The first level of DNA packing in a eukaryotic nucleus involves DNA winding around specific proteins to form structural units. What are these proteins and units called?
ADNA winds around ribosomal proteins to form spliceosome complexes
BDNA winds around transcription factors to form operon complexes
CDNA winds around histone proteins to form nucleosome complexes
DDNA winds around tubulin proteins to form centromere complexes
Answer & Solution
Correct answer: C. DNA winds around histone proteins to form nucleosome complexes
1. The first level of DNA packing in the nucleus is the winding of DNA strands around histone proteins.
2. Histones package and order DNA into structural units called nucleosome complexes.
3. These nucleosomes can control the access of proteins to the underlying DNA regions.
4. Ribosomal proteins, transcription factors, and tubulin are not the proteins described as forming this first level of DNA packing.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 16 "Gene Expression", section Epigenetic Control_
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