A portion of DNA molecules wound around a spool of histone protein is called a
A. Centromere
B. Nuclesome
C. Spindle
D. Furrow
E. Cell Cycle
The correct answer is B. Nucleosome.
To arrive at this answer, we can break down the question and analyze the options given. The question asks for a term that describes a portion of DNA molecules wound around a spool of histone protein.
Let's look at the options:
A. Centromere: The centromere is a specific region of a chromosome that holds sister chromatids together. It is not the term we are looking for in this case.
B. Nucleosome: Nucleosomes are structural units of DNA formed by the coiling of DNA strands around a core of histone proteins. This matches the description given in the question, so it is a potential correct answer.
C. Spindle: The spindle is a structure formed in cells during cell division, and it is involved in pulling apart sister chromatids. It does not match the description given, so it is not the correct answer.
D. Furrow: A furrow refers to the indentation or groove that forms during cytokinesis in animal cells. It is not related to the description of DNA molecules wound around histone proteins.
E. Cell Cycle: The cell cycle is the series of events that a cell undergoes as it grows and divides. It is not the term we are looking for in this case.
By process of elimination, we can conclude that the correct answer is B. Nucleosome, as it matches the description provided in the question.