enzymes a review of how they work
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Enzymes A review of how they work. Generate a definition of Enzymes. Proteins that promote specific rxns in cells by lowering activation energy required to start a rxn. How do enzymes work?. Lower activation energy increase speed of metabolic rates Break down….build up???. - PowerPoint PPT PresentationTRANSCRIPT
Enzymes A review of how they work
Generate a definition of Enzymes
• Proteins that promote specific rxns in cells by lowering activation energy required to start a rxn.
How do enzymes work?• Lower activation energy• increase speed of metabolic rates• Break down….build up???
Anatomy of Enzyme Action
Induced fit model
• Enzymes are specific
• http://www.phschool.com/science/biology_place/labbench/lab2/induced.html
• http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_enzymes_work.html
What happens after an enzyme does its job?
• Required in small amounts because as they
work, not consumed.
Factors that affect how enzymes work?
• Temperature• pH• Amount of substrate available
Brainstorm of Enzymes
• Saliva• Stomach • Nervous system: AcHase• Milk products• Papaya fruit• Unprocessed fruits• Kiwi: actiniclin• Soybeans (lipoxygenase)• Fireflies (luciferase)• Pineapples (bromelain)• Potatoes• Egg whites• Turnips (peroxidase)• Tears• Yeast (sucrase)• Lactase• Onions• detergents
How do you know “enzymes” are working?
http://www.enetez.com/images/default/for_sale.jpg
Challenge• Design an experiment that will test the
effectiveness of an enzyme on the protein gelatin.
• Stipulations– Experiment will be performed in class period – conduction is totally designed by experimenters– Enzyme will be proteases (source: detergent)– Data collection must be qualitative and quantitative
• Review scoring guide for how you will be graded
materials• Test tubes• Petri dishes• gelatin• Water• Detergent (u supply)• Ruler• Straws• Sharpie/wax pens
Exit slip
• List of materials• Independent variable• Dependent variable• Constants• Control• Experimental (treatment
group)• What are you measuring
http://www2.visalia.k12.ca.us/eldiamante/science/biology/taters/enzyme_mc.htm