00:01
A question is really about the structure of rna and just reminding us what rnas are made of.
00:08
Normally, of course, ironas are single -stranded, although they can, as the question points out, form -based pairs.
00:18
So just a quick review, remember that we have purines and perimidines, and the purines include the adenine and guanine.
00:33
And then we also have perimidines, and these include cytosine, cymein, which of course is found in dna, not in rna, and then uroscel, which is, of course, found in rna.
01:06
The other thing to remember, of course, we always pair a pyrine with a perimidine.
01:10
Remember that these have two rings, so two doesn't look like it, and, of course, these have one ring.
01:22
So we always pair a two ring with a one ring structure, and that's how the distance and the inside of a dna molecule is maintained.
01:33
And what we're asked is to figure out what guanine is pairing with here.
01:40
Now, we'd expect guanine to normally be pairing with cytosine, but it looks like it's probably pairing with urocell.
01:47
And what we're asked to draw structure and how this might work, and this is just a guess.
01:54
So here's my urocell on this side...