Which of the following has not been considered as a "gold standard" taxonomic method applied to species designation.
A. Average nucleotide identity
B. Microscopic cell phenotype
C. DNA-DNA hybridization (DDH)
D. Melting temperature of the DNA (a reflection of the G+C content)
Answer: B
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Chemotherapeutic agents that are chemically modified natural products of microorganisms are most specifically referred to as ________.
A. semisynthetic drugs B. antimicrobial agents C. antibiotics D. synthetic drugs
In Mendel's peas, an individual heterozygous for seed color:
A. has only one kind of allele for seed color. B. has two different alleles for seed color. C. will express the dominant allele. D. will express the recessive allele. E. has two different alleles for seed color and will express the dominant allele.
What is a trace element?
A) An element that is very rare B) An element that is evenly distributed on the planet C) An element that is required in miniscule amounts for life D) An element that is used to identify the location of other elements
An apparent departure from the rule that species diversity increases toward lower latitudes is the decrease in species of mammals as one moves southward on the peninsula of Baja California. What factor might account for this southward decline?
A) increased intensity of competition B) increased intensity of predation C) increased dispersal distance from the continental source of species