________ convert nitrogen from nitrates to N2
A) Nitrifying bacteria
B) Nitrogen-fixing bacteria living in the soil
C) Denitrifying bacteria
D) Nitrogen-fixing bacteria living in the root nodules of legumes
C
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Charles Darwin noted that the human lineage probably arose out of Africa. Which of the following was most likely the reason behind his hypothesis?
A. Africa has warmer temperatures, which allows for greater diversity. B. Gorillas and chimpanzees, which are the primates most closely related to humans, only live in Africa. C. Africa was the first land mass that was suitable for life. D. This was before the advent of molecular analysis, so Charles Darwin was incorrect. E. None of the answer options are correct.
The transmission of Vibrio spp. to humans is by:
a. exposure of disrupted skin and mucosal surfaces to contaminated animal hides. b. ingestion of contaminated seafood or wa-ter. c. inhalation of contaminated air. d. close contact with carriers of the organism.
A life-threatening allergic reaction (difficulty in breathing, fall in blood pressure, severe stomach cramps) is known as ________
Fill in the blank(s) with correct word
Which issue has not been significant in the creation of genetically modified (GM) organisms?
A) some plants carrying genes from other species representing a possible threat to the environment B) inability of GM organisms to be modified to prevent them from reproducing once they pass beyond the experimental stage C) the fact that rogue microbes might transfer dangerous genes into other organisms D) the fact that the protein products of transplanted genes might lead to allergic reactions