In desertification ________
a. lands are deserted because chemical contamination makes them unsafe for human habitation
b. marginal agricultural lands are deserted to permit the re-establishment of native communities
c. large regions of land capable of supporting agriculture are degraded to a desert-like condition
d. marginal desert-like tracts of land are rehabilitated and put back into agricultural production
c
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Prosthecae are an adaptation for
A) anaerobic growth. B) cell differentiation under harsh conditions. C) nitrogen fixation. D) low nutrient aquatic environments.
Many integral membrane proteins have not been analyzed by X-ray crystallography. However, transmembrane segments can be inferred using computer analysis of the amino acid sequence of the protein. This technique is known as
A) homeoviscous adaptation. B) lipid analysis. C) lipid rafting. D) hydropathic analysis. E) SDS-PAGE.
New genes are thought to arise by which mechanism?
A) Gene duplication followed by divergence due to mutation. B) Fusion of two genes due to mating between individuals of two different species. C) Conversion of introns to exons by the accumulation of mutations. D) Mutation of a DNA sequence activates a gene that was previously turned off.
Which is not an example of aneuploidy?
A) monosomy B) tetraploidy C) trisomy D) nullisomy