Cell Cycle and Cell DivisionMedium
Question
At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?
Options
A.During G2 -stage of prophase
B.During S-phase
C.During entire prophase
D.During telophase
Solution
Histone proteins are basic proteins and are used in packing of eukaryotic (absent in prokaryotes) DNA. DNA and histones together comprise chromatin, foeming bulk of the eukaryotic chromosomes. Histones are of five major kinds. H1, H2A ,H2B, H3 and H4. H1 histones link neighbouring nucleosomes (fundmental packing units of eukaryotic chromosome) while other are elements of nucleosome structre. During S-phase of cell cycle synthesis of histone proteins takes place because at this stage number of chromosomes become double to that of sombatic number.
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