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

Question 1

Which of the following statements best describes the relationship between catabolic and anabolic reactions in cellular metabolism?

Accepted Answer

The energy released from catabolic reactions is used to drive anabolic reactions.

Question 2

Which of the following is TRUE regarding enzyme function?

Accepted Answer

Enzymes lower the activation energy, allowing reactions to proceed at lower temperatures.

Question 3

A scientist is studying an enzyme that requires magnesium ions to function. What is the role of magnesium in this context?

Accepted Answer

Magnesium is a cofactor, assisting the enzyme's catalytic activity.

Question 4

Which of the following best explains why enzymatic activity decreases at very high temperatures?

Accepted Answer

High temperatures cause denaturation, altering the enzyme's three-dimensional structure.

Question 5

A metabolic pathway is regulated by feedback inhibition. Which of the following best describes this process?

Accepted Answer

The end-product of the pathway inhibits an enzyme near the start of the pathway.

Question 6

During glycolysis, how many ATP and NADH molecules are produced from one molecule of glucose?

Accepted Answer

Two ATP and two NADH

Question 7

Which equation correctly represents the substrate-level phosphorylation of ADP?

Accepted Answer

$$ \mathrm{ADP} + \mathrm{P_i} \rightarrow \mathrm{ATP} $$

Question 8

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

Accepted Answer

$$ \mathrm{O_2$} $$

Question 9

A bacterium is found to produce lactic acid from glucose in the absence of oxygen. Which metabolic pathway is most likely being used?

Accepted Answer

Lactic acid fermentation

Question 10

Which of the following statements about the electron transport chain is correct?

Accepted Answer

It uses flavoproteins, cytochromes, and ubiquinones as electron carriers.

Question 11

Which of the following is a distinguishing feature of photophosphorylation in photosynthesis?

Accepted Answer

ATP is produced as electrons pass through an electron transport chain powered by light energy.

Question 12

Which pathway is used by heterolactic fermenters to produce both lactic acid and ethanol?

Accepted Answer

Pentose phosphate pathway

Question 13

Which of the following equations represents the oxidation of glucose during cellular respiration?

Accepted Answer

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

Question 14

A cell is using $$ \mathrm{NO_3$^-}  as $$its final electron acceptor. Which type of respiration is occurring?

Accepted Answer

Anaerobic respiration

Question 15

Which of the following statements about amphibolic pathways is correct?

Accepted Answer

They integrate anabolic and catabolic reactions through common intermediates.

Question 16

Which of the following is a correct description of the Calvin-Benson cycle?

Accepted Answer

It uses CO2 to synthesize sugars in the light-independent reactions of photosynthesis.

Question 17

Which of the following is TRUE about the biosynthesis of peptidoglycan in bacteria?

Accepted Answer

UDPNAc is the starting material for peptidoglycan biosynthesis.

Question 18

Which of the following best describes the role of NAD+ in cellular metabolism?

Accepted Answer

NAD+ is reduced to NADH, carrying electrons to the electron transport chain.

Question 19

A patient is diagnosed with a disorder affecting beta-oxidation. Which metabolic process is most likely impaired?

Accepted Answer

The breakdown of fatty acids into acetyl CoA.

Microbial Metabolism: Catabolism, Anabolism, and Energy Pathways

Study Guide - Practice Questions