Question of the Day If Little Mickey's Mom has four children, Penny, Nickel, and Dime. What is the fourth child's name? A Rooster stood on the roof of a barn and laid an egg. Which way did the egg roll, North or South? – The wind is blowing from the East.

Enzymes, Photosynthesis, & Cellular Respiration Entire Unit 2012

Goals for the Day 1.Be able to describe what an enzyme is and why it is important. 2.Be able to define denaturing and how proteins could become denatured.

Question of the Day What two things can denature an enzyme? What does it mean to denature an enzyme?

Chemical Reactions The breaking down or building up of substances -Enzymes Help Accomplish

Example of a chemical equation Na + Cl NaCl The arrow is like an equals sign

-The breaking down or building up of substances Reactants = what we start with Products = what we end with Chemical Reactions

Example of a chemical equation Na + Cl NaCl The arrow is like an equals sign

Chemical Reactions Chemical reactions require energy to start

Chemical Reactions What does activate mean? (Think about activating your new cell phone) Activation Energy -is the energy needed to start a chemical reaction

Catalase 2H 2 O 2 Catalase 2H 2 O + O 2

Substrate: Molecule that uses an enzyme Active Site : Folds in an enzyme where the substrate fits

Activation Energy is the energy needed to start a reaction ENERGY TIME ACTIVATION ENERGY Products Reactants

Enzymes Enzyme – A protein that acts as a catalyst Catalyst – a substance that speeds up a chemical reaction without being used up or destroyed. Enzymes are responsible for almost ALL chemical reactions in living things (Organisms).

Enzymes How does an enzyme speed up a chemical reaction? ENZYMES speed up a chemical reaction by lowering the activation energy

Enzymes ENZYMES speed up a chemical reaction by lowering the activation energy (the amount of energy required to start a reaction) ENERGY TIME ACTIVATION ENERGY Products Reactants ACTIVATION ENERGY with ENZYME

Enzymes We put the enzyme above the arrow, and not on the side of the reactants or products Example of a chemical equation Reactants Product AB A + B ENZYME

ENZYMES Enzymes do not ever get used up. Enzymes do not die, but they can denature (become unusable, ruined, no longer work)

Catalase 2H 2 O 2 Catalase 2H 2 O + O 2

ENZYMES Three things that effect enzyme activity 1.Temperature 2. pH (acidic or basic) 3. Concentration (how many enzymes are working)