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B
mRNA
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C
rRNA
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D
snRNA
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E
tRNA
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Solution
The correct option is A DNA The DNA in genes is organized as nucleosomes. Nucleosomes are fundamental organizational units of chromatin which appear as “beads-on-a-string” arrangement. Here, beads represent complexes of histones and DNA. The bead plus linker DNA leads to the next bead and form the nucleosomes. Each bead contains eight histone molecules: two copies each of H2A, H2B, H3, and H4. Each bead of nucleosome has 200 bp of DNA which is wound 1.65 times around histone octamer.