What may have been a site for the synthesis of organic molecules on the early Earth with its source of hot water and metal ions from rocks?
a. dried-out mud flats
b. stratified mica crystals
c. deep sea hydrothermal vents
d. the bottoms of tidal pools
e. pockets in lava beds
c
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_____ are close interactions between species that have evolved over long periods of time. When these interactions enhance the reproduction and population growth of both species, they are called _____
A. Symbioses; mutualisms B. Mutualisms; symbioses C. Symbioses; antagonisms D. Antagonisms; symbioses E. Antagonisms; mutualisms F. Mutualisms; antagonisms
The principal species of Staphylococcus found on the skin is
A. aureus. B. acnes. C. pyogenes. D. epidermidis
If the nitrogenous bases of both a DNA transposon and a retroelement were tagged with fluorescent markers, what statement best describes the result after transposition of both types of TEs has occurred?
A. The markers would be found at the new site of the DNA transposon, but not at the new site of the retroelement. B. The markers would be found at the new site of the retroelement, but not at the new site of the DNA transposon. C. The markers would be found at the new sites of the DNA transposon and the retroelement. D. The markers would be not be found at either new site.
The organization of muscle tissue from a macroscopic level to a microscopic one is as follows:a
muscle fibers ? myofibrils ? myofilaments. b. muscle fibers ? myofilaments ? myofibrils. c. myofibrils ? muscle fibers ? myofilaments. d. myofilaments ? myofibrils ? muscle fibers. e. muscle fibers ? myofibrils ? myofilaments.