When new species move into a wide range of habitats during microevolution, it is known as ____
a. adaptive radiation
b. natural selection
c. genetic drift
d. mass extinction
e. minor extinction
ANSWER: a
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Which of the following neurotransmitters is mismatched?
a. acetylcholine : muscle contraction b. endorphins : pain relief c. norepinephrine : response to stress d. serotonin : sexual function e. dopamine : reward -based learning
The two photosystems of light reactions are
designated a. type 1 and type 2. b. type I and type II. c. photosystem A and photosystem B. d. photosystem 680 and photosystem 700. e. photosystem I and photosystem II
The origin of a skeletal muscle is
a. attached to the less mobile portion of the skeleton. b. attached to the portion of the skeleton that moves when the muscle contracts. c. never attached to the skeleton. d. its belly.
The drug cytochalasin B blocks the function of actin. Which of the following aspects of the cell cycle would be most disrupted by cytochalasin B?
A) spindle formation B) spindle attachment to kinetochores C) cell elongation during anaphase D) cleavage furrow formation and cytokinesis