Enzymes

control how many reactions occur

raise activation energy

give permission for the reaction

speed up chemical reactions

carbohydrates, slow down, lowering

proteins, speed up, increasing

lipids, speed up, lowering

proteins, speed up, lowering

The reactions are too slow to meet the needs of the cell if enzymes are missing.

Enzymes supply the oxygen necessary for the reactions.

Enzymes change reactants from solid to liquid during the reactions.

The reactions take up too much space in the cell if enzymes are missing.

calcium channels

active site

receptor molecules

voltage-gated channels

Polypeptide

Co-enzyme

Vitamin

Substrate

puncture

denature

double

delete

60

40

70

30

6

10

9

7