How many possible trinucleotides are there that contain a uracil base (U),a cytosine base (C),and a guanine base (G)?

Question

Quizplus · Accepted Answer

There are 3 positions for the trinucleotide sequence and each position can be filled with one of the 4 possible nucleotides (A, C, G, U). However, we know that one of the nucleotides is already fixed as U. Therefore, there are only 3 possible choices for the remaining two positions: CG, GC, and UG. This gives us a total of 3 possible trinucleotides.

How Many Possible Trinucleotides Are There That Contain a Uracil