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Molecules of Life
Biology
82
Biology
Undergraduate 1
02/05/2011

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Term
organic compounds
Definition
Contains the element carbon and
at least one hydrogen atom.
Term
• Carbohydrates
• Lipids
• Proteins
• Nucleic Acids
Definition
organic compounds
Term
Outer shell of carbon
has
Definition
4 electrons
Term
Each carbon atom
can form covalent
bonds
Definition
with up to four
atoms
Term
Carbon atoms can
form
Definition
chains or rings
Term
Carbohydrate
Definition
simple sugars
Term
Lipids
Definition
fatty acids
Term
Proteins
Definition
amino acids
Term
Nucleic Acids
Definition
nucleotides
Term
Monomers
Definition
individual subunits that make up
larger molecules
Term
Polymers
Definition
large molecules made up of
three to millions of monomers
Term
Functional Groups
Definition
Atoms or clusters of atoms that are covalently bonded to
carbon backbone
Term
Functional Groups give organic compounds
Definition
their different properties
Term
Functional Groups are responsible for the structural and functional diversity of
Definition
cells and multicelled organisms
Term
• Important features of the molecules of life arise from the
nature, kind, and arrangement of
Definition
functional groups
Term
Hydroxyl group
Definition
OH
Term
Amino group
Definition
NH3+
Term
Carboxyl group
Definition
COOH
Term
Phosphate group
Definition
PO3-
Term
Sulfhydryl group
Definition
SH
Term
Types of Reaction
Definition
Functional group transfer
Term
Electron transfer
Definition
Types of Reaction
Term
Condensation Reactions
Definition
Form polymers from
subunits
Term
Hydrolysis
Definition
A type of cleavage
reaction
Term
Hydrolysis breaks polymers into
Definition
smaller units
Term
Carbohydrate
Definition
Monosaccharide
Term
Oligosaccharides
Definition
Carbohydrates
Term
Monosaccharides
Definition
Simplest carbohydrates
Term
Most are sweet tasting, water soluble
Definition
Monosaccharides
Term
Disaccharides
Definition
Type of
oligosaccharide
Term
Formed by
condensation reaction
Definition
Disaccharides
Term
Polysaccharides
Definition
Straight or branched chains of many sugar
monomers
Term
Cellulose & Starch
Definition
Differ in bonding
patterns between
monomers
Term
Cellulose
Definition
tough,
indigestible,
structural material
in plants
Term
Starch
Definition
easily
digested, storage
form in plants
Term
Glycogen
Definition
Sugar storage form in animals
Term
• When blood sugar decreases,
Definition
liver cells degrade glycogen,
release glucose
Term
Chitin
Definition
Polysaccharide
Term
Nitrogen-containing groups attached to
glucose monomers
Definition
Chitin
Term
Chitin occurs in
Definition
protective body
coverings of many animals, including
ticks
Term
Lipids
Definition
Most include fatty acids
Term
Sterols and their derivatives have
Definition
no fatty
acids
Term
Lipids tend to be
Definition
insoluble in water
Term
Fats
Definition
Fatty acid(s)
attached to
glycerol
Term
Triglycerides
are most
common
Definition
Fat
Term
Saturated
Definition
Single bonds between carbons
Term
Unsaturated
Definition
One or more double bonds
Term
Phospholipids
Definition
Main components of cell
membranes
Term
Waxes
Definition
Long-chain fatty acids linked to
long chain alcohols or carbon rings
Term
Firm consistency, repel water
Definition
Waxes
Term
Waxes are important in
Definition
water-proofing
Term
Bees construct honeycombs from their
own
Definition
waxy secretions
Term
Sterols and Derivatives
Definition
No fatty acids
Term
Rigid backbone of
four fused-together
carbon rings
Definition
Sterols and Derivatives
Term
Properties of Amino Acids
Definition
Determined by the “R
group”
Term
Amino acids may be
Definition
Non-polar
Term
Protein
Definition
chain of amino acids linked
by peptide bonds
Term
Peptide bond
Definition
Type of covalent bond
Term
Links amino group of one amino acid with
carboxyl group of next
Definition
Peptide bond
Term
Primary Structure
Definition
Sequence of amino acids
Term
dipeptide
Definition
Two linked amino acids
Term
polypeptide
Definition
Three or more
Term
Fibrous proteins
Definition
Polypeptide chains arranged as strands or
sheets
Term
Globular proteins
Definition
Polypeptide chains folded into compact,
rounded shapes
Term
Primary structure influences shape by
Definition
allowing hydrogen bonds to form between different amino acids along length of chain
Term
Hydrogen bonds form between different
parts of
Definition
polypeptide chain
Term
Quaternary Structure
Definition
Some proteins
are made up of
more than one
polypeptide
chain
Term
Lipoproteins
Definition
Proteins combined with cholesterol,
triglycerides, phospholipids
Term
Glycoproteins
Definition
Proteins combined with oligosaccharides
Term
Denaturation
Definition
Disruption of three-dimensional shap
Term
Breakage of weak bonds
Definition
Denaturation
Term
Glutamate
Definition
negative charge
Term
valine
Definition
no
net charge
Term
Sugar
Definition
Ribose or deoxyribose
Term
Base
Definition
Nitrogen-containing
Term
Nucleotide Function
Definition
Energy carriers
Term
Nucleic Acids
Definition
Composed of
nucleotides
Term
Single- or double-
stranded
Definition
Nucleic Acids
Term
DNA
Definition
Double-stranded
Term
Consists of four
types of nucleotides
Definition
DNA
Term
RNA
Definition
Usually single strands
Term
contains the base uracil in
place of thymine
Definition
RNA
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