Q: Which equation best represents the overall reaction of glycolysis?

$$\text{Glucose} + 2\,\text{NAD}^+ + 2\,\text{ADP} + 2\,\text{P}_i \rightarrow 2\,\text{Pyruvate} + 2\,\text{NADH} + 2\,\text{ATP} + 2\,\text{H}_2\text{O}$$

Q: During anaerobic glycolysis, which step allows glycolysis to continue by recycling NAD$$^+$$?

$$\text{Pyruvate} + \text{NADH} \rightarrow \text{Lactate} + \text{NAD}^+$$

Question 1

Which cellular compartment is the site of glycolysis?

Accepted Answer

Cytoplasm

Question 2

During glycolysis, which molecule is directly produced and can enter either aerobic or anaerobic pathways?

Accepted Answer

Pyruvate

Question 3

What is the net ATP yield from one molecule of glucose during glycolysis?

Accepted Answer

$$2$$

Question 4

The fate of pyruvate after glycolysis depends on the presence of which molecule?

Accepted Answer

Oxygen ($$O_2)$$

Question 5

In anaerobic conditions, what is the end product of glycolysis in human muscle cells?

Accepted Answer

Lactic acid (lactate)

Question 6

After lactic acid is produced in muscle cells, where is it primarily transported for further metabolism?

Accepted Answer

Liver

Question 7

What process occurs to lactic acid in the liver?

Accepted Answer

It is converted back to glucose via gluconeogenesis

Question 8

Which of the following is NOT a reason why anaerobic fermentation is less favored by the body?

Accepted Answer

It requires more oxygen than aerobic respiration

Question 9

A sprinter experiences muscle fatigue during a race. Which metabolic pathway is primarily responsible for this phenomenon?

Accepted Answer

Anaerobic glycolysis leading to lactic acid production

Question 10

Which coenzyme is regenerated during the conversion of pyruvate to lactate, allowing glycolysis to continue under anaerobic conditions?

Accepted Answer

NAD$$^+$$

Question 11

If a patient has a deficiency in the enzyme lactate dehydrogenase, what would be the most likely consequence during intense exercise?

Accepted Answer

Impaired regeneration of NAD$$^+$$, leading to decreased glycolytic flux

Question 12

Which equation best represents the overall reaction of glycolysis?

Accepted Answer

$$	ext{Glucose} + 2\,	ext{NAD}^+ + 2\,	ext{ADP} + 2\,	ext{P}_i ightarrow 2\,	ext{Pyruvate} + 2\,	ext{NADH} + 2\,	ext{ATP} + 2\,	ext{H}_2	ext{O}$$

Question 13

During anaerobic glycolysis, which step allows glycolysis to continue by recycling NAD$$^+$$?

Accepted Answer

$$	ext{Pyruvate} + 	ext{NADH} ightarrow 	ext{Lactate} + 	ext{NAD}^+$$

Question 14

Which of the following best explains why lactic acid accumulation can lead to muscle fatigue?

Accepted Answer

Lactic acid lowers intracellular pH, impairing enzyme activity

Question 15

A patient with impaired liver function is likely to have difficulty with which aspect of lactic acid metabolism?

Accepted Answer

Converting lactic acid back to glucose via gluconeogenesis

Question 16

Which of the following is a physiological sign of increased lactic acid production during exercise?

Accepted Answer

Muscle soreness and burning sensation

Question 17

Why is anaerobic glycolysis less efficient than aerobic respiration?

Accepted Answer

It produces only $$2$$ ATP per glucose compared to up to $$36$$ ATP in aerobic respiration

Question 18

Which of the following is a multi-step process that occurs after intense exercise to restore blood glucose levels?

Accepted Answer

Cori cycle: lactate produced in muscles is transported to the liver and converted to glucose

Question 19

Which of the following statements about glycolysis is TRUE?

Accepted Answer

Glycolysis can occur in the absence of oxygen

Step-by-Step Guidance: Glycolysis and the Lactic Acid Pathway

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