Bio quesstttion

[Syringer]

"If a given piece of double stranded DNA contains 20% A nucleotides, what fraction of the molecule would be purines?"

I get 60% as the answer..but it's 50%. How?

 

[QueHuong]

60% is the answer, maybe you misread the 6 as a 5?

 

[Pshawn5]

got 60% as well.

 

[Syringer]

Okay, it is 50..

[22:51] Emily: A is a purine
[22:51] Emily: pairs with T, a pyrimidine
[22:51] Emily: so T is also 20
[22:52] Emily: G and C make up other 60
[22:52] Emily: G is the other purine, must be 30
[22:52] Emily: 30+20 = 50