Which of the following are the main decomposers of the Earth?
A. bacteria and viruses
B. algae and viruses
C. protists and fungi
D. bacteria and fungi
E. All organisms are decomposers.
Answer: D
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Some of the characteristics used to describe biomes include:
A. precipitation and number of grass species. B. precipitation and average temperature. C. precipitation and number of trophic levels in the communities. D. precipitation and species richness.
All the populations of different organisms that live in the same place form a(n) ____
a. ecosystem b. community c. biosphere d. sample e. organ
The biological basis of nicotine addiction is that nicotinic receptors bind
A) nicotine molecules and the neurotransmitter acetylcholine. Binding releases dopamine, which causes pleasurable feelings. B) postsynaptic receptors that normally bind endorphins. C) the dopaminergic receptor, releasing acetylcholine, which causes the pleasurable feelings. D) the pleasure center in the brain.
In a chromosomal inversion a segment of a chromosome is:
a. reversed. b. duplicated. c. lost. d. attached to a nonhomologous chromosome. e. deleted