Nucleosomes a. promote the formation of either euchromatin or heterochromatin. b

Question

Nucleosomes a. promote the formation of either euchromatin or heterochromatin. b. are the regions of the nucleus occupied by a particular chromosome. c. are located at centromeres. d. are darkly stained regions of compacted chromosomes (heterochromatin) that have been stained with Giemsa. e. are complexes containing two H2A/H2B dimers and two H3/H4 dimers, around which 146 bp of DNA are wrapped. f. are the relatively less condensed regions of chromosomes. g. are the regions of a bacterial cell that contains the bacterial chromosome.

Explanation / Answer

E. are complexes containing two H2A/H2B dimers and two H3/H4 dimers, around which 146 bp of DNA are wrapped. The core histone proteins contain a characteristic structural motif termed the "histone fold," which consists of three alpha-helices (?1-3) separated by two loops (L1-2). histones form H2A-H2B heterodimers and H3-H4 heterotetramers.

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