Revising DNA - Grade 12 - Paper 2 - NSC Exam Prep

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  • เผยแพร่เมื่อ 17 พ.ย. 2024

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  • @Inamandla-q2w
    @Inamandla-q2w วันที่ผ่านมา +1

    Thank you sir❤

  • @lifeasmbali9606
    @lifeasmbali9606 วันที่ผ่านมา

    isn’t 2.1.2 supposed to be AGT? 6:22

    • @lifeasmbali9606
      @lifeasmbali9606 วันที่ผ่านมา

      as well as 2.1.3 b) isn’t it supposed to be CAT? or are we supposed to change it twice? from trna to mrna to dna? 11:47

    • @MrParkerGr11-12
      @MrParkerGr11-12  วันที่ผ่านมา

      For 2.1.2 the answer is TCA since the nitrogenous based given is found on tRNA. So yes, it must be changed twice to get the DNA base triplet

    • @MrParkerGr11-12
      @MrParkerGr11-12  วันที่ผ่านมา

      ⁠@@lifeasmbali9606at 11.47 the answer for 2.1.4 (b) is CCU since you change it from GGA (only change it once since you going from mRNA to tRNA).
      Hope that this makes sense and that it’s clear?

    • @lifeasmbali9606
      @lifeasmbali9606 วันที่ผ่านมา +1

      @@MrParkerGr11-12i was talking about 2.1.3 b) but i see that you have to change it twice. thank you

    • @leratosefatsa3783
      @leratosefatsa3783 วันที่ผ่านมา

      Plz explain 2.1.4 (b).........I don't seem to understand

  • @MpilonhleMpanza-t5m
    @MpilonhleMpanza-t5m วันที่ผ่านมา

    Sir question 2.1.4 is more complicated 🙏🙏
    There are so many changes that cause confusion even though i have a little bit understanding
    About Effect on protein formed

    • @MrParkerGr11-12
      @MrParkerGr11-12  วันที่ผ่านมา

      Try to remember the order in which the changes occur: if DNA base triplet changes, then mRNA codon changes, tRNA anti-codon changes, which then changes the amino acid, and results in a different protein being formed.

    • @MpilonhleMpanza-t5m
      @MpilonhleMpanza-t5m วันที่ผ่านมา

      ​@@MrParkerGr11-12
      I understand that basic sir but am confused.
      The DNA nitrogenous sequence coded for mRNA
      Changed the first T By G And C by A,
      That leads to CUA mRNA and UCC.
      Why do we not using the changed DNA nitrogenous sequence for the change of anticodon
      Because I saw you sir using TAT changed to UAU
      My confusion is here actually
      🙏🙏🙏

    • @MrParkerGr11-12
      @MrParkerGr11-12  วันที่ผ่านมา

      @@MpilonhleMpanza-t5mit would not be incorrect to mention the changed DNA sequence in your explanation. The reason why the focus is on the mRNA codon changes is due the fact that the mRNA codon is needed for the tRNA anticodon. That is why the changed mRNA codons are mentioned in the explanation

    • @MpilonhleMpanza-t5m
      @MpilonhleMpanza-t5m วันที่ผ่านมา +1

      ​@@MrParkerGr11-12
      I thank very much sir
      Everything is clear I got this
      I hope I will write fantastic on the next day

    • @MrParkerGr11-12
      @MrParkerGr11-12  วันที่ผ่านมา

      @@MpilonhleMpanza-t5m It’s a pleasure. I wish you all the best for your last Life Sciences exam 💯