Correct Answer
verified

The conversion of gaseous nitrogen (N₂) to ammonia (NH₄⁺) occurs during ______.

Correct Answer
verified

Consider a deep sea hydrothermal vent.Which of the following statements is incorrect?

Correct Answer
verified

Exam 24: Microbes and the Environment

Which trophic level forms the base of a food chain?

Correct AnswerverifiedShow Answer

Most of the organic sulfur is located in

Correct AnswerverifiedShow Answer

Which crop plant would likely have a mutualistic relationship with Rhizobium bacteria?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The major group of organisms that fix nitrogen into ammonia and then oxidize it to nitrate are ______.

Correct AnswerverifiedShow Answer

Why are waterlogged soils often infertile?

Correct AnswerverifiedShow Answer

Organisms that inhabit soil or water and breakdown and absorb the organic matter of dead organisms are called ______.

Correct AnswerverifiedShow Answer

You have been diagnosed with neurotoxic poisoning after having ingested an algal toxin, called brevetoxin, produced by Karenia brevis.In which food did you likely consume this?

Correct AnswerverifiedShow Answer

A Paramecium is an example of a ______.

Correct AnswerverifiedShow Answer

The energy of the sun is converted into chemical energy during ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The total amount of water in the hydrologic cycle has been decreasing over the last million years.

Correct AnswerverifiedShow Answer

Which microorganism is considered phytoplankton?

Correct AnswerverifiedShow Answer

The majority of Earth's water is found in ______.

Correct AnswerverifiedShow Answer

The conversion of gaseous nitrogen (N2) to ammonia (NH4+) occurs during ______.

Correct AnswerverifiedShow Answer

Consider a deep sea hydrothermal vent.Which of the following statements is incorrect?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
verified

The conversion of gaseous nitrogen (N₂) to ammonia (NH₄⁺) occurs during ______.

Correct Answer
verified

Correct Answer
verified