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Protein Structure Primary - sequence of amino acids Secondary – folding into pleated sheets or alpha helix Tertiary – 3-D structure, completely folded.

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Presentation on theme: "Protein Structure Primary - sequence of amino acids Secondary – folding into pleated sheets or alpha helix Tertiary – 3-D structure, completely folded."— Presentation transcript:

1 Protein Structure Primary - sequence of amino acids Secondary – folding into pleated sheets or alpha helix Tertiary – 3-D structure, completely folded  Most proteins stop here Quaternary – interaction of several protein molecules  Hemoglobin

2 2-4 Chemical Reactions and Enzymes Enzymes  biological catalysts  Speed up reactions  Without them reactions would occur too slow for life  Lower the activation energy

3 Enzymes Enzymes provide a site where substrates can be brought together = Active Site (tertiary)  The fit is like a lock and key

4 Enzyme Regulation Work best at a particular pH  Digestion enzyme Affected by changes in temperature  Denaturization Concentration

5 p. 51  Suggest an explanation for the change at 40 sec. in the control.  How does the base affect the enzyme?  How does the acid effect the enzyme?

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