Which sentence best defines nucleosomes?

• A. Nucleosomes are segments of RNA that code for proteins.
• B. Nucleosomes are enzymes that replicate DNA during cell division.
• C. Nucleosomes are membrane-bound organelles that store genetic material.
• D. Nucleosomes are complexes of DNA wrapped around histone proteins that help package DNA into chromatin.

Answer: (D)

Verified step by step guidance

1. Understand that nucleosomes are structural units within the cell nucleus related to DNA packaging.
2. Recall that DNA in eukaryotic cells is wrapped around proteins called histones to form nucleosomes.
3. Recognize that nucleosomes help organize and compact DNA into a dense structure called chromatin.
4. Eliminate incorrect options: nucleosomes are not RNA segments, enzymes, or membrane-bound organelles.
5. Conclude that the best definition is that nucleosomes are complexes of DNA wrapped around histone proteins that help package DNA into chromatin.