The interaction between two species in which both species are harmed is known as:
a. mutualism
b. parasitism
c. commensalism
d. competition
e. predation
d
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Why do histone genes have the slowest molecular clock?
A. The structure of the histone gene must be conserved for DNA to function properly. B. Histone genes simply do not have the same rate of mutations. C. DNA-correcting mechanisms function more readily with histone genes. D. Cells have more histone genes than any other kind of gene. E. Histone genes normally have selfcorrecting mechanisms.
This microscope produces an image of a light cell against a dark background; internal structures are not visible.
A) Compound light microscope B) Phase-contrast microscope C) Darkfield microscope D) Fluorescence microscope E) Electron microscope
Two true-breeding mutant strains of Drosophila have black body color instead of the wild-type gray yellow. When the two strains are crossed, all the F1 flies have wild-type body color. How can these data be interpreted?
A) Recombination occurred. B) Complementation occurred. C) The mutations involved are on two different genes. D) A new mutation occurred in all the offspring. E) Both B and C
To date, humans have interfered with all of the biogeochemical cycles on Earth, but this interference has been of the
greatest magnitude, in terms of human-induced changes in climate, in the:a. hydrologic cycle. b. nitrogen cycle. c. carbon cycle. d. sulfur cycle. e. phosphorus cycle.