A DNA sequence consists of a string of elements called nucleotides, in a defined order. Suppose the DNA sequence of a virus is 20 nucleotides long. If each nucleotide can be either a G, T, C, or A, how many different sequences are possible?

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A DNA sequence consists of a string of elements called nucleotides, in a defined order.
Suppose the DNA sequence of a virus is 20 nucleotides long. If each nucleotide can be
either a G, T, C, or A, how many different sequences are possible?
Transcribed Image Text:A DNA sequence consists of a string of elements called nucleotides, in a defined order. Suppose the DNA sequence of a virus is 20 nucleotides long. If each nucleotide can be either a G, T, C, or A, how many different sequences are possible?
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