What are the short retinal photoreceptors responsible for color vision called?
A. Rods
B. Cones
C. Bipolar cells
D. Ganglion cells
E. Glial cells
Answer: B
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Examine Figure 21.14. If you wanted to use a molecular clock to date a relatively recent divergence event—say, one that occurred in the last 100 million years or so—which of the four types of genes would make the best clock? Why?
A. Fibrinopeptides, because they have changed the most over that time period. B. A histone gene, because it has changed relatively little over that time. C. Fibrinopeptides, because they have changed relatively little over that time. D. A histone gene, because it has changed the most over that time period. E. Hemoglobin, because of its moderate rate of change.
The base of a biomass pyramid is the smallest for ecosystems ____
a. in the desert b. in forest habitats c. in tundra habitats d. in the sea e. in prairie habitats
Photosynthesis in plants, algae, and cyanobacteria produces
a) oxygen. b) carbon dioxide. c) sulfur granules. d) hydrogen sulfide.
A tube that is 50% darkened in the Bile esculin test most likely contains which of the following streptococcal species?
A) S. agalactiae B) S. pneumoniae C) S. equisimilis D) E. faecalis