Which of the following statements about blood clotting is FALSE?
A. It is a result of a cascade of enzyme activation.
B. It requires the presence of erythrocytes.
C. It is the formation of a thrombus.
D. It occurs after formation of a platelet plug in a damaged vessel.
E. It involves positive feedback by thrombin.
Answer: B
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Which of these covalently modifies proteins by phosphorylation?
A. Metal ions, such as Fe2+ B. Any ligand that can bind to specific binding sites C. Enzymes called protein phosphatases D. Enzymes called protein kinases E. Other proteins called allosteric proteins
A delayed response such as contact dermatitis is an example of what type of hypersensitivity reaction?
A) Type I B) Type II C) Type III D) Type IV
Urine drains from a major calyx into:
A) a papilla. B) the renal pelvis. C) the renal tubule. D) a minor calyx.
Infant respiratory distress syndrome (IRDS) is caused by ________
A) production of very thick respiratory mucus B) overinflated alveoli C) underdeveloped respiratory epithelium D) pulmonary edema E) deficiency of pulmonary surfactant