LO: SWBAT explain why enzymes are necessary for our survival

DN: What are proteins? Give some examples of proteins.

HW:Read pages 49-53, page 49-vocab (7)

Tuesday: page 58# 15, 16, 19, 20, 21, 22

Wednesday: Castle Learning (enzymes)

What role do enzymes play in our bodies?

A + B C

Enzymes speed upchemical reactions

Let’s Review Chemical Reactions:

• A + B Cor

• C A + B

Raw Materials Products

What Reaction is this?

A + B AB + H2ODehydration SynthesisEnzyme

If an enzyme is added to the reaction, then it will speed up the reaction.

In other words, we will produce A-B more quickly.

What is a Catalyst?

A catalyst is any substance that speeds up a chemicalreaction without itself being changed.

Why are enzymes called organic catalysts?

They are PROTEINS!!

What are some important reactions that enzymes need to speed up?

Digestion Synthesis

Photosynthesis Cell Respiration

What are Substrates and Active Sites?

AB

A + B AB

Substrates- are the reactants that bind to the enzyme

Active Site- is the place on the enzyme where thesubstrates bind

Think of enzymes and substrates as a lock and key

Substrate

Enzyme Active Site

Enzyme-Substrate Complex

Is formed when the substrate is bound to the enzyme

Enzyme Substrate

Enzyme-substrate specificity

Enzymes are SPECIFIC (in shape) for the SUBSTRATES

they attach to, just like a lock and key.

How do enzymes work?

A + B AB ENZYME

AB

Enzymes bind to the reactants so the chemicalreaction can take place (that is why AE is lowered).

What do you think determines the shape of enzymes?

Enzyme

1)The sequence (order) of amino acids in a protein determine its shape

2) The shape of a protein determines its activity

WHAT CHANGES?A-B + H2O A + B

Enzyme

What reaction is this?Hydrolysis

The enzyme doesn’t change, it canbe reused

Some common enzymes

PROTEIN AMINO ACIDSprotease

Hydrolysis

Can you ID the substrate, product, enzyme, active site, & enzyme substrate

complex?

SubstrateProduct

Enzyme

Active Site

Enzyme – Substrate Complex