Question

Similarity between DNA and RNA is that both have
A. Similar sugars
B. Similar mode of replication
C. Similar pyrimidines
D. Polymers of nucleotides

Answer 1

Both DNA and RNA are made of nucleotides and each one contains a 5-carbon sugar, phosphate group, and nucleobases (nitrogenous bases). DNA and RNA are very similar molecules that serve very different functions.

Complete answer:

Although both nucleic acids are almost similar, the DNA is made up of the deoxyribose sugar while the RNA is made up of the ribose sugar only. Hence, option A is incorrect.
The DNA is synthesised by an enzyme DNA polymerase during the process of replication while the RNA is synthesised by an enzyme RNA polymerase during transcription. Hence, option B is also incorrect.
The purines in DNA are adenine and guanine, the same as in RNA. The pyrimidines in DNA are cytosine and thymine; in RNA, they are cytosine and uracil. Hence, option C is also incorrect.
DNA and RNA are the polymers of nucleotides which are made up of sugar, the nitrogenous base and phosphoric acid. Hence, option D is also incorrect.

Additional information: DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are very similar molecules that serve very different functions. DNA is responsible for long term storage of the genetic code. It resides in the nucleus of eukaryotic cells. RNA, on the other hand, is responsible for several important processes including transporting the genetic information found in DNA to other sites in the cell where it can be used to make proteins.

So, the correct answer is option (D) i.e., Polymers of nucleotides.

Note: The DNA is a double-stranded molecule made up of two polynucleotide chains while the RNA is a single-stranded molecule made up of a single polynucleotide chain.