Hundreds of enzymes catalyze an
array of metabolic reactions. Luckily, we dont have to know all
of the reactions to understand metabolism. We just need to master
the underlying strategies.
For example, all organisms need
a source of energy and raw materials. Different metabolic strategies
have evolved to obtain these resources. Well learn how to
recognize and classify organisms based on these traits.
All metabolic pathways must be
regulated to avoid wasting energy and other precious resources. This
also requires that biosynthetic and degradative pathways be
independently controlled. Control can occur only when the reactions
have large, negative free energy changes.