Enzymes

Enzymes are

• chemical catalyst

• biological catalysts

• slows down reaction

• alter or speed up chemical reactions

• remain chemically unchanged at the end of the reaction

Enzymes................

• increases activation energy

• decreases activation energy

• maintains activation energy

Activation energy is the energy needed ................... a reaction

• to end the reaction

• throughout the reaction

• to start the reaction

Enzymes are required in minute amounts because

• remain chemically unchanged at the end of the reaction so that can be reused again and again.

• highly specific in their action.

• They also have a specific active site which only allows substrates with a complementary 3-D shape to that of the active site to bind.

Enzymes are highly specific in their action because

• remain chemically unchanged at the end of the reaction so that can be reused again and again.

• they also have a specific active site which only allows substrates with a complementary 3-D shape to that of the active site to bind

• T.required in minute amounts because

Enzymes act based on the .............. hypothesis

• large surface area to volume ratio

• fork and spoon

• lock and hammer

• lock and key

In the lock and key hypothesis,

• the enzyme is the lock and the substrate is the key

• the substrate is the lock and the enzyme is the key

• both substrate and enzyme is the lock

• both substrate and enzyme is the key

When the substrate and the enzyme binds, the form the .....

Enzyme action is affected by

• pH

• environment

• temperature

• amount of light

Extreme pH and temperature will cause the enzyme to.....