(a) Why is DNA molecule more stable genetic material than RNA ? E
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    Molecular Basis of Inheritance

    Multiple Choice QuestionsLong Answer Type

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    91. (a) Why is DNA molecule more stable genetic material than RNA ? Explain.

    (b)‘Unambigous’, ‘degenerate’ and ‘universal’ are some of the salient features of genetic code. Explain.

    (a) DNA is more stable as it lacks the highly reactive 2'-OH species and it has thymine which is more stable than uracil found in RNA.

    (b)The terms used in genetic code means  

    Unambiguous means that each codon codes for only one amino acid.

    Degenerate means that one amino acid can be coded by mopre than one codon.

    Universal means that a given codon in DNA and mRNA specifies the same amino acid in all organisms from viruses, bacteria to human beings.

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    92.

    Provide experimental evidence for semi-conservative mode of replication of DNA.

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    93.

    Describe various goals of human genome project (HGP).

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    Multiple Choice QuestionsMultiple Choice Questions

    94. Start codon is  :
    • AAG
    • AUG
    • GAG
    • GUC
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    95. Experimental material in the study of DNA replication has been available in the organism :
    • Escherichia coli
    • Neurospora crassa
    • Pneumococcus
    • Drosophila melanogaster.
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    96. Nucleotide arrangement in DNA can be seen by :
    • X-ray crystallography
    • Electron microscope
    • Ultracentrifuge 
    • Light microscope.
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    97. Pneumococcus experiment proved that :
    • Bacteria do not reproduce asexually
    • Bacteria undergo binary fission
    • DNA is genetic material
    • RNA may sometimes control production of DNA and proteins.
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    98. Which one of the following triplet codes is correctly matched  ?
    • UUU–Methionine
    • UGU–Start
    • AUG–Methionine
    • UCG–Start.
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    99. The total number of nitrogenous bases in human genome is estimated to be about :
    • 3.5 million
    • 35 thousand
    • 35 thousand
    • 3 billion.
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    100. Which of the following pairs is correctly matched with regard to the codon and the amino acid coded by it ?
    • UGG – Tryptophan
    • AAA – Trytophan
    • AUG- Cysteine
    • CCC – Methionine
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