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

Question 1

Which of the following best describes a catabolic pathway in microbial metabolism?

Accepted Answer

A sequence of reactions that breaks down complex molecules to release energy and provide building blocks

Question 2

During cellular respiration, what is the balanced chemical equation for the complete oxidation of glucose?

Accepted Answer

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

Question 3

Which process directly generates ATP by transferring a phosphate group from a high-energy substrate to ADP?

Accepted Answer

Substrate-level phosphorylation

Question 4

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

Accepted Answer

2 ATP

Question 5

Which of the following statements about oxidation-reduction reactions in biological systems is correct?

Accepted Answer

Oxidation is often associated with the loss of hydrogen atoms (dehydrogenation)

Question 6

What is the primary role of the electron transport chain in aerobic respiration?

Accepted Answer

To transfer electrons and use the released energy to generate ATP via oxidative phosphorylation

Question 7

Which stage of glycolysis is responsible for the production of NADH and ATP?

Accepted Answer

Energy-conserving stage

Question 8

A bacterium is able to break down extracellular proteins for energy. Which type of enzyme is most likely involved in this process?

Accepted Answer

Exoenzyme

Question 9

Which of the following best explains why stepwise extraction of energy from glucose is advantageous for cells?

Accepted Answer

It enables controlled release and capture of energy in the form of ATP

Question 10

During substrate-level phosphorylation, which equation best represents the process?

Accepted Answer

$$\mathrm{C{-}C{-}C} \sim \mathrm{P} + \mathrm{ADP} \rightarrow \mathrm{C{-}C{-}C} + \mathrm{ATP}$$

Question 11

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

Accepted Answer

Synthesizing large molecules from small precursors

Question 12

Which process in microbial metabolism is most directly responsible for the production of the majority of ATP during aerobic respiration?

Accepted Answer

Electron transport chain (oxidative phosphorylation)

Question 13

Which of the following is a correct description of the preparatory stage of glycolysis?

Accepted Answer

Glucose is split to form two molecules of glyceraldehyde-3-phosphate, using 2 ATP

Question 14

Which of the following statements about the generation of ATP is correct?

Accepted Answer

ATP is generated from ADP and energy in an endergonic reaction

Question 15

Which of the following is a real-world example of oxidative phosphorylation?

Accepted Answer

ATP synthesis in mitochondria using the electron transport chain

Question 16

In the context of microbial metabolism, which process is most likely to occur in the absence of oxygen?

Accepted Answer

Anaerobic respiration

Question 17

Which of the following is a key difference between anabolic and catabolic pathways?

Accepted Answer

Anabolic pathways use energy to build large molecules, while catabolic pathways release energy by breaking down molecules

Question 18

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

Accepted Answer

NADH donates electrons to the electron transport chain, facilitating ATP production

Question 19

A patient’s cells are unable to efficiently transport nutrients across the cell membrane. Which cellular structure is most likely malfunctioning?

Accepted Answer

Cell membrane transporters

Microbial Metabolism: Pathways, Energy Production, and Carbohydrate Catabolism

Study Guide - Practice Questions