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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • The principle enzyme for DNA replication is:

    Question: The principle enzyme for DNA replication is:

    Options:

    DNA ligase
    DNA helicase
    DNA-dependent DNA polymerase
    None of the above

    📌 Concept:
    -DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule.
    -It is an enzymatically governed process, many enzymes participate in DNA replication.

    ✅ Explanation:
    -The principal enzyme for DNA replication is DNA-dependent DNA polymerase
    -DNA replication process uses DNA polymerase III to catalyzes the joining of deoxyribonucleoside 5′-triphosphates (dNTPs) at a growing chain of DNA.
    -DNA is read by DNA polymerase in the 3′ to 5′ direction, meaning the new strand is synthesized in the 5' to 3' direction.
    -In the DNA replication process, one new strand (leading strand) is made as a continuous piece. The other (lagging strand) is made in small pieces.
    -At the leading strand, DNA polymerase III synthesizes the new strand in the 5′ to 3′ direction.
    -The lagging strand is elongated in an antiparallel direction, by the addition of short RNA primers (Okazaki fragment) which are filled with other joining fragments.
    -The Okazaki fragments formed at the lagging strand are joined together by the enzyme DNA ligase, for this reason, DNA ligase is also called molecular glue
    🔴Additional Information:: Other Important Enzyme in DNA Replication DNA Helicase enzyme: Involved in unwinding the double-helix structure of DNA, allowing replication to begin by breaking hydrogen bonds between DNA bases using ATP hydrolysis.
    -Topoisomerase: Resolves topological stress during unwinding by cutting and rejoining DNA strands, allowing them to move around each other to release tension.
    -DNA Primase enzyme: Synthesizes short RNA molecules that serve as templates for initiating DNA replication.
    -DNA Ligase enzyme: Joins DNA fragments together by forming phosphodiester bonds between nucleotides.

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