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Which one the following pairs of nitrog...

Which one the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

A

Thymine, Uracil - Pyrimidines

B

Uracil, Cytosine - Pyrimidines

C

Guanine, Adenine - Purines

D

Adenine, Thymine - Purines

Text Solution

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The correct Answer is:
D
DNA and RNA the principal genetic materials of living organisms are chemically called nucleic acids. These are polymers of nucleotides. Each nucleotide is composed of phosphoric acid, pentose sugar and nitrogenous base. The nitrogenous bases are of two types, i.e. purine and pyrimidines. Purines are heterocyclic and two rings, e.g. adenine, guanine.
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NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-BIOMOLECULES-EXERCISE
  1. Which one of the following pairs is wrongly matched

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  2. In the DNA molecule

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  3. Which one the following pairs of nitrogenous bases of nucleic acids, ...

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  4. Modern detergents contain enzyme preparations of

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  5. A competitive inhibitor of succinic dehydrogenase is

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  6. Which one of the following is not a constituent of cell membrane

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  7. The two polynucleotide chains in DNA are

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  8. About 98 percent of the mass of every living organism is composed of j...

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  9. One turn of the helix in a B- from DNA is approximately

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  10. Antibodies in our body are complex

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  11. Antiparallel strands of a DNA molecule means that :

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  12. An organic substance bound to and enzyme and essential for its activit...

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  13. An enzyme that can stimulate germination of barley seeds is

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  14. Nucleotides are building blocks of nucleic acids. Each nucleotide is a...

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  15. Which of the following is the simplest amino acid

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  16. Which one of the following hydrolyses internal phosphodiester, bonds i...

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  17. Which one of the following statements regarding enzyme inhibition is c...

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  18. Enzymes, vitamines and hormones can be classified into a single catego...

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  19. The catalytic efficiency of two different enzymes can be compared by t...

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  20. The most abundant element present in the plants is Or Which of th...

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