Which of the following statements concerning bacterial growth at low temperatures is not true?
A) Low temperatures slow growth of cells
B) Low temperatures reduce the rate of chemical reactions
C) Low temperatures decrease the rate at which nutrients cross the cell membrane
D) Low temperatures destroy lipids that make up the cell membrane
E) Low temperatures reduce the fluidity of the cell membrane
D) Low temperatures destroy lipids that make up the cell membrane
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Ecologists are concerned about amphibian populations because
A. their loss would be an aesthetic loss to the planet. B. of the possibility of numerous medicinal uses. C. they are keystone species in many areas—their loss will cause other populations to crash. D. amphibians are very sensitive to environmental change—they may be indicating serious problems. E. they are increasing to the point of competing with indigenous species.
Where does mRNA/tRNA codon-anticodon recognition take place?
A. 30S B. 40S C. 50S D. The surface between the two ribosomal subunits
What differentiates diagnostic techniques that employ phenotypic (culture-based) methods from those that employ molecular methods?
a. Phenotypic methods are highly sensitive and specific, while molecular methods are not. b. Phenotypic methods examine the growth behavior of a microorganism and the pro-teins, enzymes, or toxins produced, while molecular methods examine the genetic makeup. c. Phenotypic methods are quantitative while molecular methods are not. d. Phenotypic methods are not limited to de-tection of live organisms as are molecular methods.
If nondisjunction occurs during meiosis I,
a. the resulting sex cells are heterogametes. b. one-half of the resulting cells are n + 1, and the other half are n – 1. c. diploid cells are produced. d. all gametes will lack a chromosome and be infertile. e. only one half the gametes are affected.