The concept of an ecosystem differs from that
of a community in that, unlike the community,
the ecosystem includes the
a. producers.
b. decomposers.
c. physical environmental factors.
d. animals as well as the plants.
e. parasites.
C
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The physical barrier of the skin and the mucus produced by the epithelial cells lining body cavities ____
a. activate the complement system b. release histamines c. facilitate the production of antibodies d. comprise the innate immune system e. protect the body from infection by pathogens
The cell bodies of motor neurons are located
A) in the forebrain. B) in the gray matter of the spinal cord. C) next to the sensory receptors. D) in the muscles. E) outside the spinal cord.
A)_________ adjust focus by changing its thickness through contraction of Ciliary muscle, known as (B)_____________.
a. (A) lens, (B) accommodation b. (A) retina, (B) accommodation c. (A) lens, (B) adaptation d. (A) retina, (B) adaptation
You are working to identify enhancer regions of a particular gene. The best place to look is
A. immediately upstream of the promoter. B. primarily downstream of the promoter, including the exons of the coding region. C. primarily upstream of the promoter, possibly some distance away. D. immediately downstream of the promoter.