Q: Which of the following equations correctly represents substrate-level phosphorylation?

$$\mathrm{ADP} + \mathrm{P_{i}} + \text{energy from organic substrate} \rightarrow \mathrm{ATP}$$

Question 1

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

Accepted Answer

Catabolism provides energy and precursor metabolites for anabolism, and the two are linked through the cycling of ATP and building blocks.

Question 2

Which of the following equations correctly represents substrate-level phosphorylation?

Accepted Answer

$$\mathrm{ADP} + \mathrm{P_{i}} + 	ext{energy from organic substrate} ightarrow \mathrm{ATP}$$

Question 3

A competitive inhibitor of an enzyme acts by:

Accepted Answer

Binding to the active site, preventing the substrate from binding.

Question 4

Which coenzyme is reduced during glycolysis and carries electrons to the electron transport chain in aerobic respiration?

Accepted Answer

NAD+

Question 5

In the conversion of pyruvate to acetyl-CoA, which of the following occurs?

Accepted Answer

Pyruvate is decarboxylated, producing CO$$_2$$ and NADH.

Question 6

Which of the following is a correct summary of the net products from one glucose molecule after the Krebs cycle (citric acid cycle) is completed?

Accepted Answer

$$4\ \mathrm{CO_2$},\ 6\ \mathrm{NADH},\ 2\ \mathrm{$$FADH_2$$},\ 2\ \mathrm{ATP}$$

Question 7

Which process is responsible for the majority of ATP production during aerobic respiration?

Accepted Answer

Electron transport chain and chemiosmosis

Question 8

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation regenerates NAD+ by transferring electrons to an organic molecule such as pyruvate.

Question 9

Which pathway produces NADPH and five-carbon sugars for nucleotide biosynthesis?

Accepted Answer

Pentose phosphate pathway

Question 10

A bacterium is growing in an environment lacking oxygen but containing nitrate. Which metabolic process is it most likely using for energy production?

Accepted Answer

Anaerobic respiration

Question 11

Which of the following best explains why enzymes are considered catalysts?

Accepted Answer

They lower the activation energy required for a reaction to proceed.

Question 12

Which of the following is a consequence of denaturing an enzyme?

Accepted Answer

The enzyme's active site loses its specific shape, preventing substrate binding.

Question 13

Which of the following is NOT a function of catabolic pathways?

Accepted Answer

Synthesizing macromolecules from smaller units

Question 14

Which of the following best describes the role of NADH in cellular respiration?

Accepted Answer

It donates electrons to the electron transport chain, facilitating ATP production.

Question 15

Which of the following is a key regulatory mechanism in metabolic pathways to prevent overproduction of end products?

Accepted Answer

Feedback inhibition

Question 16

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

Accepted Answer

The ETC uses the energy from electrons to pump protons across a membrane, creating a gradient used to produce ATP.

Question 17

Which of the following is a correct description of oxidative phosphorylation?

Accepted Answer

ATP is produced using energy from the oxidation of organic molecules and the electron transport chain.

Question 18

Which of the following is a reason why cells might use the Entner-Doudoroff pathway instead of glycolysis?

Accepted Answer

It requires fewer enzymes and produces NADPH and different precursor metabolites needed for biosynthesis.

Question 19

Which of the following best describes the fate of amino acids during protein catabolism for energy?

Accepted Answer

Amino acids are deaminated and their carbon skeletons enter the Krebs cycle.

Microbial Metabolism: Pathways, Enzymes, and Energy Production

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