While the maximum number of electrons required to fill the outermost shell of an atom varies depending on the size of the atom, almost all of the smaller atoms (atomic numbers 2-20) are considered stable, and thus nonreactive, when they contain ________ electron(s) in the outermost shell.
A. 1
B. 8
C. 16
D. 2
Answer: B
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When Ron Evans generated transgenic mice in which the gene PPAR-delta was constituitively active (i.e., always expressed), he found that these mice showed a shift from fast glycolytic fibers to slow oxidative fibers. One consequence of this change was that the transgenic mice
A. showed greater endurance in a running test. B. showed less endurance in a running test. C. had leg muscles with lower mitochondrial and capillary densities than wild-type (nontransgenic) mice. D. were more likely to become obese than wild-type (nontransgenic) mice. E. had muscles that were not as red as those of wild-type (nontransgenic) mice.
Volume increases by the ____ of the diameter,
and surface area increases by ____ of the diameter. a. square; doubling b. square; the cube c. cube; the square d. cube; the cube e. none of these is the correct answer
The significance of totipotency is that:a
genes are not regularly lost during development. b. most organisms can be easily cloned. c. differentiation leads to the loss of certain genes in each cell. d. somatic cells are incapable of differentiation. e. unexpressed genes are lost during developm
Which type of organism would a microbiologist grow on defined media?
A) organisms with complex growth requirements B) certain autotrophs C) fastidious organisms D) pathogens from clinical samples E) a broad collection of heterotrophs