Which statement is true about the nitrogen bases in dna and rna?
a. uracil is found in rna only. thymine is found in dna only.
b. thymine is found in rna only. uracil is found in dna only.
c. uracil is found in rna only. guanine is found in dna only.
d. adenine is found in rna only. thymine is found in dna only.

The answer is A. Uracil is found in RNA only

Answer;

A. Uracil is found in RNA only. Thymine is found in DNA only.

Explanation;Both DNA  and RNA are types of nucleic acids, whose building blocks are nucleotides. The two nucleic acids have got similarities and also differ structurally in a number of ways.They are both made up of nucleotides which are the building blocks.DNA is double stranded while RNA is single stranded.In terms of nucleotides composition; RNA contains a nucleotide uracil (U) in place of Thymine (T) in the DNA.DNA is only found in the nucleus while RNA is found in the cytoplasm and also in the ribosomes where proteins are synthesized.