Read the following statements and choose the set of correct statements:(a) Euchromatin is loosely packed chromatin(b) Heterochromatin is transcriptionally active(c) Histone octamer is wrapped by negatively charged DNA in nucleosome(d) Histones are rich in lysine and arginine.(e) A typical nucleosome contains bp of DNA helixChoose the correct answer from the options given below:
- A(b), (d), (e) Only
- B(a), (c), (d) Only
- C(b), (e) Only
- D(a), (c), (e) Only
Solution & Step-by-step Explanation
(a) is correct: Euchromatin is loose and stains light.(b) is incorrect: Heterochromatin is dense and transcriptionally inactive.(c) is correct: DNA is negative (phosphate) and histones are positive.(d) is correct: Basic amino acids (Lys, Arg) provide the positive charge.(e) is incorrect: A typical nucleosome contains approximately bp of DNA.Correct statements are (a), (c), and (d).