Question 1

Which of the following best describes the role of ATP in coupling anabolic and catabolic reactions in microbial metabolism?

Accepted Answer

ATP stores energy released from catabolic reactions and provides energy for anabolic reactions, effectively coupling the two processes.

Question 2

Which of the following statements about enzymes is TRUE?

Accepted Answer

Enzymes lower the activation energy required for a reaction, increasing the reaction rate.

Question 3

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 4

Which of the following is an example of a catabolic reaction?

Accepted Answer

Conversion of glucose to pyruvic acid during glycolysis.

Question 5

During oxidative phosphorylation, ATP is generated by:

Accepted Answer

Energy released from the transfer of electrons through the electron transport chain.

Question 6

Which of the following is NOT a component of a holoenzyme?

Accepted Answer

Substrate

Question 7

In the process of glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

$$2$$

Question 8

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

Accepted Answer

Electron Transport Chain

Question 9

What is the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 10

Which of the following statements about fermentation is CORRECT?

Accepted Answer

Fermentation can occur in the absence of oxygen and produces small amounts of ATP.

Question 11

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

Accepted Answer

Transferase

Question 12

Which process is responsible for the conversion of light energy into chemical energy in photosynthetic organisms?

Accepted Answer

Photophosphorylation

Question 13

Which of the following is TRUE regarding ribozymes?

Accepted Answer

Ribozymes are made of RNA and catalyze the cutting and splicing of other RNA molecules.

Question 14

Which of the following is a product of the Krebs cycle?

Accepted Answer

$$NADH$$

Question 15

Which metabolic process is most likely to occur in muscle cells during intense exercise when oxygen is limited?

Accepted Answer

Lactic acid fermentation

Question 16

Which of the following statements about metabolic diversity is CORRECT?

Accepted Answer

Chemotrophs obtain energy from chemicals, while phototrophs obtain energy from light.

Question 17

Which step in carbohydrate catabolism directly produces the most NADH per glucose molecule?

Accepted Answer

Krebs Cycle

Question 18

Which of the following is a consequence of denaturing an enzyme by high temperature or extreme pH?

Accepted Answer

The enzyme's active site loses its specific shape, reducing its catalytic activity.

Question 19

Which of the following is TRUE about lipid catabolism in microbes?

Accepted Answer

Lipid catabolism uses the energy-conserving stage of glycolysis and feeds products into the Krebs cycle.

Question 20

A bacterium is found to lack genes encoding enzymes for the electron transport chain. Which metabolic process is it UNABLE to perform?

Accepted Answer

Aerobic respiration

Microbial Metabolism: Enzymes, Energy, and Metabolic Pathways

Study Guide - Practice Questions