What makes up the protein component of a nucleosome core?

a. Histone H1 protein

b. Two tetramers of histone proteins

c. One tetramer of histone proteins

d. Eight different histone proteins

The correct answer is b. Two tetramers of histone proteins.

Explanation:

Nucleosomes are made of eight histones, that can be divided into two tetramers. The first one is made of H3 and H4 histones, forming a dimer and the second one is made of H2A and H2B histones forming another dimer. Two dimers of each one are then linked, forming tetramers and finally, when these two are formed, they bind so that way they form the octamer.