The
overall
process
involves
two
types
of
reactions
namely
catabolic
reactions
in
which
glucose
is
broken
down
to
smaller
fragments
and
anabolic
reactions
in
which
the
breakdown
products
are
used
in
biosynthetic
reactions.
The
former
type
of
reactions
are
exergonic
(energy
yielding)
reactions
and
yield
energy
in
the
form
of
ATP
while
the
latter
reactions
involve
the
expenditure
of
energy
(endergonic).
The
catabolic
reactions
therefore
provide
the
precursors
as
well
as
energy
for
the
subsequent
biosynthesis
of
macro mo1ecules
| 
