2006-11-19 06:19:59 · 4 answers · asked by rnjes21 2 in Science & Mathematics ➔ Biology
we know that Adenine and Thymine pair together in DNA and Cytosine and Guanine pair together. Therefore the amount of A = T and the amount of C = G, so:
A = T = 20%
C = G = ?
A + T + C + G = 100%
20% + 20% + 2x = 100%
2x = 100% - 40% = 60%
x = 30%
C = G = 30%
2006-11-19 06:26:33 · answer #1 · answered by smarties 6 · 1⤊ 0⤋
DNA is composed of A,T,C, and G. Uracil is only in RNA (substitutes thymine during the transcription process), so we know right off the bat there is no U (0%).
A always always bonds with T. Therefore, how many T bases are there if you know how many A bases there are? The same number! (20% T)
The only remaining bases are C and G, so together they must make up the next 60% of the molecule. They must make up equal parts of the molecule. Its like asking how many boys and girls came to a dance if you know how many couples came and that every couple was man and woman. So, if you have 60% of the remaining bases as C and G, 30% must be C and 30% must be G. Now 30%+30%+20%+20%=100%, so we know we did our work right.
2006-11-19 06:30:13 · answer #2 · answered by Wise1 3 · 1⤊ 0⤋
Thymine: 20%
Cytosine: 30%
Guanine: 30%
Uracil: negligible
... I think
2006-11-19 06:28:52 · answer #3 · answered by andrew w 1 · 1⤊ 0⤋
thymine is 20
cytosine 30
guanine 30
uracil 0
2016-03-12 02:21:55 · answer #4 · answered by Elsa 1 · 1⤊ 0⤋