Binary fission is:
A. cell division by simple splitting
B. exchange of genes between two cells
C. fluorescent in situ hybridization (FISH)
D. cell division by meiosis
E. cell division by mitosis
Answer: A
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Volcanic activity on early Earth was responsible for the release of ____
a. gases for the early atmosphere b. oxygen for photosynthesis c. water vapor necessary to form the first oceans d. gases for the early atmosphere and oxygen for photosynthesis e. gases for the early atmosphere and water vapor necessary to form the first oceans
Currently malaria ____
a. kills about two million people each year in the U.S. b. has no known treatment c. can be prevented with a vaccination d. can be prevented with the drug quinidine e. is a temporary infection
You are an engineer at a power plant that creates large volumes of hot waste water, which disrupts the ecosystem of the river it drains into. Another part of the plant requires warm oil, and the plant uses large amounts of energy to heat it. Inspired by countercurrent exchange in whales, you save energy and benefit the environment by
A. running the oil pipes under the river after dumping in the hot waste water B. adding a sensor, integrating center and effectors to control temperature in both pipes C. running the oil pipes around the waste water pipes, to allow heat transfer from water to oil D. running the waste water and oil through a single pipe
What is the significance of the industrial practice of waiting for cultures to enter the stationary phase of growth before harvest?
A) The cells are at peak metabolic activity. B) Secondary metabolites are often the desired product, and are only produced in stationary phase. C) The desired primary metabolites are produced in stationary phase. D) Potential toxins from log phase growth have been depleted. E) An optimal combination of primary and secondary metabolites is being produced.