How many guanines are in a DNA molecule 1000 base pairs long if 20% of the molecules consist of adenines?
2007-01-24 08:13:10 · 3 answers · asked by djpyro04 2 in Science & Mathematics ➔ Biology
If 20% of the bases are A then 20% are T. That means the remaining 60% are G or C, so 30% of the bases are Guanine.
That idea that A=T and G=C is consistent for most DNA (everything except for a few odd viruses that don't have double-stranded DNA)
2007-01-24 08:21:09 · answer #1 · answered by hcbiochem 7 · 2⤊ 0⤋
All you need to know for this are the 4 bases and how they pair. You should know that adenine pairs with thyronine, and guanine pairs with cytosine. You know that for every A there must be a T, and for every G there must be a C. If 20 is A then 20 is T. Leaving 60%.
2007-01-24 08:20:27 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Its 30% guanine or 300 nucleotides
2007-01-24 12:07:15 · answer #3 · answered by Allie H. 5 · 0⤊ 0⤋