Q: Which of the following is the correct equation for the oxidation of glucose during cellular respiration?

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

Question 1

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

Accepted Answer

Catabolism breaks down nutrients to produce ATP, which is then used by anabolism to build larger molecules.

Question 2

Which of the following is the correct equation for the oxidation of glucose during cellular respiration?

Accepted Answer

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

Question 3

Which statement best explains the role of NAD+ and FAD in metabolism?

Accepted Answer

They are electron carriers that transfer energy from food to ATP by transporting electrons to the electron transport chain.

Question 4

A scientist is studying a metabolic pathway and observes that the addition of a certain molecule causes the pathway to slow down. This molecule binds to a site other than the active site of the enzyme. What type of inhibition is this, and what is the likely effect on enzyme activity?

Accepted Answer

Noncompetitive inhibition; the inhibitor decreases the enzyme's activity by altering its shape.

Question 5

Which of the following best describes the function of enzymes in metabolic reactions?

Accepted Answer

Enzymes act as biological catalysts that speed up reactions and reduce the required activation energy.

Question 6

Which of the following is a correct comparison between the pentose phosphate pathway and the Entner-Doudoroff pathway?

Accepted Answer

The pentose phosphate pathway produces NADPH and ribose-5-phosphate, while the Entner-Doudoroff pathway produces NADPH, 1 ATP, 1 NADH, and 2 pyruvate.

Question 7

During glycolysis, what are the net products generated from one molecule of glucose?

Accepted Answer

2 pyruvate, 2 NADH, and 2 ATP

Question 8

Which of the following best explains why oxygen is required for aerobic respiration?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, allowing for the production of water and ATP.

Question 9

A patient’s cells are exposed to high temperatures, causing the enzymes to denature. What is the most likely consequence for the cell’s metabolism?

Accepted Answer

The cell’s metabolic reactions will slow down or stop because the enzymes lose their functional shape.

Question 10

Which of the following is a product of fermentation in certain bacteria and is commonly found in foods such as cheese and kimchi?

Accepted Answer

Lactic acid

Question 11

Which of the following best differentiates cellular respiration from fermentation?

Accepted Answer

Cellular respiration uses oxygen and produces more ATP than fermentation.

Question 12

Which of the following molecules can serve as final electron acceptors in anaerobic respiration?

Accepted Answer

Nitrate ($$NO_3$$^-$$), sulfate (SO_4$^{2-}$$), or carbon dioxide ($$CO_2)$$

Question 13

Which of the following best describes the process of feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway inhibits an enzyme involved early in the pathway, preventing overproduction.

Question 14

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 15

During the metabolism of pyruvic acid in the absence of oxygen, which of the following occurs?

Accepted Answer

NADH is oxidized to NAD+ so glycolysis can continue.

Question 16

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that only fits specific substrate molecules.

Question 17

Which of the following is a correct summary of the main steps in aerobic cellular respiration?

Accepted Answer

Glycolysis, Krebs cycle, electron transport chain

Question 18

A mutation causes an enzyme in the glycolytic pathway to lose its function. What is the most likely effect on the cell?

Accepted Answer

The cell will be unable to produce pyruvate and will have reduced ATP production.

Question 19

Which of the following best describes the role of acetyl-CoA in cellular respiration?

Accepted Answer

Acetyl-CoA enters the Krebs cycle, where it is oxidized to produce NADH, $$FADH_2$$, and ATP.

Question 20

Which of the following is a real-world example of a microorganism using anaerobic respiration?

Accepted Answer

A bacterium reducing nitrate ($$NO_3$$^-$$) to nitrogen gas (N_2$) in soil.

Microbial Metabolism and Enzyme Function: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards