Which of the following is the most appropriate pairing of microbe and biosafety level?
A. E. coli, BSL-3
B. anthrax, BSL-1
C. Ebola, BSL-2
D. methicillin-resistant Staphylococcus aureus (MRSA), BSL-2
E. tuberculosis, BSL-1
Answer: D
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Most euryarchaea, except the class Archaeoglobi and the order Archaeoglobales, reduce sulfur during anaerobic respiration by using sulfate as a terminal electron acceptor.
Answer the following statement true (T) or false (F)
Natural killer cells destroy target cells by releasing ____
a. antibiotics, which breakdown the target cell’s membrane b. perforin, which creates holes in the target cell’s membrane c. histamine, which signals other blood cells to aggregate d. lysozyme, which breaks down the bacterium’s cell wall e. antibodies, which break down the bacterium’s cell wall
Of all the different codons that exist, three of them do not encode a particular amino acid. Their role is to:
a. allow for any amino acid to be added in their place. b. encode tRNA molecules. c. provide instructions on the tertiary structure of the protein. d. signal the start of translation. e. provide instructions to stop translation.
The incidence of BOTH fatal and nonfatal diseases in a population is called
a. mortality. b. morbidity. c. infection. d. pandemic.