Bellwork: Make sure that your write up on page 32 is complete from yesterday

Science Fact of the Day: Sheep, goats, and the octopus have almost rectangular-oval pupils in their eyes.

Alka-seltzer lab IV. Data (you should run 2 trials) – You need a data table and a graph V. Conclusion VI. Analysis: What other factors might speed up a reaction? Is there a point when increasing the temperature doesn’t have an effect anymore? (Explain)

Set up Cornell notes on page 33 Title: Enzymes Essential Question: What is a catalyst?

Enzymes… Enzymes are special proteins that work in the body to help speed up reactions Catalyst: a substance that helps to speed up a chemical reaction but is not used up in the reaction Because enzymes do this in the body they are known as biological catalysts. They can be used over and over again. amylase - in saliva pepsin - in stomach Lactase - breaks down lactose DNA Polymerase I (DNA replication) DNA Polymerase III (DNA replication) RNA Polymerase (mRNA synthesis) Helicase (DNA replication) Ligase (DNA replication)

Enzyme function Enzymes work best under certain internal conditions. Enzymes help maintain homeostasis in living organisms. Enzymes reduce the activation energy needed in a reaction and speed up the rate at which the reaction is completed.

Enzymes are VERY specific and perform very specialized tasks Substrates are chemicals that bind to the enzyme and become altered (bonds formed and/or broken), producing a product Enzymes have specific shapes that match or react with specific substrates (like a lock and key) Draw this in your notes complex

Homework Enzymes a fun introduction (youtube)