Question

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a student compares the dna sequence of three unrelated organisms. what similarity will the student find in the dna sequences?
○ the dna sequences of all three organisms are made up of four nucleotides: a, t, c, and g.
○ the dna sequences of all three organisms have the same orders of base pairs.
○ the dna sequences of all three organisms are made up of five nucleotides: a, t, u, c, and g.
○ the dna sequences of all three organisms have very little in common.

Explanation:

All cellular DNA (regardless of organism) is composed of the four nucleotides: adenine (A), thymine (T), cytosine (C), and guanine (G). Uracil (U) is only found in RNA, not DNA. Unrelated organisms will have different base pair orders, and while they share the nucleotide building blocks, their full sequences will not be nearly identical.

Answer:

The DNA sequences of all three organisms are made up of four nucleotides: A, T, C, and G.