Distinguish between heterochromatin and euchromatin. Which of the two is transcription-ally active ?

What would happen if histones were to be mutated and made rich in acidic amino acids such as aspartic acid and glutamic acid in place of basic amino acids such as lysine and arginine?

Read the following statements and choose the set of correct statements:

$(a)$ Euchromatin is loosely packed chromatin

$(b)$ Heterochromatin is transcriptionally active

$(c)$ Histone octomer is wrapped by negatively charged DNA in nucleosome

$(d)$ Histones are rich in lysine and arginine

$(e)$ A typical nucleosome contains $400\,bp$ of DNA helix

Choose the correct answer from the options given below:

Adenine is $30\%$ then what would be the $\%$ of guanine