<P> The process of cell division , called cell cycle , has four major parts called phases . The first part , called G phase is marked by synthesis of various enzymes that are required for DNA replication . The second part of the cell cycle is the S phase , where DNA replication produces two identical sets of chromosomes . The third part is the G phase in which a significant protein synthesis occurs , mainly involving the production of microtubules that are required during the process of division , called mitosis . The fourth phase , M phase , consists of nuclear division ( karyokinesis ) and cytoplasmic division ( cytokinesis ) , accompanied by the formation of a new cell membrane . This is the physical division of `` mother '' and `` daughter '' cells . The M phase has been broken down into several distinct phases , sequentially known as prophase , prometaphase , metaphase , anaphase and telophase leading to cytokinesis . </P>
<P> The process of cell division , called cell cycle , has four major parts called phases . The first part , called G phase is marked by synthesis of various enzymes that are required for DNA replication . The second part of the cell cycle is the S phase , where DNA replication produces two identical sets of chromosomes . The third part is the G phase in which a significant protein synthesis occurs , mainly involving the production of microtubules that are required during the process of division , called mitosis . The fourth phase , M phase , consists of nuclear division ( karyokinesis ) and cytoplasmic division ( cytokinesis ) , accompanied by the formation of a new cell membrane . This is the physical division of `` mother '' and `` daughter '' cells . The M phase has been broken down into several distinct phases , sequentially known as prophase , prometaphase , metaphase , anaphase and telophase leading to cytokinesis . </P>
when would the quantity of dna double when growing cells
when would the quantity of dna double when growing cells
S phase
S phase