Chapter 4: Enzymes Flashcards Preview

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Flashcards in Chapter 4: Enzymes Deck (16):
1

speed up the rates of reactions by many millions of times without the need for an increase in temperature

enzymes

2

the biochemical modification and use of organix molecules and energy to support the activities of life

metabolism

3

even when a reaction is spontaneous the reaction will not start unless a small amount of ___ is added

activation energy

4

a chemical agent that accelerates the rate of a reaction without being changed by the reaction

catalyst

5

the reactant that an enzyme acts on is called ?

substrate

6

each type of enzyme catalyzes the reaction of a single type of substrate molecule or group of closely related molecules

Enzyme Specificity

7

substrate interacts with a small pocket or groove in the enzyme molecule

active site

8

further increases in substrate concentration have no effect on reaction rate

saturated

9

a nonprotein group that binds to the enzyme, for catalytic activity

cofactor

10

other cofactors are small organic molecules which are often derived from vitamins
-bind loosely to enzymes

coenzymes

11

inhibitors bind to the active site, blocking access for the normal substrate- sowing or stopping the reaction

competitive inhibition

12

inhibitors bind at a location other than the active site- reducing the ability of the active to bind substrate

noncompetitive inhibition

13

enzyme activity is controlled by the reversible binding of a regulatory molecule to the allosteric site

allosteric regulation

14

a location on teh enzyme outside the active site

allosteric site

15

excess accumulation of a product often inhibits the enzymatic reaction producing it

feedback inhibition or end- product inhibition

16

group of RNA molecules that accelerate the rate of certain biological reactions without being changed by the reactions

Ribozymes