Answer: Two molecules of H2A
Explanation:
Structural organization of nucleosomes were determined by isolating them from unfolded chromatin and it has been found that the basic units of chromatin are the nucleosomes which consist of histone octamers of two molecule each of histone H2A and other histone molecules like H2B, H3 and H4. The histones are wrapped around with 147bp of DNA in almost two (2) turns.
New varieties. Natural selection and selective breeding can both cause changes in animals and plants. The difference between the two is that natural selection happens naturally, but selective breeding only occurs when humans intervene. For this reason selective breeding is sometimes called artificial selection.
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Answer:
Explanation:
A root has an outside layer, the epidermis, and a central cylinder of a vascular tissue. Between these two tissues lies a large area of ground tissue.
When receiving x rays, individuals wear a lead<span>shield over major organs in order to limit the
body’s exposure to radiation. One reason for this
procedure is to </span><span>prevent mutations in gametes</span>
