Transcript Chapter 2
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
2-4 Chemical Reactions and Enzymes
Enzymes
biological
catalysts
Speed up reactions
Without them
reactions would
occur too slow for
life
Lower the activation
energy
Enzymes
Enzymes provide a site where substrates can
be brought together = Active Site (tertiary)
The fit is like a lock and key
Enzyme Regulation
Work best at a
particular pH
Affected by changes
in temperature
Digestion enzyme
Denaturization
Concentration
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?