Ch. 3-4
Proteins

2 functions
	Structural material for all living things
	Carry out cell functions
Enzymes
	Made up of amino acids
	20 different kinds of amino acids
		
		NH2-Amino(base)
		CO2H-Carboxyl(acid)
		R- R-group (side group)
	Proteins ALWAYS have nitrogen(unlike carbohydrates-never)
Dipeptide
	2 amino acids
		Form covalent bond - peptide bond
Polypeptide
	Chains
	Many amino acids
	Enzymes
		Biological catalysts
		Names end in -ase
			Sucrase-works on sucrose
			Lactase-works on lactose
				Lactose intolerant-does not produce lactase
		Reactants-substrates
		Active site-place where substrates bond on enzyme
		2 theories
			Lock & key
				Fit EXACTLY into active site
			Best fit
				Fit BETTER than anything else
		Can be used Over and Over
			When substrate bonds, enzyme changes shape
			After reaction the enzyme is released unchanged






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