Lecture 9- Introduction To Enzymes And Catalysis Flashcards
Delta G is positive means what?
Needs an input of energy
Delta G is negative means what?
Reaction can take place spontaneously.
Delta G provides info on the rate of a reaction. True or false?
False; Delta G provides no info on the rate of a reaction.
What is dependent upon Delta G?
The position of a reaction at equilibrium (the extent at which it will go in a certain direction).
What is activation energy? 2 answers
The minimum energy required to convert reactants to products during a collision between molecules.
Also, the energy required to position atoms for a reaction.
“The minimum energy required to convert reactants to products during a collision between molecules” is what?
Activation energy
As an overall concept, enzymes do what?
Enzymes lower the activation energy for reactions
What lowers the activation energy for reactions?
Enzymes
For delta G, when can a reaction take place spontaneously? When does it need an input of energy?
Negative; positive.
How does an enzyme lower the activation energy?
The enzymes binds tightly to one or more molecules and holds them in a precise configuration.
In addition to lowering the AE, enzymes do what?
They lower the energy barrier.
Enzymes are typically used to make or break what type of bonds?
Covalent bonds.
What is a catalyst?
A molecule or substance that can lower the AE for a reaction.
In terms of equilibrium, what CANT enzymes do?
They cannot change the equilibrium point for a reaction.
Why won’t the equilibrium position for the reaction be changed for enzymes?
They lower the AE for both the forward and backward reaction equally.
True or false: Enzymes choose to lower the AE for an unspecific type of reaction.
False; enzymes are selective and precise
For the enzyme, where do substrates bind and undergo catalysis?
At the active site?
What is the active site in the enzyme responsible for?
It is where the substrate binds and undergoes catalysis.