A primary transcript immature non processed single stranded...

A primary transcript (immature, non-processed) single-stranded RNA molecule has the following nucleotide composition: 30% A, 20% G, 24% C, and 26% U. What is the nucleotide composition of the double-stranded DNA molecule from which it was transcribed? Choose one: • 20% A, 30% G, 26% C, and 24% T • 30% A, 20% G, 24% C, and 26% T Ο 26% A, 24% G, 20% C, and 30% T Ο 26% A, 24% G, 20% C, and 30% U • 28% A, 22% G, 22% C, and 28% T

Transcript

00:01 All right, so in this question, we are given the nucleotide composition of a primary transcript of rna, and we're being asked, what is the dna nucleotide composition that this rna transcript kind of arose from.

00:16 So in order to answer this, we first just need to know and be aware of our base pairing rules.

00:22 So i'm going to write this just over to the side.

00:25 So c always pairs with g.

00:29 A pairs with t.

00:32 If we're talking rna, obviously rna does not have thymine in its replacement.

00:38 It has u or a ura cell.

00:41 So obviously we are given an rna transcript so we see that we have a ura cell.

00:45 However, we are being asked to convert this back into our dna sequence.

00:50 So we're going to have to keep this in mind and make sure in our dna we are including thymine.

00:56 So the rna transcript is formed off of our template strand of dna.

01:01 So i'm going to drop that down over here.

01:03 So we first need to find the nucleic acid composition of the template strand of dna.

01:18 So in order to do this, we're just going to look at our percentages and our base pairing rules.

01:24 So like i said, a always pairs with t.

01:28 So a will pair with t nucleotides or arise from it.

01:36 So percentage -wise, because they always pair with each other, it has to be equal.

01:42 So 30 % t.

01:45 Next we have g that pairs with c, and this will be 20 % c.

01:57 C pairs with g, so 24 % g.

02:07 And then lastly, u is going to pair with a, so that gives us 26 % a...

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