CELLULAR ENERGETICS EXAM
Q$A
Which of the following best describes the effect AChE has on the hydrolysis of ACh? -
CORRECT ANSWER-AChE decreases activation energy of ACh hydrolysis, increasing
the rate of this reaction
Which of the following best explains why pancreatic amylase is able to break down
starches, but not lipids? - CORRECT ANSWER-Enzymes bind only to their specific
substrates.
Consider a reaction in which reactants X and Y combine to form the product Z. The
diagram below compares the reaction coordinates for the catalyzed and uncatalyzed
pathways of this reaction.
Which of the following statements about letter C is true? - CORRECT ANSWER-Letter
C represents the activation energy of the uncatalyzed reaction pathway.
Which of the following best describes the process of induced fit? - CORRECT
ANSWER-A substrate binds to the active site of an enzyme, causing the conformation
of the active site to change slightly.
Which of the following best explains why ptyalin is able to break down starches, but not
proteins? - CORRECT ANSWER-Enzymes are specific to their substrates.
Which of the following best explains how the addition of an enzyme would affect the
above reaction? - CORRECT ANSWER-The enzyme would decrease the activation
energy of the reaction, increasing its rate
Which of the following statements about letter B is true? - CORRECT ANSWER-Letter
B represents the activation energy of the catalyzed reaction pathway.
Which of the following best describes what happens when maltose binds with maltase?
- CORRECT ANSWER-Maltose binds to the active site of maltase, causing the
conformation of the active site to change slightly.
................. - CORRECT ANSWER-...............
Based on the data above, which of the following best describes what happens to the
rate of product formation at higher initial substrate concentrations? - CORRECT
ANSWER-The rate of product formation levels off because nearly all of the enzyme is
bound to substrate.
, A solution of enzyme A has a pH of 8. Based on the graph, which pH change would
result in higher enzyme activity? - CORRECT ANSWER-Decreasing the pH of the
solution to 6
Which of the following terms best describes cyanide? - CORRECT ANSWER-
Noncompetitive inhibitor
Which of the following would most likely result if pepsin's environmental temperature
was lowered from 37C to 25C - CORRECT ANSWER-Pepsin would be less efficient at
catalyzing reactions.
Based on the graph, what is the approximate optimal pH for enzyme B? - CORRECT
ANSWER-10
Based on the data above, which of the following best predicts how the rate of product
formation will change if the initial substrate concentration is increased from 0.7M to
1.0M - CORRECT ANSWER-The rate of product formation will not change significantly.
Which of the following terms best describes methotrexate? - CORRECT ANSWER-
Competitive inhibitor
Which of the following best explains why trypsin is not active at high temperatures? -
CORRECT ANSWER-At high temperatures, trypsin loses its tertiary and secondary
structures.
..................... - CORRECT ANSWER-..................
Which of the following statements describes a likely result of this clustering? -
CORRECT ANSWER-Pathway intermediates are prevented from entering alternative
metabolic pathways.
Which of the following statements best describes the process carried out by glutamine
synthetase? - CORRECT ANSWER-Glutamine synthetase uses an exothermic reaction
to drive an endothermic one by catalyzing the formation of a phosphorylated
intermediate.
Which of the following pieces of evidence best supports the claim that the wild type
version of the gene described above is not essential for ATP synthase function? -
CORRECT ANSWER-There is no lethal phenotype associated with a null mutation in
the gene.
Which of the following statements best justifies the claim that the processes carried out
by the fungus are consistent with the second law of thermodynamics? - CORRECT
ANSWER-The total amount of entropy in the universe increases when heat is released
from fungus into the environment
Q$A
Which of the following best describes the effect AChE has on the hydrolysis of ACh? -
CORRECT ANSWER-AChE decreases activation energy of ACh hydrolysis, increasing
the rate of this reaction
Which of the following best explains why pancreatic amylase is able to break down
starches, but not lipids? - CORRECT ANSWER-Enzymes bind only to their specific
substrates.
Consider a reaction in which reactants X and Y combine to form the product Z. The
diagram below compares the reaction coordinates for the catalyzed and uncatalyzed
pathways of this reaction.
Which of the following statements about letter C is true? - CORRECT ANSWER-Letter
C represents the activation energy of the uncatalyzed reaction pathway.
Which of the following best describes the process of induced fit? - CORRECT
ANSWER-A substrate binds to the active site of an enzyme, causing the conformation
of the active site to change slightly.
Which of the following best explains why ptyalin is able to break down starches, but not
proteins? - CORRECT ANSWER-Enzymes are specific to their substrates.
Which of the following best explains how the addition of an enzyme would affect the
above reaction? - CORRECT ANSWER-The enzyme would decrease the activation
energy of the reaction, increasing its rate
Which of the following statements about letter B is true? - CORRECT ANSWER-Letter
B represents the activation energy of the catalyzed reaction pathway.
Which of the following best describes what happens when maltose binds with maltase?
- CORRECT ANSWER-Maltose binds to the active site of maltase, causing the
conformation of the active site to change slightly.
................. - CORRECT ANSWER-...............
Based on the data above, which of the following best describes what happens to the
rate of product formation at higher initial substrate concentrations? - CORRECT
ANSWER-The rate of product formation levels off because nearly all of the enzyme is
bound to substrate.
, A solution of enzyme A has a pH of 8. Based on the graph, which pH change would
result in higher enzyme activity? - CORRECT ANSWER-Decreasing the pH of the
solution to 6
Which of the following terms best describes cyanide? - CORRECT ANSWER-
Noncompetitive inhibitor
Which of the following would most likely result if pepsin's environmental temperature
was lowered from 37C to 25C - CORRECT ANSWER-Pepsin would be less efficient at
catalyzing reactions.
Based on the graph, what is the approximate optimal pH for enzyme B? - CORRECT
ANSWER-10
Based on the data above, which of the following best predicts how the rate of product
formation will change if the initial substrate concentration is increased from 0.7M to
1.0M - CORRECT ANSWER-The rate of product formation will not change significantly.
Which of the following terms best describes methotrexate? - CORRECT ANSWER-
Competitive inhibitor
Which of the following best explains why trypsin is not active at high temperatures? -
CORRECT ANSWER-At high temperatures, trypsin loses its tertiary and secondary
structures.
..................... - CORRECT ANSWER-..................
Which of the following statements describes a likely result of this clustering? -
CORRECT ANSWER-Pathway intermediates are prevented from entering alternative
metabolic pathways.
Which of the following statements best describes the process carried out by glutamine
synthetase? - CORRECT ANSWER-Glutamine synthetase uses an exothermic reaction
to drive an endothermic one by catalyzing the formation of a phosphorylated
intermediate.
Which of the following pieces of evidence best supports the claim that the wild type
version of the gene described above is not essential for ATP synthase function? -
CORRECT ANSWER-There is no lethal phenotype associated with a null mutation in
the gene.
Which of the following statements best justifies the claim that the processes carried out
by the fungus are consistent with the second law of thermodynamics? - CORRECT
ANSWER-The total amount of entropy in the universe increases when heat is released
from fungus into the environment
