Q4 Nucleosome is the basic unit of chromatin structure. please describe (1) the structure/composition of nucleosome (2) the enzyme and experiment that were used in the 1970s to uncover such a fact (20 points) Q5.(1)Is all dNa sequence in euchromatin transcriptionally active (2 )which enzyme can be used to determine the transcriptionally active dna regions, and how? (3)By what means does the cell maintain the transcriptioanlly active dna regions be free of extensive chromosomal packing(20 points)Q4. Nucleosome is the basic unit of chromatin structure, please describe (1) the structure/composition of nucleosome (2) the enzyme and experiment that were used in the 1970s to uncover such a fact. (20 points) Q5. (1) Is all DNA sequence in euchromatin transcriptionally active? (2) which enzyme can be used to determine the transcriptionally active DNA regions, and how? (3) By what means does the cell maintain the transcriptioanlly active DNA regions be free of extensive chromosomal packing. (20 points)