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Biology
Chapter 3*
17
Biology
Undergraduate 1
09/19/2010

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Term
Four Major Categories of Organic Molecules
Definition
1. Carbohydrates
2. Lipids
3. Proteins
4. Nucleotides and Nuclei Acids
Term
Lipids
Definition
1. Oils, fats, and waxes
2. Phospholipids
3. Steroids
Term
Oils, fats, and waxes
Definition
Ex) triglyceride = a lipids composed of three fatty-acid molecules bonded to a single glycerol molecule
No rings...fatty acid chains
Term
Phospholipids
Definition
Similar to triglycerides except phosphate group substitutes for one of the fatty acids. Forms membranes. Contains a variable function group (of a phosphate group and glycerol backbone) and a hydrophobic double bond.
No rings...fatty acid chains.
Term
Steroids
Definition
Composed of 4 carbon rings fused together with functional groups attached to the rings. Signals molecules and is a membrane component.
Term
Protein
aka Peptides2-50 /Polypeptide 50+
Definition
One or more chains of amino acids
Term
Amino Acid
Definition
A carbon with 3 defined and one variable group. Forms chains
Term
Chemical composition of Proteins
Definition
One or more chains of amino acids. R represents the variable functional group.
Dehydration synthesis forms chains.
Term
Functions of Proteins
Definition
Structure / movement / defense / storage / signaling / catalyzing reactions
Term
Proteins Chemical Structure
Definition
1. Primary Structure
2. Secondary Structure
3. Tertiary Structure
4. Quaternary Structure
Term
Primary Structure
Definition
Sequence of amino acids linked by peptide bonds.
Covalent Bond.
Term
Secondary Structure
Definition
Hydrogen bonds link hydrogen from amino groups to 0 of tarboyl group
Term
Tertiary Structure
Definition
Folding together of an alpha helix and a beta sheet.
Disulfide and hydrogen bond.
Term
Quaternary Structure
Definition
Hydrogen, disulfide, and ionic bond
Term
Nucleotides and Nucleic Acids
Definition
Chemical composition
1. 5 carbon sugar (ring)
2. Phosphate group
3. Base (1 or 2 rings)
Term
Nucleotides
Definition
Small monomer that 1) carries energy 2) is an intracellular messenger 3) are the building blocks of nucleic acids
ex) ATP
Term
Nucleic Acids
Definition
Long polymers of nucleotides.
Function: molecules of heredity
ex) DNA and RNA
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