Hotspot regions make up only 2 percent of the total land mass but contain what percentage of the world's endemic plant species?
A) 2 percent
B) 50 percent
C) 75 percent
D) 90 percent
B
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Bacteriorhodopsin is a light-sensitive pigment found
in _________ archaeans and used to supply energy for __________. production. a. halophilic; ATP b. thermophilic; carbohydrate c. methanogenic; methane d. halophilic; carbohydrate e. thermophilic; ATP
In striated muscle contraction, the Ca2+-ATPase pump
A) releases Ca2+ from the T tubule. B) secretes Ca2+ from the axon terminal. C) is voltage-gated. D) decreases Ca2+ in the sarcoplasm. E) increases Ca2+ binding to TnC.
Aggressive encounters between individuals of the same species
A) occur only when food supplies are low. B) usually include rituals or displays. C) usually result in one of the individuals being injured. D) do not occur in nature. E) are always a fight to the death.
Substances that can be added to a microbial culture to prevent drastic changes in pH are called ________
a. supplements b. antacids c. bases d. buffers