00:01
This question is asking about the structure of dna.
00:05
So if we kind of flatten out the structure of dna, we know that it is composed of a sugar phosphate backbone.
00:14
So every nucleotide has a pentose sugar and then a phosphate group.
00:19
And then these are linked together in kind of a chain to form the backbone of dna.
00:32
Is sugar and phosphate.
00:33
And then each nucleotide will have a nitrogenous base protruding into the center of the ladder, kind of forming the rungs.
00:45
And these are nitrogenous bases, nitrogenous base.
00:54
And there are four different types of, main types of nitrogen spaces, but we break them down in two categories.
01:05
The purines are adenine and guanine.
01:13
So to remember this, i use a little acronym.
01:18
I just remember pure as gold.
01:26
And that helps me remember that the purines are a and g, adenein and guan.
01:34
And from that, i know that the remaining nitrogenous bases are the pyramids, which are c and t.
01:51
So just remember pure as gold, so you know that the purines are a and g.
01:56
Now the other thing to keep in mind is that the purines are actually significantly larger than the peridines...