AP BIOLOGY - ENZYMES AND
CELLULAR RESPIRATION PRACTICE
REVIEW TEST QUESTIONS AND
ANSWERS
What is activation energy? How do enzymes affect it? - ANSWER-Activation energy
is the energy needed for a chemical reaction to start. Enzymes affect it by acting as
catalysts. Catalysts are substances that speed up reactions by lowering the
activation energy without altering reaction
What is the enzyme-substrate complex? - ANSWER-Enzyme-substrate complex is
when enzymes provide a site where reactants can be brought together and react
How does the induced-fit explanation for enzymes alter the old lock & key thought of
enzymes? - ANSWER-Induced-fit is an enzyme having to change its shape slightly
to fit its substrate. Lock & key means that the enzyme is perfect for their substrate
What are some coenzymes that our bodies rely on? How do they work? - ANSWER-
Our bodies rely on NAD and FAD. Coenzymes help enzymes catalyze reactions
What can alter enzyme activity? - ANSWER-Change in temperature, change in pH,
amount of substrate
Explain how competitive inhibition and noncompetitive inhibition work. - ANSWER-
Competitive inhibition happens when different molecules, similar in shape to the
substrate, compete for the active site of the enzyme. Noncompetitive enzyme
inhibition happens when allosteric regulators bind to a site causing a change in the
enzyme shape inhibiting the enzyme to catalyze substrates
Explain feedback inhibition - ANSWER-When the end product of an allosteric
reaction can then act like an inhibitor.
Example: when it is hot, we sweat to cool down
What are the law of thermodynamics? - ANSWER-Cells cannot take energy out of
thin air, it must harvest it somewhere and energy transfer leads to less organization
or increase in entropy
Why doesn't the cell break down glucose all at once? - ANSWER-Because we don't
use our energy all at onceq
What is the formula of cellular respiration? - ANSWER-6O2 + C6 H12 O6 --> 6CO2 +
6H2O + Energy
What is ATP? - ANSWER-A molecule of adenosine bonded to three phosphates
CELLULAR RESPIRATION PRACTICE
REVIEW TEST QUESTIONS AND
ANSWERS
What is activation energy? How do enzymes affect it? - ANSWER-Activation energy
is the energy needed for a chemical reaction to start. Enzymes affect it by acting as
catalysts. Catalysts are substances that speed up reactions by lowering the
activation energy without altering reaction
What is the enzyme-substrate complex? - ANSWER-Enzyme-substrate complex is
when enzymes provide a site where reactants can be brought together and react
How does the induced-fit explanation for enzymes alter the old lock & key thought of
enzymes? - ANSWER-Induced-fit is an enzyme having to change its shape slightly
to fit its substrate. Lock & key means that the enzyme is perfect for their substrate
What are some coenzymes that our bodies rely on? How do they work? - ANSWER-
Our bodies rely on NAD and FAD. Coenzymes help enzymes catalyze reactions
What can alter enzyme activity? - ANSWER-Change in temperature, change in pH,
amount of substrate
Explain how competitive inhibition and noncompetitive inhibition work. - ANSWER-
Competitive inhibition happens when different molecules, similar in shape to the
substrate, compete for the active site of the enzyme. Noncompetitive enzyme
inhibition happens when allosteric regulators bind to a site causing a change in the
enzyme shape inhibiting the enzyme to catalyze substrates
Explain feedback inhibition - ANSWER-When the end product of an allosteric
reaction can then act like an inhibitor.
Example: when it is hot, we sweat to cool down
What are the law of thermodynamics? - ANSWER-Cells cannot take energy out of
thin air, it must harvest it somewhere and energy transfer leads to less organization
or increase in entropy
Why doesn't the cell break down glucose all at once? - ANSWER-Because we don't
use our energy all at onceq
What is the formula of cellular respiration? - ANSWER-6O2 + C6 H12 O6 --> 6CO2 +
6H2O + Energy
What is ATP? - ANSWER-A molecule of adenosine bonded to three phosphates
