Q: Which of the following reactions represents the formation of ATP from acetyl-phosphate?

$$\mathrm{Acetyl\text{-}phosphate} + \mathrm{ADP} \rightarrow \mathrm{Acetate} + \mathrm{ATP}$$

Question 1

Which of the following best describes substrate-level phosphorylation in microbial metabolism?

Accepted Answer

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

Question 2

During alcohol fermentation, which of the following is the correct overall reaction for the conversion of glucose?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} \rightarrow 2\ \mathrm{C_2H_5OH} + 2\ \mathrm{CO_2$}$$

Question 3

Which energy-rich compound is commonly used to couple substrate-level phosphorylation in glycolysis?

Accepted Answer

1,3-bisphosphoglycerate

Question 4

In lactic acid fermentation, what is the final electron acceptor?

Accepted Answer

Pyruvate

Question 5

Which of the following statements about fermentative microorganisms is TRUE?

Accepted Answer

They can grow in the absence of external electron acceptors.

Question 6

Which metabolic pathway is responsible for the production of butanediol in certain enteric bacteria?

Accepted Answer

Butanediol fermentation

Question 7

What is the main purpose of hydrogen ($$\mathrm{H_2$}) $$production during fermentation in some bacteria?

Accepted Answer

To achieve redox balance by disposing of excess electrons.

Question 8

Which of the following is a distinguishing feature of heterofermentative lactic acid bacteria compared to homofermentative lactic acid bacteria?

Accepted Answer

They produce both lactic acid and other products such as ethanol and CO$$_2.$$

Question 9

Which of the following reactions represents the formation of ATP from acetyl-phosphate?

Accepted Answer

$$\mathrm{Acetyl	ext{-}phosphate} + \mathrm{ADP} ightarrow \mathrm{Acetate} + \mathrm{ATP}$$

Question 10

Which of the following is NOT a product of mixed-acid fermentation in enteric bacteria?

Accepted Answer

Butanediol

Question 11

A microbiologist isolates a bacterium that produces gas bubbles in a glucose broth but not in a lactose broth. Which metabolic process is most likely responsible for the gas production?

Accepted Answer

Alcohol fermentation

Question 12

Which of the following best explains why fermentative microorganisms face energetic challenges compared to those using respiration?

Accepted Answer

Fermentation yields less ATP per glucose molecule than respiration.

Question 13

Which of the following compounds is NOT typically considered energy-rich for substrate-level phosphorylation?

Accepted Answer

Pyruvate

Question 14

In the Stickland reaction, what is the role of paired amino acids?

Accepted Answer

One amino acid is oxidized and the other is reduced to achieve redox balance.

Question 15

Which process is illustrated by the following equation?
$$\mathrm{Glucose} + 2\ \mathrm{ADP} + 2\ \mathrm{P_i} \rightarrow 2\ \mathrm{Lactate} + 2\ \mathrm{ATP}$$

Accepted Answer

Lactic acid fermentation

Question 16

Which of the following is a major order of Proteobacteria known for its metabolic diversity?

Accepted Answer

Enterobacteriales

Question 17

Which of the following best describes flavin-based electron bifurcation?

Accepted Answer

A process where electrons from a single donor are split to reduce two different acceptors with different redox potentials.

Question 18

Which of the following is TRUE regarding the arrangement of iron-sulfur centers in nonheme iron-sulfur proteins?

Accepted Answer

Iron atoms are coordinated by cysteine residues in the protein.

Question 19

A patient presents with symptoms of botulism after consuming improperly canned food. Which metabolic process is most likely associated with the causative microorganism?

Accepted Answer

Strict anaerobic fermentation

Metabolic and Phylogenetic Diversity of Microorganisms: Fermentation Pathways and Energy Generation

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