HAPPY MONDAY Bellwork:

1. Organize Buff Binder2. Study for Vocab Quiz

3. Quickwrite: Summarize what you have learned about carbohydrate, lipids, and proteins in 41 words.

In your summary, you must use the words

Open House Tonight 6pm-7:30pm

Quiz!

Notecard check Thursday

Essential Question: What is the function of

an enzyme?

Enzymes Notes

A. Some chemical reactions that make life possible are too slow to make them practical for living tissue.

B. A catalyst is a substance that speeds up the rate of chemical reactions.

I. What is an enzyme?

C. Enzymes are proteins that act as biological catalysts.1. Enzymes speed up chemical reactions that take place in cells.2. Enzymes are very specific, generally catalyzing only one chemical reaction.3. For this reason, part of an enzyme’s name is usually derived from the reaction it catalyzes. Enzymes usually end in the suffix “–ase”.Ex. Alcohol dehydrogenase catalyzes the reaction that removes water

from alcohol.

A. Enzymes provide a site where reactants can be brought together to react.

B. The reactants of enzyme-catalyzed reactions are known as substrates.

C. The substrates bind to a site on the enzyme called the active site.

D. The fit between the enzyme and its substrate are so precise that it is often compared to a lock and key.

E. The enzyme and substrate are bound together and form the enzyme-substrate complex.

F. Once the reaction is over, the products of the reaction are released and the enzyme is free to start the process again. reuseable

II. How do enzymes work?

Lock-and-key Diagram

Draw, color, and label this diagram

Enzyme animation

Enzyme Enzyme Enzyme

ReactantReactant Product

G. Enzymes play essential roles in regulating chemical reactions, making materials that cells need, releasing energy, and transferring information.

Enzyme animation

H. Enzymes work by lowering the activation energy required to start a chemical reaction.

I. Like all biological molecules, enzymes work best under certain internal conditions.

J. This is another reason why maintaining homeostasis is important for living things.

Draw, color, and label this diagram

Enzyme animation

Enzyme/Substrate Activity:

Design your own connecting analogy to demonstrate an enzyme and substrate.

Color them and label the following:enzyme

substrateenzyme-substrate complex

Then fill in the following analogy:Enzymes and substrates fit together like _______ and

_______.

The Enzyme Lingo

• Enzyme: a protein that speeds up chemical reactions• Catalyst: substance that speeds up the rate of a

chemical reaction• Substrate: the substances that reacts with the

enzyme• Active Site: place where the substrate bonds to the

enzyme

• Enzyme-Substrate Complex: substance formed when the enzyme and substrate bond together

(the “reactant” in the reaction…remember reactants and products?)

As always, summarize what you have learned about enzymes in 30 words. In

your summary, you must use the words:

enzymesubstrateactive site

enzyme-substrate complex