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Question

Which of the following is incorrect?
  1. Sugar is covalently bonded to nitrogenous base
  2. Phosphate is covalently bonded to nitrogenous base
  3. Sugar and nitrogenous bases from peptide bonds
  4. Nitrogenous bases are hydrogen bonded to each other

A
Phosphate is covalently bonded to nitrogenous base
B
Sugar is covalently bonded to nitrogenous base
C
Nitrogenous bases are hydrogen bonded to each other
D
Sugar and nitrogenous bases from peptide bonds
Solution
Verified by Toppr

Nucleic acids are long chain polymers of nucleotides. Nucleotides are phosphoric acid esters of nucleosides. Nucleosides are formed by formation of a glycodsidic bond between nitrogenous bases and pentose sugars. All of the bonds in a single chain of nucleotides are covalent bonds. In DNA, two chains of nucleotides associated together by hydrogen bonds between nitrogen bases. Adenine forms two hydrogen bonds with thymine and guanine forms three hydrogen bonds with cytosine. Proteins are made up of multiple peptide chains. Peptides are polymers made up of amino acids. In a peptide chain, amino acids are joined together by peptide bonds.
So, the correct answer is option D.

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