Question 1

Which of the following best describes a photoautotroph?

Accepted Answer

An organism that uses light as an energy source and CO$$_2 as a $$carbon source.

Question 2

Which process is used by chemoautotrophs to fix carbon?

Accepted Answer

Calvin-Benson cycle

Question 3

Which of the following is a distinguishing feature of oxygenic photosynthesis?

Accepted Answer

It produces O$$_2 as a $$byproduct.

Question 4

A bacterium that uses light for energy and organic compounds for carbon is classified as a:

Accepted Answer

Photoheterotroph

Question 5

Which of the following equations correctly represents the general reaction for oxygenic photosynthesis?

Accepted Answer

$$6CO_2 + 12H_2O + light \rightarrow C_6H_{12}O_6$ + 6O_2 + 6H_2O$$

Question 6

Which group of organisms is most likely to be found in deep-sea hydrothermal vents, using inorganic chemicals for energy?

Accepted Answer

Chemoautotrophs

Question 7

Which of the following statements about chemoheterotrophs is TRUE?

Accepted Answer

They obtain both energy and carbon from organic compounds.

Question 8

A green sulfur bacterium uses H$$_2S to $$reduce CO$$_2$$ and does not produce O$$_2. $$What type of metabolism does it have?

Accepted Answer

Anoxygenic photoautotrophy

Question 9

Which of the following best explains why photoheterotrophs cannot use CO$$_2 as $$their sole carbon source?

Accepted Answer

They lack the Calvin-Benson cycle.

Question 10

Which of the following is a medically and economically important group due to their metabolic diversity?

Accepted Answer

Chemoheterotrophs

Question 11

A researcher isolates a microorganism that uses organic compounds as an electron donor and oxygen as the final electron acceptor. Which nutritional classification does this organism belong to?

Accepted Answer

Chemoheterotroph

Question 12

Which of the following is NOT a possible energy source for chemoautotrophs?

Accepted Answer

Light

Question 13

Which of the following best describes the role of the Calvin-Benson cycle in microbial metabolism?

Accepted Answer

It fixes CO$$_2$$ into organic molecules.

Question 14

Which of the following scenarios best illustrates the application of metabolic diversity in biotechnology?

Accepted Answer

Using photoautotrophic algae to produce biofuels from CO$$_2$$ and sunlight.

Question 15

Which of the following is a correct pairing of organism type and its energy and carbon sources?

Accepted Answer

Chemoautotroph: inorganic chemicals for energy, CO$$_2$$ for carbon

Microbial Metabolism and Metabolic Diversity

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