Microbes in our digestive tract that help us digest food demonstrate a ________ association.
a. parasitic
b. pathogenic
c. symbiotic
d. benthic
e. homeopathic
Ans: c. symbiotic
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The region of brain that coordinates antagonistic muscle movements is the
A) medulla oblongata. B) cerebellum. C) pons. D) thalamus. E) occipital lobe.
Figure 55-1 represents:
a. a fairly simple food web.
b. a fairly simple food chain.
c. a pyramid of biomass.
d. a pyramid of energy.
e. a pyramid of numbers.
If different populations of the same species become geographically isolated and evolve reproductive isolation over a period of time, then _______________ has occurred.
A. artificial selection B. extinction C. speciation D. adaptation E. classification
The polysaccharides agarose and carrageenan are isolated from red algae for commercial use. These polysaccharides are found in cell walls. What plant polysaccharide are they analogous to?
A. Mannose B. elastin C. Cellulose D. Collagen E. Amylose