Which of the following bacteria that inhabit the mouth is involved in plaque formation?
A. Streptococcus mutans
B. Haemophilus spp.
C. Streptococcus viridans
D. Lactobacillus spp.
E. Staphylococcus spp.
Answer: A. Streptococcus mutans
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A buildup of H2CO3 in the blood will lead to
a. alkalosis. b. calcium buildup. c. acidosis. d. hydroxide ion increase. e. HCO3 ? increase.
The ground tissue lacking in the primary eudicot root is:
a. pith b. periderm c. cortex d. vascular cambium e. pericycle
Destructive outbreaks of pests are ____ in cultivated fields, which are low-diversity communities, than in natural
communities with greater species richness. a. less common b. more common c. equally common d. most easily prevented e. rarely occur
Suppose that the bottom of an ocean floor is disrupted, and bits of algae along with other bottom-dwelling microorganisms are scattered about into the ocean water. Which organism would be able to take the best advantage of this temporary food source?
A) sponges B) cnidarians C) parasitic flatworms D) soil-dwelling nematodes