Discussion
In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called
Answer: A
Correct answer: protamines
In maturing sperm the histones are replaced by protamines - very small, extremely arginine-rich proteins that pack the DNA far more tightly than nucleosomes can, into an almost crystalline state. The result is a compact, transcriptionally silent nucleus that protects the paternal genome in transit. Purines and pyrimidines are classes of base, not proteins.
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