Unit 2: The Living Cell
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Chapter 4
Molecules of Life
Review
Macromolecules
are formed by linking subunits of
through
synthesis
and broken down by
reactions.
There are
classes of macromolecules.
Proteins are polypeptides linked by
acids
with covalent
bonds,
and exhibits hierarchical
levels
of
structure.
Nucleic acids, such as
and
, are long chains of
nucleotides
which can be twisted into a
double
.
Carbohydrates (
sugars
) are made from
monomers such as
.
Simple sugars include
such as
sucrose
and
lactose;
longer sugar molecules are called complex
sugars
or
.
Lipids are
molecules
composed of
acids and include
and
fats, as well as
phospholipids.
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Feb 11, 2010
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