Which of the following statements is incorrect?

  • A
    $DNA$ is chemically less reactive than $RNA$.
  • B
    $RNA$ exhibits faster mutation rates compared to $DNA$.
  • C
    Guanylyl transferase enzyme assists in capping during $hn-RNA$ splicing.
  • D
    The sweetness index of saccharin is $10,000$.

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Which of the following is an incorrect combination?

Explain the Central Dogma in molecular biology.

How many of the given statements $(i-iv)$ is/are correct?
$i.$ In transcription,adenosine pairs with uracil.
$ii.$ Regulation of lac operon by repressor is referred to as positive regulation.
$iii.$ The human genome has approximately $50,000$ genes.
$iv.$ Haemophilia is a sex-linked recessive disease.

The given figure shows the structure of a nucleosome with its parts labelled as $A, B$ and $C$. Identify $A, B$ and $C$.

By using the diagram,select the correct option for $X$ and $Y$.

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