Which of the following is incorrect?

Question

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Answer 1

Correct Answer: D
Explanation:

Nucleic acids are long-chain polymers of nucleotides. Nucleotides are phosphoric acid esters of nucleosides.
Nucleosides are made by the formation of a glycosidic 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 are 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.

Answer 2

Correct Answer: D

Explanation:

Nucleic acids are long-chain polymers of nucleotides. Nucleotides are phosphoric acid esters of nucleosides.
Nucleosides are made by the formation of a glycosidic 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 are 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.