Question 1

Which of the following best describes the difference between kinetic and potential energy in biological systems?

Accepted Answer

Kinetic energy is the energy of motion, while potential energy is stored energy due to position or structure.

Question 2

Which of the following reactions is typically exergonic in cellular metabolism?

Accepted Answer

The hydrolysis of ATP to ADP and inorganic phosphate.

Question 3

In a chemical reaction diagram, which term refers to the minimum energy required to initiate a reaction?

Accepted Answer

Activation energy

Question 4

How does an endergonic reaction differ from an exergonic reaction?

Accepted Answer

Endergonic reactions require energy input and do not proceed spontaneously, while exergonic reactions release energy and proceed spontaneously.

Question 5

Cells perform work by using energy. Which molecule is most commonly used by cells to perform work, and what is the source of its energy?

Accepted Answer

ATP; energy is released from the hydrolysis of its terminal phosphate bond.

Question 6

During the ATP cycle, which reaction releases the most energy for cellular work?

Accepted Answer

Hydrolysis of ATP to ADP and inorganic phosphate.

Question 7

Which part of the ATP molecule is separated to release energy, and what are the products of this reaction?

Accepted Answer

The terminal phosphate group is hydrolyzed, producing ADP and inorganic phosphate ($$\mathrm{P_i}).$$

Question 8

Enzymes are highly specific for their substrates. What feature of an enzyme allows this specificity?

Accepted Answer

The enzyme's active site has a unique shape that fits only specific substrates.

Question 9

Which of the following is NOT a mechanism by which enzymes lower activation energy?

Accepted Answer

Directly adding energy to the substrate in the form of ATP hydrolysis.

Question 10

Which of the following environmental factors can affect enzyme activity in a cell?

Accepted Answer

Temperature, pH, and the presence of inhibitors or activators.

Question 11

Competitive inhibition of an enzyme can be described as:

Accepted Answer

An inhibitor binds to the active site, preventing substrate binding.

Question 12

Which equation best represents the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H_2O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 13

A patient is given a drug that acts as a non-competitive inhibitor for a key metabolic enzyme. What is the most likely effect?

Accepted Answer

The drug binds to a site other than the active site, reducing enzyme activity regardless of substrate concentration.

Question 14

Which of the following best describes allosteric activation of an enzyme?

Accepted Answer

A molecule binds to a regulatory site, stabilizing the active form of the enzyme.

Question 15

Which of the following is an example of an anabolic reaction?

Accepted Answer

The synthesis of proteins from amino acids.

Question 16

Which statement about enzyme specificity is correct?

Accepted Answer

Enzymes are specific because their active sites fit only certain substrates.

Question 17

Which of the following is a possible effect of increasing temperature on enzyme activity?

Accepted Answer

Enzyme activity increases up to an optimal temperature, then decreases due to denaturation.

Question 18

Which of the following best explains why enzymes are necessary for life?

Accepted Answer

Enzymes allow reactions to occur at rates compatible with life by lowering activation energy.

Question 19

A scientist measures the free energy change ($$\Delta G) of a $$reaction and finds it to be negative. What does this indicate about the reaction?

Accepted Answer

The reaction is exergonic and will proceed spontaneously.

Energy, Enzymes, and Metabolism: Study Notes for General Biology

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