Which Histone Is Replaced in Nucleosomes Found in the Vicinity

question 21

Multiple Choice

Which histone is replaced in nucleosomes found in the vicinity of centromeres?

• A) histone H1
• B) histones H2A
• C) histone H2B
• D) histone H3
• E) histone H4

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Definitions:

Epigenetic Effect

Changes in gene expression caused by mechanisms other than changes in the DNA sequence, influenced by environmental factors, behaviors, and lifestyle.

Chemical Marks

Biologically significant molecules that attach to DNA or proteins and play a role in gene expression and regulation.

DNA

Deoxyribonucleic acid, a molecule containing the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.

Rooting Reflex

An innate reflex in newborns, where they turn their head toward anything that strokes their cheek or mouth, searching for the object by moving their head in steadily decreasing arcs until the object is found.