Skin fibroblasts arrested in G0 are stimulated near a wound to enter G1 by _______ growth factor.
a. epidermal
b. fibroblast
c. platelet-derived
d. keratinocyte
Ans: c. platelet-derived
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Core-periphery patterns are modified by
A) deindustrialization. B) creative destruction. C) government intervention. D) innovations in transport and communication. E) deindustrialization, creative destruction, government intervention and innovations in transport and communication.
HDL cholesterol is considered "good" cholesterol. What role does HDL play in preventing coronary heart disease?
a. HDL cholesterol inhibits LDL cholesterol synthesis b. HDL cholesterol prevents transport of LDL cholesterol in blood c. HDL cholesterol activates LDL cholesterol breakdown d. HDL cholesterol prevents free radical formation in plaques e. HDL cholesterol removes excess cholesterol from plaques
Which of the following characteristics applies to both B and T cells?
a. mature in the bone marrow b. can differentiate into memory cells c. secrete proteins d. participate in acquired immunity e. involved in phagocytosis
Suppose Priestley repeated his experiment using many kinds of plants besides mint, and that when different plants were placed under the jar the candle remained lighted for different periods of time. What would be a logical conclusion from these experiments?
a) Different plants require different amounts of water. b) Different plants release different amounts of carbon dioxide. c) Different plants require different amounts of light. d) Different plants release different amounts of oxygen.