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While studying the impact of nutrition on intelligence, a researcher has one group of rats on a vitamin-rich diet and the other group eating Big Macs. While observing the rats run a complicated maze, the researcher notes that the vitamin-enhanced rats' maze is more brightly lit than the Big Mac rats' maze. The difference in lighting in this study is a(n) _________.
Nucleosomes
Nucleosomes are the basic structural unit of DNA packaging in eukaryotic cells, composed of a segment of DNA wound around a core of histone proteins.
Histones
Small, positively charged (basic) proteins in the cell nucleus that bind to the negatively charged DNA. See nucleosomes.
Somatic Cell
In animals, a cell of the body not involved in formation of gametes. Compare with germ line cell.
Interphase
The stage of the cell cycle between successive mitotic divisions; its subdivisions are the G-22 / Glossary phases.
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