Which of the following methods or steps has NOT been shown to allow DNA to enter cells?
A) Electroporation
B) Transformation
C) Heat shocking of cells at 42ºC
D) CaCl2 treatment of cells
E) Restriction DNA analysis
E
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Four of the five characteristics listed below are those
of an unchanging, nonevolving population. Select the exception. a. random mating b. no mutation c. differential survival d. no migration or gene flow e. infinitely large population
Secondary growth (thickening) arises from
__________. Fill in the blank(s) with the appropriate word(s).
Aerobic respiration involves the transfer of many electrons from glucose to electron carriers such as NAD+ over a series of multiple steps. Ultimately though, it is the reaction of glucose with oxygen to generate carbon dioxide, water and energy. Why doesn't glucose react directly with oxygen in cells?
A. The direct reaction of oxygen with glucose would be extremely destructive to cells. B. The reaction of oxygen with glucose is not spontaneous. C. Oxygen and glucose are localized in different subcellular compartments. D. Oxygen cannot accept electrons, and thus an electron carrier like NAD+ is needed.
When you move your fingers to turn the page, you are using the nervous system and
A) adipose tissue. B) skeletal muscle. C) cardiac muscle. D) simple epithelium. E) endocrine glands.