The two MAJOR divisions of the nervous system are the
a. autonomic and peripheral systems.
b. sympathetic and parasympathetic systems.
c. cranial and spinal nerves.
d. central and peripheral nervous systems.
e. brain and spinal cord.
D
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An example of mechanical isolation would be
a. flowers that bloom months apart. b. two organisms that are pollinated by different insects. c. two organisms that have different habitats. d. two organisms that have incompatible gametes. e. two organisms that have different mating rituals.
Which of the following proteins is associated with the precise control of where microtubules depolymerize during mitosis?
A) Tau B) stathmin/Op18 C) gelsolin D) catastrophins E) MAP 2
Among enzymes required for DNA replication, ligases are needed to form bonds between nucleotides to join DNA segments.
A. covalent B. ionic C. hydrogen D. weak chemical E. peptide bonds
Lichens are used by scientists as an indicator of pollution because they
a. require nonpolluted water to grow. b. are extremely sensitive to sulfur dioxide. c. react to small amounts of carbon monoxide. d. are very sensitive to ultraviolet radiation. e. respond to increased levels of chlorofluorocarbons.