The deep scattering layer refers to:
a. an area where organisms are spread apart in a random manner.
b. a dense aggregation of migratory zooplankton and fish.
c. a safe area where zooplankton can quickly scatter to avoid predators.
d. where sonar from whales travels rapidly to facilitate their communication.
e. the abyssal zone.
B
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Which statement is true with regard to mutations?
A) ?Mutations are always harmful. B) ?Mutations always provide for beneficial changes in an organism's genetic makeup. C) ?Mutations are chosen by the organism to improve their survival. D) ?Mutations that survive in a population are determined by natural selection. E) ?Mutations are caused only by harmful chemicals.
The current cost of sequencing a human genome is
A. about $10 B. about $1,000 C. about $1,000,000 D. over $400,000,000
African sleeping sickness is caused by Trypanosoma brucei, a unicellular, flagellated protist that infects red blood cells after entering the bloodstream. Trypanosoma brucei is which of the following?
A. an alga B. a protozoan C. a slime mold D. a diatom E. a water mold
This experimental set up was designed to:
a. test the economy of scale of slime mold slugs and amoebas. b. test the reproductive ability of slime mold slugs and amoebas. c. test the aggregation ability of amoebas. d. test attraction of Dictyostellium to light.