Materials like calcium, sulfur, iron, and many other minerals move within the plant
a. only via xylem.
b. only via phloem.
c. only in parenchyma.
d. in parenchyma and phloem.
e. in both xylem and phloem.
C
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Cellular pH is kept near a value of 7 by the
action of
a. salts. b. buffers. c. acids. d. bases. e. water.
Place the following events of an inflammatory event in response to bacterial infection in proper order
1. Activated complement binds to bacteria. 2. Capillary permeability increases. 3. Phagocytes engulf bacteria. 4. Mast cell receptors bind to bacterial antigens. 5. Signaling molecules cause arterioles to widen.
a. 4-5-2-1-3 b. 4-3-1-2-5 c. 5-2-1-4-3 d. 1-3-4-2-5 e. 5-2-4-1-3
In polymerase chain reaction technology, the two strands of DNA are separated by:
a. gel electrophoresis. b. treatment with restriction enzymes. c. centrifugation. d. exposure to high pH. e. exposure to heat.
What is not a function of parathyroid hormone?
A. It increases reabsorption of Ca2+ in the kidney. B. It increases calcium absorption across the intestine. C. It increases calcium production in the liver. D. It stimulates osteoclasts to dissolve calcium phosphate crystals in bone.