Question
Biology Question on cell cycle and cell division
In a cell cycle the RNA synthesis needed in protein synthesis, occurs in
synthetic period
post-mitotic gap period
pre-mitoticg apperiod
prophase
pre-mitoticg apperiod
Solution
The stage between two successive cell divisions is known as Interphase. In interphase, chromosomes are not condensed and are distributed throughout the nucleus. It is the largest period in the cell cycle and is divided into three phases - GS and G. During G-phase (or post -mitotic phase), the cell grows and synthesis of RNA, ribosomes, enzymes and proteins necessary for DNA synthesis occurs. During S-phase or synthetic phase the replication of DNA occurs.For replication of DNA, histone proteins are required so they are also synthesized during this phase. It takes about 30%-50% of the total cell cycle. The nucleotides get assembled together and DNA molecules are synthesized. During G2phase (or pre-mitoticphase), nucleolar RNA, ribosomal RNA,messenger RNA are all synthesised.