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Write a short note on nitrogenous bases....

Write a short note on nitrogenous bases.

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Nitrogenous bases are heterocyclic compounds in which the rings contain both nitrogen and carbon atoms. There are two types of nitrogenous bases
(i) Purines (with double rings) adenine and guanine
(ii) Pyrimidines (with single ring) cytosine, uracil and thymine.
Out of the pyrimidines, cytosine is common for both DNA and RNA while thymine is present only in DNA. Uracil is present in RNA in place of thymine.
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ARIHANT PUBLICATION-MOLECULAR BASIS OF INHERITANCE-PART I (QUESTIONS FOR PRACTICE) (Short Answer Type Questions)
  1. Write a short note on nitrogenous bases.

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  2. If adouble-stranded DNA has 20% of cytosine, calculate the percentage ...

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  3. The base sequence in one of the strands of DNA is TAGCATGAT. (i) Give...

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  4. A DNA segment has a total of 1000 nucleotides, out ofwhich240 of them ...

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  5. It is established that RNA is the first genetic material. Explain givi...

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  6. Write short note on RNA.

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  7. Write a short note on tRNA

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  8. Explain the two factors responsible for conferring stability to double...

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  9. Which property of DNA double helix led Watson and Crick to hypothesise...

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  10. Name a few enzymes involved in DNA replication other than DNA polymera...

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  11. State the dual role of deoxyribonucleoside triphosphates during DNA re...

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  12. Why do you see two different types of replicating strands in the given...

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  13. Write a short note on central dogma.

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  14. Explain transcription ?

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  15. Describe the initiation process of transcription in bacteria

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  16. Explain {in one or two lines) the function of the following (i) Intr...

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  17. State the difference between the structural' genes in a transcription ...

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  18. Depending upon the chemical nature of the template (DNA or RNA) and th...

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  19. Why hnRNA is required to undergo splicing?

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