Reception of a signal released by the same cell is which of the following types of signaling?
A) paracrine
B) endocrine
C) autocrine
D) juxtacrine
E) exocrine
Answer: C
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According to one hypothesis, how is water tension in the leaves maintained to pull water up the xylem?
A. Water is pulled by capillary action into spaces in between the cell wall, much like a sponge. B. Water is pulled up through the xylem due to capillary forces. C. Water exits the stomata due to capillary forces. D. Water is pushed up the xylem due to high water pressure from the roots. E. Water is pushed down from the leaves to the roots during hot sunny days.
The best terms for a fish whose body temperature varied between 4oC during the day when it is in deep, cold ocean waters and 26oC during the night when it comes to the surface to feed would be
A. endothermic and homeothermic. B. endothermic and heterothermic. C. ectothermic and homeothermic. D. ectothermic and heterothermic. E. ectothermic and endothermic.
Science is based on
a. faith. b. authority. c. evidence. d. force. e. facts.
The highest rates of reproduction would be expected in which of the following countries?
a. United States b. Germany c. Nigeria d. Argentina e. Russia