Q: Which equation correctly represents the net reaction of glycolysis?

$$\text{Glucose} + 2 \text{ATP} + 2 \text{ADP} + 2 \text{PO}_4$$^{3-}$$ + 2 \text{NAD}^+ \rightarrow 2 \text{Pyruvic acid} + 4 \text{ATP} + 2 \text{NADH} + 2 \text{H}^+$$

Q: Which of the following is a correct equation for the oxidation-reduction reaction involving NAD$$^+$$?

$$\text{NAD}^+ + 2\text{H} \rightarrow \text{NADH} + \text{H}^+$$

Question 1

Which statement best describes the role of ATP in microbial metabolism?

Accepted Answer

ATP stores energy released from catabolism and provides energy for anabolism.

Question 2

Which of the following is TRUE regarding enzymes in metabolic pathways?

Accepted Answer

Enzymes are encoded by genes and determine the sequence of metabolic pathways.

Question 3

According to collision theory, what is required for a chemical reaction to occur?

Accepted Answer

Atoms, ions, and molecules must collide with sufficient activation energy.

Question 4

Which equation correctly represents the net reaction of glycolysis?

Accepted Answer

$$	ext{Glucose} + 2 	ext{ATP} + 2 	ext{ADP} + 2 	ext{PO}_4$$^{3-}$$ + 2 	ext{NAD}^+ ightarrow 2 	ext{Pyruvic acid} + 4 	ext{ATP} + 2 	ext{NADH} + 2 	ext{H}^+$$

Question 5

Which of the following best explains how enzymes lower the activation energy of a reaction?

Accepted Answer

Enzymes provide an alternative reaction pathway with lower activation energy.

Question 6

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Competing with the substrate for the active site, preventing substrate binding.

Question 7

Which coenzyme is primarily involved in the transfer of electrons during cellular respiration?

Accepted Answer

NAD+

Question 8

During the preparatory reaction of cellular respiration, what happens to pyruvate?

Accepted Answer

It is oxidized and decarboxylated to form acetyl CoA and CO$$_2.$$

Question 9

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

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

Question 10

In the electron transport chain, what is the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$	ext{O}_2)$$

Question 11

Which metabolic pathway produces both NADPH and ribose-5-phosphate for biosynthesis?

Accepted Answer

Pentose phosphate pathway

Question 12

Which of the following is NOT a product of the Krebs cycle per turn?

Accepted Answer

Two FADH$$_2$$

Question 13

Which process is defined as the release of energy from the oxidation of organic molecules without the use of oxygen, the Krebs cycle, or the electron transport chain?

Accepted Answer

Fermentation

Question 14

Which of the following is a correct equation for the oxidation-reduction reaction involving NAD$$^+$$?

Accepted Answer

$$	ext{NAD}^+ + 2	ext{H} ightarrow 	ext{NADH} + 	ext{H}^+$$

Question 15

Which type of enzyme catalyzes the transfer of functional groups from one molecule to another?

Accepted Answer

Transferase

Question 16

A bacterium is found to use the Entner-Doudoroff pathway. Which of the following is most likely TRUE about this organism?

Accepted Answer

It produces 2 NADPH and 1 ATP per glucose and does not use glycolysis.

Question 17

Which of the following would most likely result if the temperature and pH are outside the optimal range for a microbial enzyme?

Accepted Answer

The enzyme will denature and lose its catalytic activity.

Question 18

Which of the following is a correct description of feedback inhibition?

Accepted Answer

The end product of a metabolic pathway inhibits an enzyme involved early in the pathway.

Question 19

Which metabolic process is responsible for the spoilage of food by microorganisms and the production of alcoholic beverages?

Accepted Answer

Fermentation

Question 20

Which of the following statements about holoenzymes is correct?

Accepted Answer

A holoenzyme is the active form, composed of an apoenzyme and its cofactor.

Microbial Metabolism: Enzymes, Pathways, and Energy Production

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