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

Question 1

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

Accepted Answer

Catabolism breaks down complex molecules to release energy, while anabolism builds complex molecules using energy.

Question 2

Which chemical reaction correctly represents ATP hydrolysis?

Accepted Answer

$$ATP + H_2O \rightarrow ADP + P_i + H^+$$

Question 3

During glycolysis, what is the net gain of ATP and NADH molecules per molecule of glucose?

Accepted Answer

2 ATP and 2 NADH

Question 4

Which process is responsible for generating ATP using a proton gradient and ATP synthase?

Accepted Answer

Chemiosmosis

Question 5

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

Accepted Answer

Oxygen ($$O_2)$$

Question 6

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactic acid ($$CH_3CH(OH)COOH)$$

Question 7

Which pathway is unique to certain Gram-negative bacteria and is an alternative to glycolysis for glucose catabolism?

Accepted Answer

Entner-Doudoroff pathway

Question 8

What is the role of NAD+ in cellular respiration?

Accepted Answer

It serves as an electron carrier, accepting electrons during redox reactions.

Question 9

Which of the following best explains why fermentation yields less ATP than aerobic respiration?

Accepted Answer

Fermentation does not utilize the electron transport chain.

Question 10

Which equation represents the overall reaction for aerobic respiration of glucose?

Accepted Answer

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

Question 11

Which type of phosphorylation occurs during glycolysis and the Krebs cycle?

Accepted Answer

Substrate-level phosphorylation

Question 12

A bacterium is growing in a medium with no oxygen but with nitrate ($$NO_3$$^-$$) available. Which metabolic process is most likely occurring?

Accepted Answer

Anaerobic respiration

Question 13

Which statement best describes the chemiosmotic model for ATP generation?

Accepted Answer

ATP is generated when protons flow down their gradient through ATP synthase.

Question 14

Which of the following is NOT a product of fermentation?

Accepted Answer

Water ($$H_2O)$$

Question 15

Which metabolic pathway is primarily responsible for the complete oxidation of acetyl-CoA to $$CO_2$$?

Accepted Answer

Krebs cycle

Question 16

In photosynthesis, which process fixes $$CO_2$$ into organic molecules?

Accepted Answer

Calvin cycle (light-independent reactions)

Question 17

Which of the following statements about oxidative phosphorylation is correct?

Accepted Answer

It uses the energy from electron transport to pump protons and generate ATP.

Question 18

Which nutritional pattern describes an organism that uses inorganic compounds as an energy source and $$CO_2 as a $$carbon source?

Accepted Answer

Chemoautotroph

Question 19

A mutation disables ATP synthase in a bacterium. Which process will be most directly affected?

Accepted Answer

Chemiosmotic ATP generation

Question 20

Which of the following best summarizes energy production in cells?

Accepted Answer

Cells capture energy from nutrients via catabolic pathways and store it as ATP.

Microbial Metabolism: Foundations and Pathways

Study Guide - Practice Questions