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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a. XY b. YY c. XX d. XZ e. ZZ
The extrinsic clotting pathway
a. is initiated by platelet factor b. is primarily responsible for clotting in tissues c. has more steps than the intrinsic pathway d. is set off when Hageman factor comes into contact with collagen in an injured vessel e. has none of the above characteristics
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Tom is in respiratory arrest due to an electrical shock. Why does a good samaritan have up to 4 or 5 minutes to begin CPR and save Tom's life?
A. There is a venous reserve of oxygen in Tom's blood. B. There is reserve oxygen in Tom's lungs. C. The Haldane effect lasts up to 5 minutes. D. The ambient PO2 can support life that long. E. Tom's hypoxic drive will keep him alive for up to 5 minutes.