NTA Abhyas NEET2020BotanyCell Cycle and Cell DivisionPractice
For packing of a negatively charged DNA, a positively charged histone molecules rich in basic amino acids are required. This histones are formed during:
Options
- AG 1 - p h a s e
- BG 2 - p h a s e
- CS - p h a s e
- DG 0 - p h a s e
Correct answer
C. S - p h a s e
Step-by-step solution
Howard and Pelc (1953) have divided cell cycle into four phases or stages, i.e., G 1 , S, G 2 and M-phase. The G 1 -phase, S-phase, and G 2 -phase are combined to form the interphase. G 1 -phase It involves transcription of t-RNA, m-RNA and r-RNA synthesis of regulatory proteins, enzymes necessary for DNA synthesis, tubulin and other mitotic proteins. The G 1 -phase where differentiated somatic cell arrested is called G 0 - P h a s e . S-Phase During S-phase replication of DNA and synthesis of histone proteins occu