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A complex of two proteins called ____ gives the "ok" signal for a cell to begin...

A complex of two proteins called ____ gives the "ok" signal for a cell to begin mitosis. One of these proteins, called __ is always present. The other, a regulatory protein called__ is regenerated anew with each cycle?

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Answer #1

A complex of two proteins called MPF(Maturation promoting factor/M phase promoting factor)gives the "OK" signal for a cell to begin mitosis.One of these proteins,called CDK1 is always present.The other,a regulatory protein called cyclinB is regenerated anew with each cycle.

explanation: Normal cell cycle goes as (G0)-[G1-S-G2-M]-G1..

M is the mitotic phase.

cell cycle is regulated by activators and inhibitors.cell cycle progressions is driven by proteins called CYCLINS(named as for their cyclic nature of production and degredation)and CDKs(-cyclin dependent kinases). Both of these act as an unit.CDKs acquire the ability to phosphorylate protein substrate by forming complexes with relevent cyclins.

Here CDK1-cyclinB is essential for the G2-M transition that is second check point.After this cell can undergo mitosis.

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