BIOL 1001 EXAM 2 2026 FINAL PAPER SOLVED
QUESTIONS ANSWER KEY APLUS
◉ The most common energy carrier molecule in living organisms is
(A) ATP.
(B) ADP.
(C) DNA.
(D) glucose.
(E) NADPH..
Answer: (A) ATP
◉ The reactant in an enzyme-catalyzed reaction is the
(A) substrate.
(B) active site.
(C) product.
(D) allosteric inhibitor.
(E) activation energy..
Answer: (A) substrate
◉ In exergonic chemical reactions,
(A) energy is stored by the reactions.
,(B) the reactants have more energy than do the products.
(C) the reactants have less energy than do the products.
(D) the reactants and products have equal amounts of energy..
Answer: (B) the reactants have more energy than do the products
◉ For many enzymes, the rate of product formation increases as the
concentration of the
substrate increases. Eventually the rate of the reaction reaches a
maximum at which further increases in the
concentration of the substrate have no effect. Why?
(A) At high concentrations of substrate, all of the enzyme active sites
are being occupied by substrate molecules.
(B) At high concentrations of substrate, the activation energy of the
reaction increases.
(C) At high concentrations of substrate, the activation energy of the
reaction decreases.
(D) The enzyme is no longer specific for the substrate.
(E) At high concentrations of substrate, the reaction is endergonic.
Answer: (A) At high concentrations of substrate, all of the enzyme
active sites are being occupied by substrate molecules
◉ Activation energy is necessary for all ________ reactions.
(A) exergonic
,(B) endergonic
(C) coupled
(D) chemical.
Answer: (D) chemical
◉ Imagine that you are conducting an experiment on a yeast enzyme
known as sucrase. This enzyme is used by yeast cells to break down
the disaccharide sucrose into the monosaccharides glucose and
fructose. What type of reaction is this?
(A) Metergonic
(B) Exergonic
(C) Endergonic
(D) Spontaneous.
Answer: (B) Exergonic
(energy is released)
◉ Energy that is not converted to useful energy is usually given off
as
(A) radioactivity.
(B) electricity.
(C) light.
(D) heat.
, (E) entropy.
Answer: (D) heat
◉ Competitive and noncompetitive enzyme inhibitors differ with
respect to
(A) the precise location on the enzyme to which they bind.
(B) their pH.
(C) the temperature at which they work best.
(D) their energies of activation..
Answer: (A) the precise location on the enzyme to which they bind
◉ Human enzymes function best within a narrow range of what 2
things?.
Answer: pH, temperature
◉ For most human enzymes, maximum activity occurs at what
temperature?.
Answer: 98 degrees
◉ For most cellular enzymes, maximum activity occurs at what pH?.
Answer: 7.4
QUESTIONS ANSWER KEY APLUS
◉ The most common energy carrier molecule in living organisms is
(A) ATP.
(B) ADP.
(C) DNA.
(D) glucose.
(E) NADPH..
Answer: (A) ATP
◉ The reactant in an enzyme-catalyzed reaction is the
(A) substrate.
(B) active site.
(C) product.
(D) allosteric inhibitor.
(E) activation energy..
Answer: (A) substrate
◉ In exergonic chemical reactions,
(A) energy is stored by the reactions.
,(B) the reactants have more energy than do the products.
(C) the reactants have less energy than do the products.
(D) the reactants and products have equal amounts of energy..
Answer: (B) the reactants have more energy than do the products
◉ For many enzymes, the rate of product formation increases as the
concentration of the
substrate increases. Eventually the rate of the reaction reaches a
maximum at which further increases in the
concentration of the substrate have no effect. Why?
(A) At high concentrations of substrate, all of the enzyme active sites
are being occupied by substrate molecules.
(B) At high concentrations of substrate, the activation energy of the
reaction increases.
(C) At high concentrations of substrate, the activation energy of the
reaction decreases.
(D) The enzyme is no longer specific for the substrate.
(E) At high concentrations of substrate, the reaction is endergonic.
Answer: (A) At high concentrations of substrate, all of the enzyme
active sites are being occupied by substrate molecules
◉ Activation energy is necessary for all ________ reactions.
(A) exergonic
,(B) endergonic
(C) coupled
(D) chemical.
Answer: (D) chemical
◉ Imagine that you are conducting an experiment on a yeast enzyme
known as sucrase. This enzyme is used by yeast cells to break down
the disaccharide sucrose into the monosaccharides glucose and
fructose. What type of reaction is this?
(A) Metergonic
(B) Exergonic
(C) Endergonic
(D) Spontaneous.
Answer: (B) Exergonic
(energy is released)
◉ Energy that is not converted to useful energy is usually given off
as
(A) radioactivity.
(B) electricity.
(C) light.
(D) heat.
, (E) entropy.
Answer: (D) heat
◉ Competitive and noncompetitive enzyme inhibitors differ with
respect to
(A) the precise location on the enzyme to which they bind.
(B) their pH.
(C) the temperature at which they work best.
(D) their energies of activation..
Answer: (A) the precise location on the enzyme to which they bind
◉ Human enzymes function best within a narrow range of what 2
things?.
Answer: pH, temperature
◉ For most human enzymes, maximum activity occurs at what
temperature?.
Answer: 98 degrees
◉ For most cellular enzymes, maximum activity occurs at what pH?.
Answer: 7.4
