Ornamental hydrangeas are well known to produce either blue or magenta flowers, depending on soil pH. This may be a good example of a discrete trait influenced by
A) genetics.
B) environment.
C) multiple genes.
D) A and B only
E) A, B, and C
B
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Which one of the following statements about the methylation state of CpG islands is incorrect?
A. Cells can heavily methylate CpG islands of viral DNA sequences in order to restrict their expression. B. Cancer cells often methylate CpG islands in genes that could restrict cell growth. C. The methylation state of CpG islands provides a way to turn genes on or off. D. The methylation state of CpG islands is rigid and will not change over time. E. The methylation state of CpG islands can change in response to the environment.
Which of the following statements best discriminates among phylogenetic trees based on a maximum likelihood approach?
A. The preferred tree requires the fewest mutations to occur. B. The preferred tree requires the most mutations to occur. C. The preferred tree gives the lowest probability of producing the observed data. D. The preferred tree gives the highest probability of producing the observed data.
Which of the following is not a measure to avoid a shark attack?
a. Swimming where people, fish and/or blood are in the water b. Swimming at night, dusk or in murky water c. Swim with erratically behaving schools of fish d. Avoid splashing or wearing shiny jewelry
The atmosphere and seas of the early Earth lacked oxygen. What kind of organisms could NOT have lived under those conditions?
A. chemoautotrophs B. obligate anaerobes C. cyanobacteria D. obligate aerobes E. facultative anaerobes