Biology 1000: with Bidawit Macomb
Community College Exam 2 Questions
All Answered Correct.
What is energy? - Answer Energy is the ability to do work or bring about a change.
Kinetic energy - Answer Energy of motion.
•Mechanical electricity
What is potential energy? - Answer Stored energy.
•Chemical energy
What is the first law of thermodynamics? - Answer Energy cannot be created or destroyed,
but can be changed from one form to another.
What is the second law of thermodynamics? - Answer When energy is changed from one
form to another, there is a loss of energy that is available to do work.
Metabolism - Answer the sum of cellular chemical reactions in a cell.
Endergonic reactions - Answer Products have more free energy than reactants (require
energy input).
•These are nonspontaneous.
Exergonic reaction - Answer Products have less free energy than reactants (release energy).
•These occur spontaneously.
What are Catalysts - Answer Protein molecules function as catalysts
Each one accelerates a specific reaction
, Each reaction in a metabolic pathway requires a unique and specific ____________
End product will not be formed unless ALL are present and functional in pathway: ENZYMES
The affect of temperature on enzymes - Answer Warmer temperatures cause more effective
collisions between enzyme and substrate.
However, hot temperatures can denature and destroy enzymes.
What the active site of an enzyme is and what it binds to - Answer the region on the enzyme
where the substrate (reactants) binds
Causes site to change shape
The shape change forces substrates together, initiating bond formation.
What the induced fit model says - Answer The enzyme is induced to undergo a slight
alteration to achieve optimum fit for the substrates.
How enzymes affect reactions - Answer Enzymes operate by lowering the energy of
activation.
This is accomplished by bringing substrates into contact with one another.
•This influences the rate of reaction and is why enzymes are catalysts of chemical reactions.
Competitive inhibition - Answer The substrate and the inhibitor are both able to bind to the
active site, and they compete with one another.
•The product forms only when the substrate binds to the active site.
Non competitive inhibition - Answer The inhibitor does not bind at the active site, but at an
allosteric (allo means "other") site.
•A change in shape initiated by an inhibitor binding to the allosteric site changes the shape of
the active site, making it unable to bind to its substrate
Oxidation - Answer loss of electrons
Community College Exam 2 Questions
All Answered Correct.
What is energy? - Answer Energy is the ability to do work or bring about a change.
Kinetic energy - Answer Energy of motion.
•Mechanical electricity
What is potential energy? - Answer Stored energy.
•Chemical energy
What is the first law of thermodynamics? - Answer Energy cannot be created or destroyed,
but can be changed from one form to another.
What is the second law of thermodynamics? - Answer When energy is changed from one
form to another, there is a loss of energy that is available to do work.
Metabolism - Answer the sum of cellular chemical reactions in a cell.
Endergonic reactions - Answer Products have more free energy than reactants (require
energy input).
•These are nonspontaneous.
Exergonic reaction - Answer Products have less free energy than reactants (release energy).
•These occur spontaneously.
What are Catalysts - Answer Protein molecules function as catalysts
Each one accelerates a specific reaction
, Each reaction in a metabolic pathway requires a unique and specific ____________
End product will not be formed unless ALL are present and functional in pathway: ENZYMES
The affect of temperature on enzymes - Answer Warmer temperatures cause more effective
collisions between enzyme and substrate.
However, hot temperatures can denature and destroy enzymes.
What the active site of an enzyme is and what it binds to - Answer the region on the enzyme
where the substrate (reactants) binds
Causes site to change shape
The shape change forces substrates together, initiating bond formation.
What the induced fit model says - Answer The enzyme is induced to undergo a slight
alteration to achieve optimum fit for the substrates.
How enzymes affect reactions - Answer Enzymes operate by lowering the energy of
activation.
This is accomplished by bringing substrates into contact with one another.
•This influences the rate of reaction and is why enzymes are catalysts of chemical reactions.
Competitive inhibition - Answer The substrate and the inhibitor are both able to bind to the
active site, and they compete with one another.
•The product forms only when the substrate binds to the active site.
Non competitive inhibition - Answer The inhibitor does not bind at the active site, but at an
allosteric (allo means "other") site.
•A change in shape initiated by an inhibitor binding to the allosteric site changes the shape of
the active site, making it unable to bind to its substrate
Oxidation - Answer loss of electrons
