Once a probe has hybridized with a gene of interest in a DNA library, the hybrid is identified by detection of ____
a. its sticky tail
b. its radioactive label
c. restriction enzymes
d. mRNA
e. the vector
ANSWER: b
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Which of the following statements is not true regarding mesophyll cells?
A. Mesophyll cells at the top of the leaf are columnar and tightly packed to optimize photosynthesis. B. Mesophyll cells close to the stomata are shaped to maximize air spaces between cells. C. Mesophyll cells close to the stomata are not tightly packed. D. Mesophyll cells in all locations in the leaf are tightly packed to optimize photosynthesis. E. Mesophyll cell position allows for increased diffusion of CO2 into the leaf.
Which naturalist wrote a 44-volume natural history on plants and animals, and suggested migration, environmental influences, isolation, and overcrowding might affect how organisms descend with modifications?
A. Darwin B. Leclerc C. Lamarck D. Cuvier E. Lyell
One of the most common causes of mental retardation in the United States is
a. congenital rubella syndrome. b. cocaine addiction. c. fetal alcohol syndrome. d. use of thalidomide by pregnant women. e. use of tetracycline by pregnant women.
A ________ mutation does not alter the amino acid sequence of the resulting protein.
A. missense B. silent C. nonsense D. None of the choices are correct.