Q: Which of the following equations correctly represents the hydrolysis of ATP?

$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$

Question 1

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP serves as the primary energy currency, capturing and releasing energy during metabolic reactions.

Question 2

During fasting, which process is responsible for maintaining blood glucose levels when liver glycogen is depleted?

Accepted Answer

Gluconeogenesis

Question 3

Which of the following is a correct sequence in the breakdown of energy-yielding nutrients to produce ATP?

Accepted Answer

Glucose → Pyruvate → Acetyl CoA → TCA Cycle → Electron Transport Chain → ATP

Question 4

Which statement best distinguishes anabolic from catabolic reactions?

Accepted Answer

Anabolic reactions build complex molecules from simpler ones and require energy input; catabolic reactions break down complex molecules and release energy.

Question 5

Which of the following nutrients can be converted into acetyl CoA and enter the TCA cycle for energy production?

Accepted Answer

Carbohydrates, fats, and proteins

Question 6

What is the main function of coenzymes in metabolic reactions?

Accepted Answer

They associate with enzymes to facilitate metabolic reactions, often carrying electrons or chemical groups.

Question 7

Which of the following equations correctly represents the hydrolysis of ATP?

Accepted Answer

$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$

Question 8

A patient is experiencing symptoms of starvation, including slowed heart rate and lowered body temperature. Which metabolic adaptation is most likely occurring?

Accepted Answer

Conservation of energy through hormonal changes and reduced energy output

Question 9

Which of the following best explains why feasting leads to fat formation regardless of the source of excess energy?

Accepted Answer

The body preferentially stores excess energy as fat, regardless of whether the excess comes from protein, carbohydrates, or fat.

Question 10

Which of the following statements about enzyme specificity is correct?

Accepted Answer

Each enzyme catalyzes the reaction of a single type of substrate molecule or a group of closely related molecules.

Question 11

During prolonged fasting, which alternative fuel is produced to supply energy to the brain?

Accepted Answer

Ketone bodies from fatty acid breakdown

Question 12

Which process is most directly responsible for the release of energy from food molecules in the cell?

Accepted Answer

Catabolic reactions

Question 13

Which of the following best describes the role of the liver in energy metabolism?

Accepted Answer

The liver is the most metabolically active organ, processing nutrients and regulating energy supply.

Question 14

Which of the following is a coupled reaction in metabolism?

Accepted Answer

Energy produced in one reaction is used to drive another reaction, such as ATP synthesis from ADP and $P_i$.

Question 15

Which equation best represents the regeneration of ATP from ADP and inorganic phosphate?

Accepted Answer

$\mathrm{ADP} + \mathrm{P}_i + 	ext{energy} ightarrow \mathrm{ATP}$

Question 16

A person consumes a meal high in carbohydrates, fats, and proteins. Which of the following correctly describes the fate of these nutrients in energy metabolism?

Accepted Answer

All are broken down to acetyl CoA, which enters the TCA cycle for ATP production.

Question 17

Which of the following is NOT a symptom of starvation?

Accepted Answer

Increased resistance to disease

Question 18

Which of the following statements about the ATP/ADP cycle is correct?

Accepted Answer

ATP is hydrolyzed to ADP and $P_i$, releasing energy; ADP and $P_i$ are then resynthesized to ATP using energy from food.

Question 19

Which of the following best explains why enzymes do not alter the free energy ($\Delta G$) of a reaction?

Accepted Answer

Enzymes only lower the activation energy, not the overall free energy change ($\Delta G$) of the reaction.

Energy and Metabolism exam 3

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