Question

If the dna of a certain organism has guanine as 30% of its bases, then what percentage of its bases are adenine?

Answer 1

G always pairs with C...So, if there is 30% G, then there's 30% C...which is 60%...that leaves 40% A+T - and you have to split this up too - so 20% Thymine (T) and 20% Adenine (A).

Answer 2

If the DNA of a certain organism has guanine as 30% of its bases, then the organism will have 20% Adenine.

DNA COMPOSITION:

• DNA (Deoxyribonucleic acid) is a type of nucleic acid that stores genetic information in living cells.

• DNA is structurally made up of nucleotides, which are four in number namely: adenine (A), guanine (G), thymine (T) and cytosine (C).

• According to Chargaff in his rule, the amount of adenine and thymine in the DNA are equal while the amount of guanine and cytosine are equal. The total sums up to 1 or 100% i.e. (A = T) + (G = C) = 100%

• According to this question, the DNA of a certain organism has guanine as 30% of its bases. This means that the percentage of cytosine bases in the DNA will be 30%.

30 + 30 + A + T = 100

{A = T} = 100 - 60

{A = T} = 40%

A = 40% ÷ 2

A = 20%.

• Therefore, if the DNA of a certain organism has guanine as 30% of its bases, then the organism will have 20% Adenine.

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