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The octet rule is when atoms combine to form molecules, they generally each lose or gain or share valence electrons until they attain or share eight.

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A valence electron is an outer shell electron that is associated with an atom.

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A polar molecule is an asymmetric molecule with a non-uniform positive and negative charges.

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A hydrogen bond is a week bond between two molecules resulting from an electrostatic attraction between a protein in one molecule and an electronegative atom in the other.

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A covalent bond is a chemical bond that involved the sharing of electron pairs between atoms.

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Nucleotide is a simple organic compound consisting of a nucleoside linked to a phosphate group.

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Amino acids are simple organic compounds containing both a carboxyl and an amino group

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Lipid is a class of organic compounds that are fatty acids or their derivates and are insoluble in water.

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Carbohydrates are a large group of organic compounds occurring in foods and living tissues including sugars, starch and cellulose.

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Inorganic chemistry is the branch of chemistry that deals with non organic compounds.

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Organic chemistry is the chemistry of carbon compounds

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There are two different types of nucleic acids; DNA and RNA. Nucleic acids have the ability to pair with each other within the cell.

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Proteins are chains of amino acids which are linked together by peptide bonds. The amino acid sequence of a protein determines its structures and functions. Collagen is the most abundant mammalian protein.

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Triglyceride is composed of three fatty acid molecules and on glycerol molecule.

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Glucose is a hexose.  It is a sugar that is made up of six carbon atoms that are most commonly in a ring form. There are thousands of glucose monomers in a single starch molecule. Glucose is added to starch by a condensation reaction causing two molecules to covalently bond together and release water.

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A polymer is a chain of similar subunits, or monomers that are linked together by a covalent bond.

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There are four main types of macromolecules; proteins, carbohydrates, nucleic acids and lipids.

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Biochemistry is the branch of science concerned with the chemical and physicochemical processes that occur within living organisms.