Q: Which of the following equations represents the overall reaction for aerobic respiration of glucose?

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

Question 1

Which of the following best describes the difference between macronutrients and micronutrients in microbial nutrition?

Accepted Answer

Macronutrients are required in large amounts for cell structure and function, while micronutrients are needed in small amounts for enzyme activity and as cofactors.

Question 2

A bacterium that uses inorganic compounds as an energy source and CO$_2$ as its carbon source is classified as which of the following?

Accepted Answer

Chemolithoautotroph

Question 3

Which of the following bonds in ATP is considered a high-energy bond that is hydrolyzed to release energy for cellular processes?

Accepted Answer

Phosphoanhydride bond

Question 4

During glycolysis, what are the net inputs and outputs per molecule of glucose?

Accepted Answer

Inputs: 1 glucose, 2 ATP, 2 NAD+; Outputs: 2 pyruvate, 4 ATP (2 net), 2 NADH

Question 5

Which of the following statements correctly compares fermentation and respiration in bacteria?

Accepted Answer

Fermentation uses an organic molecule as the final electron acceptor, while respiration uses an inorganic molecule such as oxygen.

Question 6

Which of the following best describes the function of the electron transport chain (ETC) in bacterial respiration?

Accepted Answer

It generates a proton motive force by transferring electrons through a series of carriers with increasing reduction potentials.

Question 7

A patient presents with severe dehydration and 'rice water' stools after traveling to a developing country. Which of the following is the most likely cause?

Accepted Answer

Vibrio cholerae infection leading to cholera toxin-induced fluid loss

Question 8

Which of the following equations represents the overall reaction for aerobic respiration of glucose?

Accepted Answer

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

Question 9

Which of the following is a key advantage of fermentation for microbes in certain environments?

Accepted Answer

It allows ATP production in the absence of oxygen.

Question 10

Which of the following best explains how ATP synthase generates ATP during oxidative phosphorylation?

Accepted Answer

By using the energy from the proton motive force to drive the phosphorylation of ADP to ATP

Question 11

Which of the following is NOT a macronutrient required by microbes in large amounts?

Accepted Answer

Iron

Question 12

A chemolithotroph is most likely to be found in which domain of life?

Accepted Answer

Bacteria

Question 13

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is generated by the direct transfer of a phosphate group from a high-energy substrate to ADP.

Question 14

Which of the following statements about the redox tower is correct?

Accepted Answer

Electron donors are found at the top of the tower and have more negative reduction potentials.

Question 15

A microbe that can use both organic and inorganic compounds as energy sources is best described as a:

Accepted Answer

Mixotroph

Question 16

Which of the following is a common final electron acceptor in anaerobic respiration?

Accepted Answer

Nitrate ($NO_3^-$)

Question 17

Which of the following best explains why cholera can be rapidly fatal if untreated?

Accepted Answer

The cholera toxin causes massive fluid loss through diarrhea, leading to severe dehydration.

Question 18

Which of the following is a key characteristic of catabolic pathways in microbial metabolism?

Accepted Answer

They break down complex molecules and release energy.

Question 19

Which of the following is the best method to prevent cholera outbreaks in a community?

Accepted Answer

Ensuring access to safe drinking water and proper sewage treatment

Question 20

Which of the following best describes the role of enzymes in microbial metabolism?

Accepted Answer

They lower the activation energy of chemical reactions, increasing the reaction rate.

Microbial Metabolism I & II: Nutrients, Pathways, and Energy Conservation

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