【判断题】Water-soluble messengers bind to receptors on the plasma membrane. The pathways induced by activation of the receptor often involve second messengers and protein kinases.
【单选题】About 150 genes in the human genome encode phosphoprotein phosphatases, fewer than the number (544) encoding protein kinases, reflecting the relative _____________ of the phosphoprotein phosphatase.
【简答题】Many oncogenic viruses elaborate protein-tyrosine kinases that modify the regulatory s that control patterns of gene expression, (导致) to the initiation and progression of cancer.