The minimum number of genes necessary for the normal functioning of a free-living cellular organism is about
a. 100.
b. 500.
c. 1500.
d. 5000.
e. 13,000.
Ans: c
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The crash of the codfish population and the white abalone are both due to:
a. invasive species b. plastics in ocean c. ocean pollutants d. overharvesting e. habitat destruction
Lipids differ from other large biological molecules in that they _____.
A. are much larger B. are not truly polymers C. do not have specific shapes D. do not contain carbon E. do not contain nitrogen and phosphorus atoms
Four of the following characterize most prokaryotes. Which one is the exception?
A. Lack of a nucleus B. A single circular chromosome C. Cell wall D. Complex internal membranes E. Great metabolic diversity
Situation 14.1 is an example of
A) human reservoirs. B) a zoonosis. C) a nonliving reservoir. D) a vector. E) a focal infection.