their enzymes are insensitive to temperature

they use molecules other than proteins as their main catalysts

their enzymes have high optimal temperatures

they are able to maintain an internal temperature much cooler than that of the surrounding water

Enzymes can denature (change shape) when the temperature gets too high.

Enzymes can only be used once in a chemical reaction. 

Extreme pH can denature enzymes.

Enzymes speed up chemical reactions. 

Denaturation

Decreased Kinetic Motion

Increased H-Bonding

Dissociation of Ionic Compounds

-ase

-ose

-ic acid

-ate

Competitive lnhibition

Allosteric Regulation

Non-Competitive Inhibition

Feedback Inhibition