In a chromosomal inversion, a segment of a chromosome is:
a. reversed.
b. duplicated.
c. lost.
d. attached to a nonhomologous chromosome.
e. deleted.
a
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C3 plants are more susceptible to photorespiration than either C4 or CAM plants. Why do most plants lack the C4
pathway?
a. Rubisco is more efficient in C3 plants when compared to rubisco of C4 and CAM plants. b. Photorespiration is not a serious problem for most plants. c. Most plant species do not have vacuoles in their cells to store the malate generated from CO2 taken in during the night. d. There is an energetic cost to C4 and CAM pathways that only makes them advantageous in very hot and/or arid environments. e. Switching between C3, C4, and CAM photosynthesis is very difficult for most plants.
Darwin pondered which of the following questions
most heavily after his return to England? a. What could explain the great numbers of species? b. Does fossil evidence support the theory of uniformity? c. Are the extinct and living armadillos the same species? d. Did Galápagos finches have a common mainland ancestor? e. Will natural selection work in England?
The AIDS phase of HIV infection begins when the concentration of CD4 T cells in the blood drops below what concentration?
A) 2,000 cells per cubic millimeter B) 1,000 cells per cubic millimeter C) 500 cells per cubic millimeter D) 200 cells per cubic millimeter E) No CD4 T cells are observed.
The Most Probable Number (MPN) method is used
A) to estimate numbers of cells in samples with a high density of bacterial cells. B) when samples contain obligate anaerobes. C) to estimate numbers of cells in samples with a low density of bacterial cells. D) to isolate autotrophic bacteria. E) to determine the generation time of bacterial isolates.