Q: Which equation correctly represents aerobic respiration in microbes?

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow \text{energy} + 6\mathrm{CO_2$} + 6\mathrm{H_2O}$$

Question 1

Which of the following best describes the relationship between catabolism and anabolism in microbial metabolism?

Accepted Answer

Catabolism breaks down large molecules to release energy, while anabolism uses energy to build large molecules from small ones.

Question 2

The first law of thermodynamics states that:

Accepted Answer

Energy can be transferred and transformed, but it cannot be created or destroyed.

Question 3

Which equation correctly represents aerobic respiration in microbes?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 	ext{energy} + 6\mathrm{CO_2$} + 6\mathrm{H_2O}$$

Question 4

Which of the following is a real-world application of microbial metabolism in environmental science?

Accepted Answer

Microbial metabolism is used in bioremediation to degrade petroleum hydrocarbons after oil spills.

Question 5

Which of the following statements about enzymes in metabolism is correct?

Accepted Answer

Each step in a metabolic pathway is catalyzed by a specific enzyme.

Question 6

During fermentation in Saccharomyces species, what is the main purpose of producing ethanol?

Accepted Answer

To regenerate NAD+ from NADH for glycolysis to continue.

Question 7

Which of the following best describes the role of ATP synthase in microbial cells?

Accepted Answer

It synthesizes ATP using the energy from the proton motive force as protons travel through the enzyme.

Question 8

A chemolithoautotroph obtains its energy and carbon from which sources?

Accepted Answer

Inorganic chemicals and CO$$_2$$

Question 9

Which of the following is a correct description of the Calvin-Benson cycle?

Accepted Answer

It is used by most autotrophs to fix CO$$_2$$ into organic molecules.

Question 10

Which of the following statements about the electron transport chain (ETC) in aerobic respiration is correct?

Accepted Answer

The ETC uses O$$_2 as $$the terminal electron acceptor and generates a proton gradient across the membrane.

Question 11

Which of the following is a key difference between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways generate ATP and reducing power, while anabolic pathways consume ATP and reducing power.

Question 12

Which of the following best explains why metabolic pathways are organized into discrete steps catalyzed by specific enzymes?

Accepted Answer

To enable regulation and control of metabolic flux and to prevent harmful intermediates from accumulating.

Question 13

Which of the following is a product of the light reactions in oxygenic photosynthesis?

Accepted Answer

O$$_2$$

Question 14

A bacterium that uses light as an energy source and CO$$_2 as a $$carbon source is classified as a:

Accepted Answer

Photoautotroph

Question 15

Which of the following is a correct statement about the nitrogen cycle in the environment?

Accepted Answer

Microbes are essential for converting nitrogen between its various forms, such as NH$$_3$$, NO$$_2^-$$, and NO$$_3^-.$$

Question 16

Which of the following best describes the function of precursor metabolites in anabolism?

Accepted Answer

They serve as starting substrates for biosynthetic pathways to build macromolecules.

Question 17

Which of the following is a major reason why anabolic and catabolic pathways are often physically separated in cells?

Accepted Answer

To prevent the simultaneous occurrence of opposing reactions and allow for independent regulation.

Question 18

In the context of microbial metabolism, what is the main function of NADH and NADPH?

Accepted Answer

NADH is primarily used in catabolic reactions to donate electrons, while NADPH is used in anabolic reactions to provide reducing power.

Question 19

A microbe is found to use NO$$_3^- as a $$terminal electron acceptor and produces NO$$_2^- as a $$product. Which metabolic process is this microbe most likely performing?

Accepted Answer

Anaerobic respiration

Question 20

Which of the following best explains why fermentation yields less ATP than aerobic respiration?

Accepted Answer

Fermentation does not use the electron transport chain and relies solely on substrate-level phosphorylation.

Microbial Metabolism: Pathways, Energy, and Biosynthesis

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