A mutation in the cdc28 gene in the budding yeast Saccharomyces cerevisiae causes cell-cycle arrest, giving rise to unbudded cells that look like "dumbbells." Treatment of wild-type cells with nocodazole, a drug that destabilizes some cytoskeletal polymers, leads to a similar phenotype. Based only on these observations, which statement is true regarding cdc28?
O a. The product of the cdc28 gene is responsible for resistance to nocodazole.
O b. The product of cdc28 destabilizes the same cytoskeletal polymers that nocodazole also destabilizes
O c. cdc28 codes for a master regulatory kinase that phosphorylates other proteins.
O d. Nocodazole binds to the protain coded by the cdc28 gene.
