Question 1

Which statement best describes the First Law of Thermodynamics as it applies to biological systems?

Accepted Answer

Energy can be transformed from one form to another, but the total energy remains constant.

Question 2

During cellular respiration, which balanced chemical equation correctly represents the process?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + \mathrm{ATP}$$

Question 3

Which of the following is TRUE about ATP (Adenosine Triphosphate)?

Accepted Answer

ATP is a nucleotide that contains adenine, ribose, and three phosphate groups.

Question 4

What is the main difference between exergonic and endergonic reactions?

Accepted Answer

Exergonic reactions release energy, while endergonic reactions require energy input.

Question 5

Which statement about enzyme-substrate interactions according to the induced-fit theory is correct?

Accepted Answer

The enzyme's active site changes shape to better fit the substrate, but does not form a chemical bond.

Question 6

Which of the following best explains why enzymes are considered biological catalysts?

Accepted Answer

They speed up chemical reactions without being consumed in the process.

Question 7

A scientist increases the substrate concentration in an enzyme-catalyzed reaction. What is the expected effect on the rate of reaction?

Accepted Answer

The rate of reaction will increase and then level off as the enzyme becomes saturated.

Question 8

Which of the following is a function of NAD (Nicotinamide Adenine Dinucleotide) in cellular respiration?

Accepted Answer

NAD acts as a coenzyme that carries two electrons from one reaction site to another.

Question 9

Which of the following conditions would most likely cause an enzyme to denature?

Accepted Answer

A temperature above the enzyme's optimal range.

Question 10

What is the role of cofactors in enzyme activity?

Accepted Answer

Cofactors bind to the enzyme and participate in the reaction by removing electrons, protons, or chemical groups from the substrate.

Question 11

Which of the following best describes competitive inhibition?

Accepted Answer

A molecule similar to the substrate competes for the enzyme's active site.

Question 12

Which process occurs in the chloroplast and is represented by the following equation?
$$6\mathrm{CO_2$} + 6\mathrm{H_2O} \rightarrow \mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$}$$

Accepted Answer

Photosynthesis

Question 13

Which statement about activation energy and enzymes is correct?

Accepted Answer

Enzymes lower the activation energy, making reactions occur more easily.

Question 14

A student adds more enzyme to a reaction mixture. What is the expected effect on the rate of reaction?

Accepted Answer

The rate of reaction will increase and then level off as substrate becomes limiting.

Question 15

Which of the following is TRUE about the hydrolysis of ATP?

Accepted Answer

Hydrolysis of ATP results in the removal of a phosphate group and the release of energy.

Question 16

Which of the following best describes the effect of pH on enzyme activity?

Accepted Answer

Each enzyme has an optimal pH range where its activity is highest.

Question 17

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

Accepted Answer

The synthesis of proteins from amino acids.

Question 18

Which statement about enzyme reuse is correct?

Accepted Answer

Enzymes can be reused after the reaction because they are not changed by the process.

Question 19

Which of the following ions can act as a cofactor for enzymes?

Accepted Answer

Magnesium ($$\mathrm{Mg$$^{2+}$$})$$

Question 20

Which of the following statements about incompetitive inhibition is correct?

Accepted Answer

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

Energy and Enzymes: Principles and Cellular Applications

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