The smallest unit of life that can exist as a separate entity is a(n)
a. cell.
b. molecule.
c. organ.
d. population.
e. ecosystem.
ANSWER: a
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Carbohydrates are polymers formed of structural units called:
A. amino acids. B. fatty acids. C. nucleotides. D. glycerols. E. monosaccharides.
Movement of charged molecules in an electrical field, which is used to separate nucleic acid fragments for recombinant DNA work, is called
A. electrophoresis. B. iontophoresis. C. plasmaphoresis. D. nucleophoresis.
In contrast to positive and negative selection, _________ acts to maintain two or more alleles in a population
A. balancing selection B. disruptive selection C. stabilizing selection D. directional selection
A wolf that feeds on moose and elk would be classified within which trophic level?
A. herbivore B. primary producer C. primary carnivore D. secondary carnivore E. detritivore Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about trophic levels? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?