def blk 2 bio - S-Phase: In the cell cycle, the stage of...

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S-Phase: In the cell cycle, the stage of interphase during which DNA is replicated M-Phase: The portion of the cell cycle in which mitosis takes place Actin: One of the two major proteins of muscle; it makes up the thin filaments. Forms the microfilaments found in most eukaryotic cells Myosin: One of the two major proteins of muscle, it makes up the thick filaments Cdk’s: (cyclin-dependent kinase) a kinase catalyzes the addition of phosphate groups from ATP to target molecules. Cdk’s target proteins are involved in transitions in the cell cycle and are active only when complexed to additional protein subunits, cyclin. Cyclin: Proteins that activate cdk’s bringing about transitions in the cell cycle Ligand: any molecule that binds to a receptor site of another (usually larger) molecule Receptor: a site or protein on the outer surface of the plasma membrane or in the cytoplasm to which a specific ligand from another cell binds MSH: MSH receptor: ATP: an energy-storage compound containing adenine, ribose, and three phosphate
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def blk 2 bio - S-Phase: In the cell cycle, the stage of...

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