Q: Which of the following is the correct net equation for aerobic respiration of one molecule of glucose?

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

Question 1

Which of the following best describes the process of oxidative phosphorylation in cellular respiration?

Accepted Answer

It is the production of ATP using energy derived from the redox reactions of the electron transport chain.

Question 2

A patient is given an antibiotic that acts as a noncompetitive inhibitor of a bacterial enzyme. Which of the following best explains how this antibiotic works?

Accepted Answer

It binds to an allosteric site, changing the enzyme's shape and reducing its activity.

Question 3

During glycolysis, which molecule acts as the final electron acceptor?

Accepted Answer

NAD$$^+$$

Question 4

Which of the following statements about enzymes is FALSE?

Accepted Answer

Enzymes function best at 0$$^	ext{o}C.$$

Question 5

A microbe is growing in an environment with no oxygen but continues to produce ATP. Which metabolic process is most likely being used?

Accepted Answer

Fermentation

Question 6

Which of the following is the correct net equation for aerobic respiration of one molecule of glucose?

Accepted Answer

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

Question 7

Which of the following best explains why fermentation is necessary in some cells?

Accepted Answer

To regenerate NAD$$^+ so $$glycolysis can continue.

Question 8

Which of the following is NOT a function of proteins in cells?

Accepted Answer

Serving as genetic material

Question 9

A scientist measures the rate of an enzyme-catalyzed reaction at different substrate concentrations and finds that the rate levels off at high substrate concentrations. What is the most likely explanation?

Accepted Answer

All enzyme active sites are saturated with substrate.

Question 10

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

Accepted Answer

The ETC uses a series of redox reactions to create a proton gradient across a membrane.

Question 11

Which of the following is an example of substrate-level phosphorylation?

Accepted Answer

ATP synthesis during glycolysis

Question 12

A competitive inhibitor of an enzyme will:

Accepted Answer

Bind to the active site and prevent substrate binding.

Question 13

Which of the following is the main energy carrier molecule in cells?

Accepted Answer

ATP

Question 14

Which of the following best describes the role of NAD$$^+ in $$cellular respiration?

Accepted Answer

It acts as an electron carrier, accepting electrons during glycolysis and the Krebs cycle.

Question 15

Which of the following is a product of the Krebs cycle?

Accepted Answer

NADH

Question 16

A mutation causes an enzyme to lose its active site. What is the most likely consequence?

Accepted Answer

The enzyme will no longer bind its substrate or catalyze its reaction.

Question 17

Which of the following statements about catabolic and anabolic reactions is correct?

Accepted Answer

Catabolic reactions provide energy and building blocks for anabolic reactions.

Question 18

In the absence of oxygen, which molecule can act as a final electron acceptor in anaerobic respiration?

Accepted Answer

Nitrate ($$NO_3$$^-$$)

Question 19

Which of the following best explains why high fevers can be dangerous to humans at the molecular level?

Accepted Answer

High temperatures can denature enzymes, permanently inactivating them.

Question 20

A cell is observed to produce lactic acid and a small amount of ATP in the absence of oxygen. Which process is most likely occurring?

Accepted Answer

Fermentation

E1 - Ch 5: Microbial Metabolism: Enzymes, Energy Production, and Catabolic Pathways

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