Question

The following pairing of DNA nucleotides is correct, except ___________.

		Adenine with thymine
		Cytosine with guanine
		Purine with pyrimidine
		Guanine with adenine

DNA nucleotides with one-carbon nitrogen ring bases are called ________.

		adenines
		purines
		pyrimidines
		guanine

The nucleotides of DNA are held together by ___________.

		ionic bond
		hydrogen bond
		phosphodiester bond
		sugar-phosphate backb

Basic structure of nucleotide includes the following type(s) of chemical components.

		Phosphate group
		Deoxyribose sugar
		Nitrogenous base
		All of the above

Answer 1

Answer – (d) Guanine and adenine are an incorrect pair, as the pairing of nucleotides occur between a purine and pyrimidine which occur as adenine(A) with thymine(T) and cytosine (c) with guanine(G).

Answer – (c ) DNA nucleotides with one carbon nitrogen ring bases are called pyrimidines while the two carbon nitrogen ring is purines which includes adenines and guanine.

Answer – (b) Nucleotides of the DNA are held together by hydrogen bond.

Answer –(d) Basic structure of nucleotides includes the following types of chemical component which are phosphate group, deoxyribose group in case of DNA , nitrogenous base ( cytosine (C), guanine (G), adenine (A) or thymine (T) or Uracil (U) in case of RNA.

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