Genes, radiation, and sunlight exposure can be ________ to make a cell cancerous.
A. tests
B. counters
C. impediments
D. triggers
Answer: D
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The cells in a hair follicle that are responsible for forming the hair are
A) papillary cells. B) medullary cells. C) matrix cells. D) Merkel cells. E) cortical cells.
"You can't possibly have breast cancer," said Jim to his roommate Eliot, who was
distraught after a visit to a doctor. "You're a man!" "No, Jim. A certain percentage of breast cancer cases are in men." That percentage is A) 1.0 B) 0.75 C) 10 D) 0.5
Which of the following statements is FALSE?
Nutrient reabsorption occurs primarily at the proximal convoluted tubule. The nephron loop regulates the amount of water lost in the urine. Filtration occurs exclusively in the renal corpuscle, across the glomerular walls. Active secretion occurs primarily in the collecting duct.
Why are valves located in veins but not in arteries?
A) Valves are located in veins because the wall is thin enough to accommodate the valve. B) Valves are located in veins to prevent blood from flowing backward because venous pressure is too low to keep the blood moving back toward the heart. C) Valves are located in veins because they have three wall layers instead of the two layers that arteries have. D) Valves are located in veins because veins are the only type of blood vessel where blood travels one-way instead of both ways in the vessel. E) Valves are located in veins because veins see the highest blood pressures so the valves protect the walls of the veins.