Lac operon concept in Escherichia coli was proposed in 1961 by :
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    Molecular Basis of Inheritance

    Multiple Choice QuestionsMultiple Choice Questions

    101. Central dogma of cytogenetics is :
    • RNA → DNA → Protein
    • DNA → RNA → Protein
    • Protein → RNA → DNA
    • DNA → RNA → Protein → DNA.
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    102. Lac operon concept in Escherichia coli was proposed in 1961 by :
    • Meselson and Stahl
    • Jacob and Monod
    • Watson and Crick
    • H.G. Khorana.

    B.

    Jacob and Monod
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    103. In E. coli, during lactose metabolism repressor binds to :
    • Regulator gene
    • Promoter gene
    • Operator gene
    • Structural gene.
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    104. DNA copies itself by the process of :
    • Translation
    • Transcription
    • Replication
    • Both (A) and (B).
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    105. Which of the following is specifically used in genetic engineering ?
    • polymerase
    • Gyrase
    • Restriction endonuclease
    • DNAse.
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    106. How many codons code for amino acids ?
    • 64
    • 61
    • 68
    • 60
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    107. In DNA guamine and cytosine in bonded with how many hydrogen bonds ?
    • 1
    • 2
    • 3
    • 4
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    108. Out of 64 codons how many codons donot code for any amine acid ?
    • 62
    • 61
    • 3
    • 1
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    109. Which of the following can mutate ?
    • RNA
    • DNA
    • Both (A) and (B)
    • All of above
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    110. Codon is present on :
    • mRNA
    • tRNA
    • protein
    • rRNA
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