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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • What enzymes are known as “molecular scissors” and can cut DNA at specific recognition sequences?

    Question: What enzymes are known as "molecular scissors" and can cut DNA at specific recognition sequences?

    Options:

    Ligase
    Transposase
    Restriction endonuclease
    DNA polymerase

    ✅Explanation:
    Restriction endonucleases are enzymes that act as molecular scissors. They recognize and cut DNA at specific nucleotide sequences, generating fragments with "sticky ends" (complementary overhangs) that can be joined together by other enzymes. These enzymes are crucial tools in genetic engineering and research techniques like DNA cloning.

    📌Other Options:
    Ligase joins DNA fragments
    Transposase moves DNA segments within a genome.
    DNA polymerase builds new DNA strands.

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