Answer:
Two groups of proteins, called cyclins and cyclin-dependent kinases (Cdks), are responsible for the progress of the cell through the various checkpoints. Cyclins regulate the cell cycle only when they are tightly bound to Cdks.
Explanation:
Phagocytes are cells that protect the body by ingesting harmful foreign particles, bacteria, and dead or dying cells.
Carbohydrates, lipids, proteins, and nucleic acids.
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