Which statement is true about the association of histone proteins and DNA?
A. Each histone protein has a deep groove into which a DNA double helix tightly fits.
B. Histone proteins insert themselves into the major groove of DNA.
C. Histone proteins form hydrogen bonds with the nucleotide bases of DNA.
D. Histone proteins have a high proportion of positively charged amino acids, which bind tightly to the negatively charged DNA backbone.
E. Histone proteins have a high proportion of negatively charged amino acids, which bind tightly to the positively charged DNA backbone.
Ans: D. Histone proteins have a high proportion of positively charged amino acids, which bind tightly to the negatively charged DNA backbone.
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