Final answer:
The nucleosome core particle is the beadlike structure formed by DNA wrapped around a core of eight histone proteins.
Step-by-step explanation:
The nucleosome core particle can be seen as small beads on a string under an electron microscope. The core particle consists of DNA tightly wrapped around a core of eight histone proteins, forming a structure called a nucleosome complex. The histones form an octamer composed of two molecules of each of four different histones. The nucleosome complexes control access to the DNA regions and are about 10 nm in diameter.