The role of cAMP when it acts as an intracellular mediator in cells is to
A. directly activate genes in the nucleus to produce mRNA by binding to DNA.
B. control levels of calcium in the cell.
C. bind to and activate protein kinase.
D. directly activate structural enzymes in the cytoplasm of the target cell.
E. catalyze a cascade reaction that ultimately activates genes on the DNA.
Answer: C
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An antibody binds to an antigen at a specific area called the
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