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Biology
Bio Chapter 3
22
Biology
Not Applicable
10/30/2005

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Term
Carbohydrate
Definition
An organic compound present in the cell of all living things and a major organic nutrient for humans.

ex: glucose
Term
Dipeptide
Definition
A formation from two amino acids bonded together by means of a condensation (dehydration synthesis) reaction.
Term
Disaccharide
Definition
A double sugar formed from two monosaccharides.

Glucose + fructose = sucrose
Term
Fatty Acid
Definition
A monomer that is part of most lipids. It is an unbranched carbon chain.
Term
Hydrophobic
Definition
Referring to the molecular repulsion of water.

ex: lipids
Term
Hydrophillic
Definition
Referring to the molecuilar attraction to water.
Term
Isomer
Definition
One of two or more compounds that differ in structure but not in molecular composition.
Term
Nucleic Acid
Definition
An organic molecule, DNA and RNA, that stores and carries important information for cell function.
Term
Nucleotide
Definition
A monomer of DNA and RNA consisting of anitrogen base, a sugar, and a phospphate group.
Term
Peptide Bond
Definition
A covalent bond between two amino acids. The bonds that hold protein together.
Term
Phospholipid
Definition
A complex lipid having two fatty acids joined by a molecule of glycerol.
Term
Polypeptide
Definition
A long chain of several amino acids.

(protein)
Term
Polysaccharide
Definition
A complex carbohydrate composed of three or more monosaccharides.
Term
Monosaccharide
Definition
A simple sugar such as fructose or glucose.

carbohydrate monomer
Term
Lipid
Definition
A kind of organic compound that is insoluble in water. SUch as fats and steroids.

fats, oils, and waxes

long term energy storage
Term
Protein
Definition
An organic compound composed of one or more chains of polypeptides which in turn are formed from amino acids make up muscles, they are enzymes.
Term
Amino Acid
Definition
A carboxylic acid with an amino group; one of 20 monomers that form proteins.

ex; glycine
Term
Wax
Definition
A type of lipid. Consists of a long fatty-acid chain joined to a long alchohol chain. Highly waterproof.
Term
Steroid
Definition
A lipid in which the molecule is composed of four carbon rings

Acts as a hormone

ex: Cholesterol
Term
Substrate
Definition
What teh enzymes starts with in a chemical reaction. It can be once thing or more than one.
Term
Triglyceride
Definition
A lipid made of three fatty-acid molecules and one glycerol molecule.
Term
Ribonucleic Acid

(RNA)
Definition
A nucleic acid composed of a single strand and distinguished from DNA by containing ribose and uracil.
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