Answer :
RNA polymerase will attach to the letter A which marks the structure of the filament.
The letter A indicated the DNA helix. The DNA helix bonds will be opened by the enzyme RNA polymerase and the breakdown of genetic information from DNA is formed. The place where RNA polymerase attaches to DNA is called the promoter.
The promoter contains the DNA sequence that allows the RNA polymerase or its helper proteins to attach to the DNA. RNA polymerase catalyzes the formation of phosphodiester bonds which link nucleotides together to form linear chains.
The letter C denotes a subunit of the globule indicating histones. Histones are proteins found in the nucleus of eukaryotic cells that are covered in DNA, which together with DNA form the structure of the nucleosome. The letter B is a collection of histone proteins or one globule consisting of histones H1, H2A, H2B, H3, and H4.
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