5.  Arrange the following structures/chemicals in order of size from smallest to largest.

a.  codon    b. gene     c.  base    d.  chromosome     base, codon, gene, chromosome

Remember, a codon is a sequence of three nucleotide bases and a gene is 1,000 to 2,000 nucleotide bases in length.

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Emma Erdahl, Associate Professor of Biology
Northern Virginia Community College
Revised 8/23/00