The __________ biome has the greatest species richness of the terrestrial biomes
a. tropical rainforest
b. savanna
c. grassland
d. chaparral
e. temperate deciduous forest
A
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Smooth muscles can be activated by all of the following except:
A. the somatic nervous system. B. hormones. C. nitric oxide. D. pH. E. stretch of the muscle.
You want to examine the structure of the protein coat of a virus by microscopy. Which microscope is your best choice, and why?
A. The scanning electron microscope-it has excellent resolution and magnification, much higher than a light microscope, and can clearly visualize viruses. B. An atomic force microscope-this has the highest resolution and magnification of the microscopes we discussed. Here, we want to visualize a subcomponent of the virus particles, so we need the best value for resolution and magnification we can possibly achieve. C. A fluorescent microscope-this will let us tag the protein coat with colored dyes in order to visualize it using this light microscope at 1000x. D. A bright-field light microscope-of course, we'll need to stain the viruses before we can visualize them against the bright white background at 1000x total magnification.
The steady charge difference across the plasma membrane is called the
a. action potential. b. energy potential. c. electrolyte potential. d. resting membrane potential. e. kinetic potential.
Which cells of the pancreas produce somatostatin?
a. alpha cells b. beta cells c. delta cells d. F cells e. gamma cells