A colony of mice is treated with a noninfective form of the bacterium Streptococcus pneumoniae. A
new researcher exposes this noninfective form to heat-killed cells of an infective strain. What would
be the effect of this action in the mouse population?
a. The mice will all remain healthy.
b. Some mice will die, but most will live.
c. The mice will get sick with pneumonia.
d. Some will get sick with pneumonia, but most will live.
e. The mice will become immune to the bacterium.
C
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The ATP synthase complex in the thylakoid membrane
A) contains an embedded CF1 component and a protruding CFo component. B) is identical to the FoF1 complex of mitochondria. C) performs photophosphorylation in oxygenic phototrophs. D) contains an assembly of hydrophobic polypeptides that function in ATP synthesis. E) all of the above
While going for an autumn hike in the forest, you see some trees with green leaves and others with red, yellow, and orange colored leaves. What explains the difference in the leaf color in autumn?
What will be an ideal response?
The best explanation for the phenotypic differences between humans and chimps despite the great similarities in their gene-coding sequences is
A. the vast differences in the introns between their genomes. B. differences in gene expression between species. C. the vast differences in exons between their genomes. D. the junk DNA of humans contains important sequences not present in chimps.
Darwin drew on the work of Thomas Malthus, a political economist, to convince his readers that:
a. there is a competition for limited resources in nature. b. many individuals in a population do not survive to the age of reproduction. c. only a fraction of individuals in a population reproduce. d. None of the above.