277984
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it ?
1 Adenine, thymine - Purines
2 Thymine, uracil - Pyrimidines
3 Uracil, cytosine - Pyrimidines
4 Guanine, adenine - Purines
Explanation:
(a) Adenine is purine while thymine is pyrimidine.
NCERT Page-149 / N-111
BIOMOLECULES(NCERT)
277985
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
1 Base-sugar-OH
2 Base-sugar-phosphate
3 Sugar-phosphate
4 Base-sugar-acid
Explanation:
(b) The heterocyclic compounds in nucleic acids are the nitrogenous bases named adenine, guanine, uracil, cytosine, and thymine. Adenine and Guanine are substituted purines while the rest are substituted pyrimidines. The skeletal heterocyclic ring is called as purine and pyrimidine respectively. The sugar found in polynucleotides is either ribose (a monosaccharide pentose) or 2' deoxyribose. A nucleic acid containing deoxyribose is called deoxyribonucleic acid (DNA) while that which contains ribose is called ribonucleic acid (RNA).
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BIOMOLECULES(NCERT)
277984
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it ?
1 Adenine, thymine - Purines
2 Thymine, uracil - Pyrimidines
3 Uracil, cytosine - Pyrimidines
4 Guanine, adenine - Purines
Explanation:
(a) Adenine is purine while thymine is pyrimidine.
NCERT Page-149 / N-111
BIOMOLECULES(NCERT)
277985
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
1 Base-sugar-OH
2 Base-sugar-phosphate
3 Sugar-phosphate
4 Base-sugar-acid
Explanation:
(b) The heterocyclic compounds in nucleic acids are the nitrogenous bases named adenine, guanine, uracil, cytosine, and thymine. Adenine and Guanine are substituted purines while the rest are substituted pyrimidines. The skeletal heterocyclic ring is called as purine and pyrimidine respectively. The sugar found in polynucleotides is either ribose (a monosaccharide pentose) or 2' deoxyribose. A nucleic acid containing deoxyribose is called deoxyribonucleic acid (DNA) while that which contains ribose is called ribonucleic acid (RNA).