Q: Which of the following is the correct balanced equation for aerobic respiration in prokaryotes?

$$\text{Glucose} + 6\text{O}_2 + 38\text{ADP} + 38\text{P}_i \rightarrow 38\text{ATP} + 6\text{H}_2\text{O} + 6\text{CO}_2$$

Question 1

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

Accepted Answer

NAD+ acts as an electron carrier, accepting electrons during redox reactions and becoming reduced to NADH.

Question 2

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

Accepted Answer

$$2$$

Question 3

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD+ by transferring electrons from NADH to pyruvate or its derivatives.

Question 4

Which enzyme would most likely be inhibited by a competitive inhibitor that mimics the structure of glucose?

Accepted Answer

Hexokinase

Question 5

What is the main difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP from a phosphorylated substrate, while oxidative phosphorylation uses a proton gradient and ATP synthase.

Question 6

Which of the following is the correct balanced equation for aerobic respiration in prokaryotes?

Accepted Answer

$$	ext{Glucose} + 6	ext{O}_2 + 38	ext{ADP} + 38	ext{P}_i ightarrow 38	ext{ATP} + 6	ext{H}_2	ext{O} + 6	ext{CO}_2$$

Question 7

A bacterial cell is found to use nitrate (NO$$_3^-) as $$its final electron acceptor during respiration. Which type of respiration is this?

Accepted Answer

Anaerobic respiration

Question 8

Which of the following would most likely cause an enzyme to become denatured and lose its function?

Accepted Answer

Exposure to extreme heat or very acidic pH

Question 9

In the electron transport chain, what is the primary function of the protein complexes embedded in the membrane?

Accepted Answer

To transfer electrons and pump protons across the membrane, creating a proton gradient

Question 10

Which of the following best explains why feedback inhibition is beneficial to a cell?

Accepted Answer

It prevents the overproduction of end products by inhibiting an early enzyme in a metabolic pathway when the end product accumulates.

Question 11

A mutation causes a bacterium to lack the enzyme deaminase. Which nutrient's metabolism would be most directly affected?

Accepted Answer

Proteins (amino acids)

Question 12

Which of the following is a correct description of the role of FAD in cellular respiration?

Accepted Answer

FAD is reduced to FADH$$_2$$ during the Krebs cycle and donates electrons to the electron transport chain.

Question 13

Which of the following best describes the process of beta-oxidation?

Accepted Answer

The breakdown of fatty acids into two-carbon fragments that enter the Krebs cycle as acetyl-CoA.

Question 14

A cell is exposed to a non-competitive inhibitor. What is the most likely effect on the enzyme's activity?

Accepted Answer

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

Question 15

Which of the following is a correct statement about the energy yield of aerobic versus anaerobic respiration?

Accepted Answer

Aerobic respiration yields more ATP per glucose molecule than anaerobic respiration.

Question 16

Which of the following is the correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis → Pre-Krebs (pyruvate oxidation) → Krebs cycle → Electron transport chain

Question 17

Which of the following is a waste product of lactic acid fermentation?

Accepted Answer

Lactic acid ($$	ext{C}_3	ext{H}_6	ext{O}_3)$$

Question 18

A patient presents with muscle fatigue after intense exercise. Which metabolic pathway is most likely responsible for the accumulation of lactic acid in their muscles?

Accepted Answer

Lactic acid fermentation

Question 19

Which of the following best explains why the structure of an enzyme is critical to its function?

Accepted Answer

The enzyme's three-dimensional structure determines the shape of its active site, which is specific for its substrate.

Question 20

Which of the following is a correct example of end product inhibition?

Accepted Answer

Accumulation of isoleucine inhibits the first enzyme in its biosynthetic pathway.

Microbial Metabolism and Cellular Respiration

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