In sea Urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are:

G 34%, A 24.5%, T 24.5%

G 17%, A 16.5%, T 32.5%

G 17%, A 33%, T 33%

G 8.5%, A 50%, T 24.5%

Solution

G 17%, A 33%, T 33%

Charagaff's rule states that purine and pyrimidine base paires are present in equal amount, i.e.
A = T, G = C
(A + T) = (G + C)
$therefore space space space space fraction numerator straight A plus straight T over denominator straight G plus straight C end fraction space equals space 1$
Cytosine = 17%
If A+G+C+T = 100 and G = C, A = T then
A+17+7+T = 100
$therefore$ G = 17%
A + T + 34 = 100
A + T = 100 - 34
A + T = 66
A = T = 33% = 66
Hence, if cytosine is 17%, then G = 17% A and T will be 33% each.

Some More Questions From Molecular Basis of Inheritance Chapter

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Molecular Basis Of Inheritance

In sea Urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are:

G 34%, A 24.5%, T 24.5%

G 17%, A 16.5%, T 32.5%

G 17%, A 33%, T 33%

G 8.5%, A 50%, T 24.5%

Some More Questions From Molecular Basis of Inheritance Chapter

Suggest one evidence to prove that RNA was first genetic material.

Why was RNA unstable ?

What made DNA more preferrable as genetic material ?

Process of replication is completed in how much time in E.coli ?

What is average rate of polymerization ?

List three components of transcription unit.

Which RNA acts as an adapter ?

Name three kinds of polymerases.

What is splicing ?

Which is more stable DNA or RNA?

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For Daily Free Study Material Join wiredfaculty

Molecular Basis Of Inheritance

In sea Urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are: G 34%, A 24.5%, T 24.5% G 17%, A 16.5%, T 32.5% G 17%, A 33%, T 33% G 8.5%, A 50%, T 24.5%

Some More Questions From Molecular Basis of Inheritance Chapter

Suggest one evidence to prove that RNA was first genetic material.

Why was RNA unstable ?

What made DNA more preferrable as genetic material ?

Process of replication is completed in how much time in E.coli ?

What is average rate of polymerization ?

List three components of transcription unit.

Which RNA acts as an adapter ?

Name three kinds of polymerases.

What is splicing ?

Which is more stable DNA or RNA?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

In sea Urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are:

G 34%, A 24.5%, T 24.5%

G 17%, A 16.5%, T 32.5%

G 17%, A 33%, T 33%

G 8.5%, A 50%, T 24.5%