Which of the following has not been considered as a "gold standard" taxonomic method applied to species designation.
A. Average nucleotide identity
B. DNA-DNA hybridization (DDH)
C. Microscopic cell phenotype
D. Melting temperature of the DNA (a reflection of the G+C content)
Answer: C
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____ introduce(s) new genetic combinations of
alleles into the chromosomes.
a. Independent assortment in meiosis I b. Crossing over in meiosis II c. Breeding between the dominant individuals in the population d. Breeding between the recessive individuals in the population e. More than one of these
The byproduct of the metabolism of cyanobacteria that had the most effect on the further evolution of life is ____
a. oxygen gas b. carbon dioxide c. water d. nitrogen gas e. hydrogen gas
The rise of methicillin-resistant Staphylococcus aureus (MRSA) can be considered to be an example of artificial selection because
A. humans purposefully raise MRSA in large fermenters in an attempt to make the bacteria ever-more resistant. B. humans are becoming resistant to bacteria by taking methicillin. C. humans synthesize methicillin and create environments in which bacteria frequently come into contact with methicillin. D. S. aureus is cultivated by humans to replenish the soil with nutrients.
Unsaturated tails of lipids
a. are hydrophilic. b. are stable and tend to break apart. c. give the membrane a fluid quality. d. will break whenever exposed to phosphate ions. e. act as carriers.