Date post: | 17-Jan-2018 |
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Aim: How do enzymes affect the rate of chemical reactions?
DO NOW:1. Describe the problem in the first
picture.2. Describe the
second picture.3. Define the term
rate.
Enzymes• Proteins• Enzyme names end is -ase• Act as catalysts & speed up the rate of chemical
reactions, for life processes or life activities• Never used up in a reaction, can be re-used• Very specific (shape & function)• Have active sites, to which substrates, will bind
to• Substrates are “acted upon” or changed in the
reaction (the reactants)
Enzymes
• When enzymes & substrates bind, an enzyme-substrate complex, a temporary union, forms(substrate is changed during this time)
• Reactant (s) becomes a product (s)• All organisms (animals, plants, bacteria & fungi)
depend on enzymes• Work best in specific conditions (pH, temperature) • Amount of enzyme & substrate available & enzyme
shape both affect the rate of the reaction
Lock & Key Model
Enzyme Structure
Enzyme-Substrate Complex
Digestive Enzymes
Synthesis Enzymes
Human Body Enzymes
Use of Enzymes Across Sectors
Enzyme Animation
• http://highered.mheducation.com/sites/0072495855/student_view0/chapter2/animation__how_enzymes_work.html
• http://www.kscience.co.uk/animations/anim_2.htm
Let’s Practice!