|Figure 2-9 Cholesterol, a steroid.
All steroids have a basic
of four rings (three 6-carbon
one 5-carbon ring)
with various side groups
Steroids are complex alcohols. Although
they are structurally unlike
fats, they have fatlike properties. The
steroids are a large group of biologically
important molecules, including
cholesterol (Figure 2-9), vitamin D,
many adrenocortical hormones, and
the sex hormones.