Which is a member of the domain Archaea?
A) gram-positive bacteria
B) methanogens
C) spirochetes
D) chlamydias
Answer: B
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Streptococcus pyogenes would be
A. beta hemolytic and catalase negative. B. beta hemolytic and catalase positive. C. alpha hemolytic and catalase negative. D. alpha hemolytic and catalase positive.
What is not an adaptation to avoid overheating and desiccation? a. A barnacle trapping water inside with calcareous plates
b. A mussel closing its shell at high tide. c. A crab simply moving towards water. d. An anemone covering itself with shell fragments.
The buildup of fatty deposits on the inner wall of arteries is associated with higher levels of HDLs (high-density lipoproteins) in the blood
Indicate whether the statement is true or false
Answer the following questions true (T) or false (F)
1. Ecological dominants are always the most abundant members of a community. 2. Because their absence may have negative repercussions for population control and resource use for the whole community, lions on the African savanna are identified as a keystone species. 3. To be a keystone species, an organism must be the most numerous species in an environment.