chromosome replication initiates in eukaryotic cell during s phase.
during what phase does chromosome replication initiate in eukaryotic cell?
s phase
g1 phase





























the g phase, or gap 1 phase, is the first of four phases of the cell cycle that takes place in eukaryotic cell division. in this part of interphase, the cell synthesizes mrna and proteins in preparation for subsequent steps leading to mitosis. g phase ends when the cell moves into the s phase of interphase.





























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g phase together with the s phase and g phase comprise the long growth period of the cell cycle called interphase that takes place before cell division in mitosis (m phase).
g1 phase
an essential feature of the "caulobacter" cell cycle is that the chromosome is replicated once and only once per cell cycle. this is in contrast to the "e. coli" cell cycle where there can be overlapping rounds of chromosome replication simultaneously underway. the opposing roles of the "caulobacter" dnaa and ctra proteins are essential to the tight control of "caulobacter" chromosome replication. the dnaa protein acts at the origin of replication to initiate the replication of the chromosome. the ctra protein, in contrast, acts to block initiation of replication, so it must be removed from the cell before chromosome replication can begin. multiple additional regulatory pathways integral to cell cycle regulation and involving both phospho signaling pathways and regulated control of protein proteolysis act to assure that dnaa and ctra are present in the cell just exactly when needed.
caulobacter crescentus