Humans can be accidental intermediate hosts for some tapeworms.
Answer the following statement true (T) or false (F)
True
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The tuberculin skin test looks to identify ________ specific to Mycobacterium tuberculosis
A) antibodies B) antigens C) delayed hypersensitive (DTH) TH1 cells D) delayed hypersensitive (DTH) TC cells
Small circular molecules of “extra” DNA in bacteria
a. are plasmids. b. are DNA fragments from their main chromosome. c. result from the activity of restriction enzymes. d. are eventually degraded. e. are none of these.
An antiviral that is a guanine analog would have an antiviral mode of action that
A. blocks transcription and translation. B. blocks penetration. C. blocks maturation. D. inhibits DNA synthesis. E. bonds to ergosterol in the cell membrane.
Many scientists believe that we are in a global mass extinction caused by human activity. What is conclusive evidence for this assessment?
a. Current estimated extinction rates on islands are 10,000 times greater than background extinc-tion rates. b. Current estimated extinction rates on continents are 10,000 times greater than background ex-tinction rates. c. One genus of tropical butterflies lost 90% of its species during the past 30 years. d. Converting old-growth forest into agricultural fields causes dramatic losses in songbird diver-sity in the converted areas.