Hi,
I have a problem. I dont remember how to caculate of numbers
Please help
How many guanines in a DNA molecule 1000 base pairs long if 20% of the molecules consist of adenines? Show your math and inclue a verbal explanation.
So I dont know how to do this. Please help me out
2007-12-20 10:18:09 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Biology
The percentage of adenine 20% means A-T base pair percentage is 20%.
So in a DNA , if percentage of A-T base pair is 20 then the remaining percentage should be C-G base pair.
That is 80 %
So The percentage of Guanine is 80 %
In a 1000 basepairs (2000 bases) long DNA adenine is 200 molecules and Guanine is 800 molecules. Similarly Thymine is 200 and Cytosine is 800
2007-12-20 12:47:13 · answer #1 · answered by Anonymous · 1⤊ 0⤋
adenine base pairs with thymine
cytosine base pairs with guanine
Your DNA molecule is 1000 base pairs long but is a duplex so in total there will be 2000 bases.
so if 20% of the bases are adenine then 20% must also be thymine
that leaves 60% - so 30% for cytosine and 30% for guanine. As 30% of 2000 is 600 there will be 3600 guanine bases.
2007-12-20 10:25:22 · answer #2 · answered by Anonymous · 0⤊ 1⤋
Amount of adenine = the amount of thymine.
The amount of cytosine = the amount of guanine.
20% of the molecules are adenines, so 20% of the molecules are matching thymines. = 40% total.
That leaves 60% for the cytosine - guanine pairs. 60% of 1000 = 600. Since each cytosine-guanine or guanine-cytosine pair has one guanine, then out of a DNA molecule that is 1000 base pairs long, 600 guanines would be present.
2007-12-20 10:23:55 · answer #3 · answered by ecolink 7 · 1⤊ 0⤋
If 20% are adenines, since A binds to T, 20% must be thymines. That leaves 60% Cs and Gs. Since they also must be present in equal amounts since they bind to each other, its 30%.
EDIT! Its 1000 base pairs long - but there are 2 strands as the last guy pointed out, so theres 2000 bases in total. 30% of 2000 is 600!
2007-12-20 10:24:51 · answer #4 · answered by Meta 3 · 0⤊ 0⤋
20% of the bases are adenines so 20% are thymines
so 60% are guanine and cytosine.
half are each, so 30% are guanine.
30% of 1000 is 300 guanines
2007-12-20 10:22:54 · answer #5 · answered by mountainpenguin 4 · 0⤊ 1⤋
Nucleotides are organic and organic compounds that encompass 3 joined platforms: a nitrogenous base, a sugar, and a phosphate team. the most uncomplicated nucleotides will be divided into 2 communities (purines and pyrimidines) depending on the variety of the nitrogenous base. Nucleotides will be synthesized with both purine and pyrimidine as bases. In DNA, the purine bases are adenine and guanine, at the same time as the pyrimidines are thymine and cytosine. desire this helps - i do not take biology so sorry if it is incorrect
2016-10-19 21:31:57 · answer #6 · answered by ? 4 · 0⤊ 0⤋