Biochemistry- Enzymes

Question 1

What do enzymes do in chemical reactions?

Answer 1

lower activation energy to increase the rate of reaction, make it more likely to occur

Question 2

What 2 things affect enzyme activity?

Answer 2

pH and temperature

Question 3

The synthesis of an enzyme needed for breakdown of a certain structure is initiated by the presence of that substrate:

Answer 3

induction

Question 4

modulation of an enzyme by the nonequivalent binding of a specific metabolite at a site other than the active site is an example of what?

Answer 4

allosteric activity

Question 5

molecules that must undergo cleavage reactions in order to become active are known as what?

Answer 5

zymogens

Question 6

Substances that hold an enzyme in certain configurations so that it can function are known as what?

Answer 6

cofactors, coenzymes

Question 7

Phosphorylation or dephospho rylation of an enzyme is an example of what?

Answer 7

covalent modification

Question 8

An enzyme bound to its coenzyme is known as what?

Answer 8

a holoenzyme (‘whole’)

Question 9

Multiple forms of an enzyme that catalyzes the same reaction but differ from each other in amino acid sequence, substrate affinity and regulatory properties is known as what?

Answer 9

isozyme