Read the following statements and choose the | vedclass

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(A) Statement $(a)$ is correct: Euchromatin is loosely packed and stains lightly.Statement $(b)$ is incorrect: Heterochromatin is densely packed and t

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$(a), (c), (d)$ Only

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(A) Statement $(a)$ is correct: Euchromatin is loosely packed and stains lightly.Statement $(b)$ is incorrect: Heterochromatin is densely packed and transcriptionally inactive,whereas euchromatin is transcriptionally active.Statement $(c)$ is correct: The negatively charged $DNA$ is wrapped around the positively charged histone octamer to form a nucleosome.Statement $(d)$ is correct: Histone proteins are basic proteins rich in the basic amino acids lysine and arginine.Statement $(e)$ is incorrect: $A$ typical nucleosome contains $200 \ bp$ of $DNA$ helix,not $400 \ bp$.Therefore,the correct statements are $(a), (c),$ and $(d)$.

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