Which of the following processes is associated with some prokaryotic cells but not with eukaryotic cells?
(A) Photosynthesis
(B) Aerobic respiration
(C) Meiosis
(D) Nitrogen fixation
(E) Endocytosis
Ans: (D) Nitrogen fixation
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Which of the following may be used as sources of energy by chemolithotrophs?
A. Reduced nitrogen compounds B. Reduced sulfur compounds C. Hydrogen gas D. All of the choices are correct.
A dye often used for its ease and sensitivity to visualize nucleic acid after agarose gel electrophoresis is
A. nigrosin. B. malachite green. C. gold oxide. D. ethidium bromide.
Which London surgeon noted in 1775 that chimney sweeps exhibited frequent cancer of the scrotum?
A. Katsusaburo Yamagiwa B. Sir Percivall Pott C. Ernst Winder D. John Hill E. Richard Doll
________ is necessary for a population to survive over successive generations in response to environmental changes
A) Speciation B) Gene flow C) Adaptation D) Sexual selection