BIO 1404 TEST 3 : UNIVERSITY OF TEXAS
1. A (An) ______ begins with a particular reactant, terminates with an end
product, and has many minute steps in
between.
A) thermodynamic law
B) metabolic pathway
C) synthetic reaction
D) hydrolytic reaction
E) energy of activation
2. Which of the following statements is NOT correct about enzymes?
A) Enzymes allow reactions to occur by stretching bonds in reactants.
B) Enzymes bind with their substrates with great specificity
C) Enzymes raise the energy of activation for a reaction.
D) Enzymes bring together particular molecules and cause them to react with
one another.
E) Enzymes can be used over and over again.
3. Which of the following cell organelles convert one form of energy into
another?
A) ribosomes
B) Golgi apparatus
C) chloroplast
D) lysosome
E) endoplasmic reticulum
4. Which of the following statements is NOT correct?
A) Carbon dioxide given off by mitochondria is used by chloroplasts.
B) Carbohydrates produced by chloroplasts may be used by mitochondria.
C) Oxygen released by chloroplasts may be used by mitochondria.
D) Carbon dioxide given off by chloroplasts may be used by mitochondria.
E) Heat is released by reactions occurring in the chloroplast and mitochondria.
5. Which of the following comparisons is NOT correct?
A) metabolism—sum of all chemical reactions occurring inside a living cell
B) ATP—energy currency
C) energy—constantly cycled back and forth through living things
D) ATP__ resembles an amino acid
E) enzyme—organic catalyst that speeds up a chemical reaction
, 6. Hydrolysis of ATP releases energy, which results in the production of ADP
and inorganic phosphate. What is
commonly the ultimate fate of inorganic phosphate produced in the cytosol?
A) It is secreted as waste.
B) It is combined with ADP to regenerate ATP.
C) It is phosphorylated.
D) It is hydrolyzed to release additional energy.
7. The ∆G for a particular enzyme-catalyzed reaction is -20
kcal/mol. If the amount of enzyme in the reaction is
doubled, what will be the ∆G for the new reaction?
A) -40 kcal/mol
B) -20 kcal/mol
C) 0 kcal/mol
D) +20 kcal/mol
E) +40 kcal/mol
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8. The active site of an enzyme is the region that
A) binds coenzymes for the enzyme
B) binds substrates for the enzyme.
C) binds competitive inhibitors of the enzyme.
D) A and B
E) all of these
9. Statins are drugs used to lower blood cholesterol. They act by inhibiting a
key enzyme involved in cholesterol
biosynthesis.
Statins are similar in shape to one of the enzyme's normal substrates When
Statins bind to the active site of the
enzyme they prevent the real substrate from binding.
Based on this description, statins act as:
A) Non-competitive inhibitors
B) Competitive inhibitors
C) Coenzymes
D) Cofactors
10. In the question above the binding of the statins
1. A (An) ______ begins with a particular reactant, terminates with an end
product, and has many minute steps in
between.
A) thermodynamic law
B) metabolic pathway
C) synthetic reaction
D) hydrolytic reaction
E) energy of activation
2. Which of the following statements is NOT correct about enzymes?
A) Enzymes allow reactions to occur by stretching bonds in reactants.
B) Enzymes bind with their substrates with great specificity
C) Enzymes raise the energy of activation for a reaction.
D) Enzymes bring together particular molecules and cause them to react with
one another.
E) Enzymes can be used over and over again.
3. Which of the following cell organelles convert one form of energy into
another?
A) ribosomes
B) Golgi apparatus
C) chloroplast
D) lysosome
E) endoplasmic reticulum
4. Which of the following statements is NOT correct?
A) Carbon dioxide given off by mitochondria is used by chloroplasts.
B) Carbohydrates produced by chloroplasts may be used by mitochondria.
C) Oxygen released by chloroplasts may be used by mitochondria.
D) Carbon dioxide given off by chloroplasts may be used by mitochondria.
E) Heat is released by reactions occurring in the chloroplast and mitochondria.
5. Which of the following comparisons is NOT correct?
A) metabolism—sum of all chemical reactions occurring inside a living cell
B) ATP—energy currency
C) energy—constantly cycled back and forth through living things
D) ATP__ resembles an amino acid
E) enzyme—organic catalyst that speeds up a chemical reaction
, 6. Hydrolysis of ATP releases energy, which results in the production of ADP
and inorganic phosphate. What is
commonly the ultimate fate of inorganic phosphate produced in the cytosol?
A) It is secreted as waste.
B) It is combined with ADP to regenerate ATP.
C) It is phosphorylated.
D) It is hydrolyzed to release additional energy.
7. The ∆G for a particular enzyme-catalyzed reaction is -20
kcal/mol. If the amount of enzyme in the reaction is
doubled, what will be the ∆G for the new reaction?
A) -40 kcal/mol
B) -20 kcal/mol
C) 0 kcal/mol
D) +20 kcal/mol
E) +40 kcal/mol
https://www.coursehero.com/file/25815079/Test-3-Form-A-
Answerspdf/
This study resource was
shared via CourseHero.com
2|Page
8. The active site of an enzyme is the region that
A) binds coenzymes for the enzyme
B) binds substrates for the enzyme.
C) binds competitive inhibitors of the enzyme.
D) A and B
E) all of these
9. Statins are drugs used to lower blood cholesterol. They act by inhibiting a
key enzyme involved in cholesterol
biosynthesis.
Statins are similar in shape to one of the enzyme's normal substrates When
Statins bind to the active site of the
enzyme they prevent the real substrate from binding.
Based on this description, statins act as:
A) Non-competitive inhibitors
B) Competitive inhibitors
C) Coenzymes
D) Cofactors
10. In the question above the binding of the statins
