$$\text{Amino Acid} \rightarrow \text{Keto Acid} + \text{NH}_3$$

Question 1

Which of the following best describes the difference between catabolic and anabolic processes with respect to energy within cells?

Accepted Answer

Catabolic processes are exergonic and release energy, while anabolic processes are endergonic and require energy input.

Question 2

During nutrient catabolism, which molecule acts as the most common electron carrier?

Accepted Answer

Nicotinamide adenine dinucleotide (NAD)

Question 3

Which equation correctly represents the net ATP yield from glycolysis per molecule of glucose?

Accepted Answer

$$	ext{Net ATP} = 4 - 2 = 2$$

Question 4

Which of the following best explains why redox reactions are always coupled?

Accepted Answer

Because a molecule cannot undergo reduction without another molecule simultaneously undergoing oxidation.

Question 5

Which process is responsible for the direct addition of a phosphate group to ADP during glycolysis?

Accepted Answer

Substrate-level phosphorylation

Question 6

An enzyme catalyzes a reaction by:

Accepted Answer

Decreasing the activation energy required for the reaction.

Question 7

Which of the following statements about competitive inhibition is correct?

Accepted Answer

Competitive inhibitors bind to the active site and can be displaced by increasing substrate concentration.

Question 8

Which pathway is used by organisms that lack an electron transport system and uses organic compounds as the final electron acceptor?

Accepted Answer

Fermentation

Question 9

In eukaryotic cells, where does pyruvate oxidation occur?

Accepted Answer

In the mitochondria

Question 10

Which equation represents the total number of NADH molecules produced from one glucose molecule during the Krebs cycle?

Accepted Answer

$$6 	ext{ NADH}$$

Question 11

What is the primary purpose of fermentation in cells?

Accepted Answer

To regenerate oxidized NAD so glycolysis can continue

Question 12

Which fermentation pathway produces CO2 as a natural by-product?

Accepted Answer

Alcohol fermentation

Question 13

What is the fate of fatty acids after triglycerides are broken down by lipases?

Accepted Answer

They undergo beta oxidation to form acetyl CoA.

Question 14

Which equation represents the removal of the amino group from an amino acid during deamination?

Accepted Answer

$$	ext{Amino Acid} ightarrow 	ext{Keto Acid} + 	ext{NH}_3$$

Question 15

Which process is responsible for synthesizing glucose from pyruvate?

Accepted Answer

Gluconeogenesis

Question 16

During oxidative phosphorylation, what is the role of ATP synthase?

Accepted Answer

It allows protons to flow back across the membrane, harnessing their energy to synthesize ATP from ADP and phosphate.

Question 17

Which of the following is a correct description of the light-dependent reactions of photosynthesis?

Accepted Answer

They are catabolic reactions that break down water and release oxygen.

Question 18

Which of the following best describes the function of exoenzymes?

Accepted Answer

They function outside the cell to break down large molecules for absorption.

Question 19

A regulated enzyme is produced:

Accepted Answer

Only in response to the substrate's presence and repressed when the end product is abundant.

Question 20

Which of the following is a consequence of protein catabolism via deamination?

Accepted Answer

Production of ammonia ($$	ext{NH}_3) as a $$waste product

Microbiology Metabolism and Energy Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions