Kinases. Kinases add phosphate to molecules, and the modification can serve as a "switch" to turn events in the cell on or off. CDKs or cyclin dependent kinases regulate the cell cycle.
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approximately 860 light-years (260 pc) from Earth
Answer:
they help lower the activation energy of chemical reactions
I believe plant cells because the only cells that have walls are plant cells and cellulose is strong and will help remain its shape.
