The similarity between DNA and RNA is that both

  1. are double standed
  2. have similar sugars
  3. are polymers of nucleotides
  4. have similar pyrimidines

Answer (Detailed Solution Below)

Option 3 : are polymers of nucleotides
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Explanation:

Similarities between DNA & RNA are:

  • Both DNA and RNA are genetic material.
  • DNA and RNA are both large biological polymers of nucleotides.
  • Both DNA and RNA consist of sugar, nitrogenous bases, and a phosphate backbone.
  • On both DNA & RNA Guanine & Cytosine are complementary to each other i.e. they form pair
  • Complementary base pairs are connected by hydrogen bonding. Two hydrogen bonds form between adenine and either thymine or uracil, while three hydrogen bonds form between cytosine and guanine.

Additional Information 

Difference between DNA and RNA-

DNA RNA
It is a long polymer. It has a deoxyribose and phosphate backbone having four distinct bases: thymine, adenine, cytosine, and guanine. Is a polymer with a ribose and phosphate backbone with four varying bases: uracil, cytosine, adenine, and guanine.
It is located in the nucleus of a cell and in the mitochondria. It is found in the cytoplasm, nucleus, and in the ribosome.
It has 2-deoxyribose. It has Ribose.
DNA is functional in the transmission of genetic information. It forms a media for long-term storage. RNA is functional is the transmission of the genetic code that is necessary for the protein creation from the nucleus to the ribosome.
The DNA is a double-stranded molecule that has a long chain of nucleotides. The RNA is a single-stranded molecule that has a shorter chain of nucleotides.
DNA replicates on its own, it is self-replicating. RNA does not replicate on its own. It is synthesized from DNA when required.
The base pairing is as follows: GC(Guanine pairs with Cytosine) A-T(Adenine pairs with Thymine). The base pairing is as follows: GC(Guanine pairs with Cytosine) A-U(Adenine pairs with Uracil).
 
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