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DNA

The proportio...

Question

The proportion of nucleotides in agiven nucleic acid are : Adenine $18 %$ , Guanine $30 %$ , Cytosine $42 %$ and Uracil $1 %$ . Name the uncleic acid and mention the number of strands in it.

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Solution

In the given nucleic acid, 18% adenines, 30% guanines, 42% cytosines, 1% Uracil are present. By the presence of Uracil, we can conclude that the nucleic acid is Ribonucleic acid(RNA) and the number of strands present in RNA is one.

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Q. The proportion of nucleotides in a given acid are : adenine 18%, Guanine 30%, Cytosine42 % and Uracil 10 %. Name the nucleic acid and mention the number of strands in it.

Q. Assertion :The heterocyclic compounds in nucleic acid are the nitrogenous bases. Reason: Adenine and guanine are substituted pyrimidines while uracil, cytosine and thymine are substituted purines.

Q. While analysing the DNA of an organism, a total number of 5386 nucleotides were found, out of which the proportion of different bases were adenine = 18 %, guanine = 32 %, cytosine = 32 % and thymine = 18 %. Considering the Chargaff’s rule, it can be concluded that

Statement 1: There are four kinds of nitrogen bases in DNA.

Statement 2: They are adenine, uracil, guanine and cytosine.

Consider the following DNA nucleotides, where A, C, G, and T represent adenine, cytosine, guanine, and thymine:
TAC TTT TTG CTC ATC

Choose the correct order of coded amino acids.

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