Which of the statements about nucleosomes are correct?

a. most histones are large (more than 250 amino acid residues), acidic proteins rich in lys and arg.

b. degradation of linker dna yields dna fragments of about 200 bp.

c. dna binding to histones enables overall positive supercoiling without enzymes that underwind the dna helix.

d. partial enzymatic digestion of chromatin results in dna fragments of about the histones h2a, h2b, h3, and h4 make up the nucleosome octamer that binds dna.

e. histone proteins are positioned on dna, in part, based on the abundance of clusters of base pairs in dna.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.