The target cells for hormones
a. have special receptor sites.
b. are not located in roots.
c. are no different from any other cells.
d. are located in the interior of the plant.
e. include all of these descriptions.
Answer: a
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Which of the following white blood cells kill
cancerous body cells?
a. cytotoxic T cells b. B lymphocytes c. natural killer lymphocytes d. mast cells e. more than one of these white blood cells kill cancerous body cells
Graph B shows that breeding bird species
richness a. is greater than 1,000 at the equator. b. drops off in northern and southern latitudes. c. is less than that of ants at 30 degrees north latitude. d. drops by more than an order of magnitude at 40 degrees north latitude. e. includes all of these.
Fluorine has an atomic number of 9. Which of the following would you do to a neutral fluorine atom to complete its valence shell?
A) add 1 electron B) add 2 electrons C) remove 1 electron D) Nothing. If fluorine is neutral, it has a complete valance shell.
Which of the following factor(s) limit(s) exponential growth of a population?
A. limited resource availability B. competition with other species C. competition between members D. increases in predator populations E. All of these choices limit exponential growth.