NOTHING happens within a cell that is not under the STRICT control of [proteinaceous] ENZYMES. Both structural and functional, all enzymes have ON and OFF switches that are, not too surprisingly, controlled by other proteins, which are themselves, in turn, Governed by The Cell Cycle: which begins when the Cell's cell-size-of-growth-indicators say-time-to-divide.
regulate the cell cycle.
cyclins
The cell cycle is controlled by specific cyclins, which are proteins that regulate the cell cycle.
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CYCLIN
Cyclins
Proteins called internal regulators and external regulators control the cell cycle. Internal regulatory proteins allow the cell cycle to proceed only when certain events have occurred in the cell itself. External regulatory proteins direct cells to speed up or slow down the cell cycle.
Cyclins are regulatory proteins that play a crucial role in controlling the progression of the cell cycle by binding to cyclin-dependent kinases (CDKs) and activating them. They help regulate the timing and coordination of key events in the cell cycle, such as DNA replication and mitosis.
cyclins If there are questions that are NOT answered and is unkown.. I strongly suggest yahooanswers instead:}
Cyclins and regulatory proteins. Regulatory proteins include internal regulators and external regulators
regulate the cell cycle.