Which of the following taxa would be the least inclusive?
a. genus
b. family
c. phylum
d. order
e. class
a
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The genetic makeup of an organism is its
(a) phenotype. (b) genotype. (c) locus. (d) gamete.
Duplication of individual chromosomes instead of whole genomes can occur by ________________.
Fill in the blank(s) with the appropriate word(s).
A layer of host cell membrane attached to a virus is called:
a. An envelope b. A protein coat c. A capsomere d. A capsid e. A plasmid
Under the conditions known as El Niño, the inorganic nutrient content of the seawater off the coast of Peru declines to very low levels. What effect will this likely have on marine life in the area?
A) The lower the levels of minerals, the less polluted the water; hence, most populations will increase. B) It will result in toxic red tides, which will reduce the populations of many species. C) It will reduce the abundance of phytoplankton and, consequently, the abundance of other organisms. D) It will increase the productivity of phytoplankton and, therefore, the productivity of other organisms by allowing sunlight to penetrate deeper into the ocean.