00:02
Hello, this question is about which chemicals make up dna.
00:09
So which atoms and molecules make up a strand of dna? well, dna is composed of three things.
00:16
One is a five -carbon sugar.
00:23
Since it is dna, that five -carbon sugar is deoxyribose.
00:32
If it were rna, the sugar is ribose.
00:35
That's the difference between dna and rna.
00:41
Dna contains the five -carbon sugar deoxyribose.
00:45
Dna also contains a phosphate group and one of four nitrogen bases.
01:00
So this is what makes up each nucleotide, and we string the nucleotides together to make dna.
01:09
And the possible nitrogen bases are adenine, vimine, cytosine, or guanine.
01:17
Okay.
01:18
So let's look and see which of these, or which of the things listed there is not one of these.
01:24
So letter a, phosphate...