Q: Which equation represents the overall reaction for aerobic cellular respiration?

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

Question 1

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

Accepted Answer

Catabolism breaks down molecules to release energy, which is then used by anabolism to build macromolecules.

Question 2

In the ATP-ADP cycle, which equation represents the phosphorylation of ADP to ATP?

Accepted Answer

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

Question 3

Which statement about oxidation-reduction (redox) reactions is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 4

Which coenzyme is derived from niacin (B3) and acts as an electron carrier in cellular respiration?

Accepted Answer

Nicotinamide adenine dinucleotide (NAD+)

Question 5

What is the effect of an enzyme on the activation energy of a chemical reaction?

Accepted Answer

Enzymes lower the activation energy required.

Question 6

Which of the following is true regarding the lock-and-key model of enzyme activity?

Accepted Answer

Substrates fit specifically into the enzyme's active site, forming an enzyme-substrate complex.

Question 7

Which factor does NOT directly affect the rate of enzymatic reactions?

Accepted Answer

Color of the enzyme

Question 8

What happens to a protein enzyme when it is denatured?

Accepted Answer

It loses its functional shape and cannot catalyze reactions.

Question 9

Which of the following best describes competitive inhibition?

Accepted Answer

An inhibitor binds to the active site, preventing substrate binding.

Question 10

Which process provides cells with an alternative source of NAD+ when oxygen is not available?

Accepted Answer

Fermentation

Question 11

Which equation represents the overall reaction for aerobic cellular respiration?

Accepted Answer

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

Question 12

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

Accepted Answer

2 ATP, 2 NADH

Question 13

Which molecule is produced when pyruvic acid is converted before entering the Krebs cycle?

Accepted Answer

Acetyl-CoA

Question 14

Where does the electron transport chain occur in prokaryotic cells?

Accepted Answer

Cytoplasmic membrane

Question 15

Which of the following is the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 16

Which process results in the most significant production of ATP during cellular respiration?

Accepted Answer

Electron transport chain / chemiosmosis

Question 17

Which of the following is a product of fermentation by Saccharomyces species?

Accepted Answer

Ethanol

Question 18

Which enzyme class catalyzes the transfer of electrons or hydrogen atoms from one molecule to another?

Accepted Answer

Oxidoreductase

Question 19

A patient with gangrene caused by Clostridium perfringens is experiencing tissue destruction. Which metabolic pathway is primarily responsible for this effect?

Accepted Answer

Fermentation

Question 20

Which of the following best explains feedback inhibition in metabolic pathways?

Accepted Answer

The end product binds to an allosteric site, shutting down the pathway.

Chp 5 Microbial Metabolism: Foundations and Pathways

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