Briefly describe the ecology and trophic abundance of the Southern Ocean
What will be an ideal response?
The melting of polar ice combined with long days supports an abundant diatom population. The diatoms are in turn grazed on by krill. Krill, a shrimp like organism, is a major food source of birds, whales, fish, and squid. The squid are also a major food item for birds, whales, and fish. Humans have recently begun to harvest krill, which raises a concern that other species may be impacted.
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The bacterium Escherichia coli comprises a significant fraction of the bacterial population in healthy adult humans, ranging from 10-50%
Indicate whether the statement is true or false.
Gene silencing ____
a. cannot be inherited b. occurs when DNA is methylated c. occurs due to histone acetylation d. is an example of posttranscriptional regulation e. occurs only on the X chromosome
The exiting of wastes from the excretory system is called ____
a. reabsorption b. excretion c. filtration d. secretion e. diffusion
Assume that you are studying a trait determined by a number of polygenes. If there are seven phenotypic categories, how many genes are probably involved?
A) 3 B) 7 C) 2 D) 4