Johne's disease, that primarily affects the small intestine of ruminants, is caused by:
A. Mycobacterium tuberculosis
B. Mycobacterium avium subspecies paratuberculosis
C. Mycobacterium bovis
D. Mycobacterium bacteremicum
Ans: B. Mycobacterium avium subspecies paratuberculosis
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In a synapse, a neurotransmitter is released _____
A) in response to an action potential depolarizing the presynaptic membrane B) when threshold potential is reached C) when enough voltage-gated sodium channels open to release calcium into the synapse D) through gap junctions joining the synaptic membranes
Although Lamarck's hypothesis was wrong, it is significant. Why?
What will be an ideal response?
Action potentials in muscle fibers cause
a. the sarcoplasmic reticulum to release ATP. b. the sarcoplasmic reticulum to release calcium. c. myosin-actin bonds to break. d. the energizing of myosin molecules. e. all of these to occur.
The phenomenon whereby a small number of species diversify into a much larger number of species, able to live in a wide diversity of habitats is known as:
a) mass extinction. b) microevolution. c) adaptive radiation. d) colonization. e) background extinction.