The short sequence of DNA where RNA polymerase first attaches when a gene is to be transcribed is called the _____.

a. operator
b. active site
c. replication fork
d. promoter


Ans: d. promoter

Biology & Microbiology

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Lichens are symbiotic relationships established

between a. a club fungus and a green alga. b. a club fungus and a cyanobacterium. c. sac fungi and green algae. d. sac fungi and cyanobacteria. e. sac fungi and green algae or cyanobacteria

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All members of a group of ornithologists studying barn owls in the wild have had salmonellosis (Salmonella gastroenteritis). One birder is experiencing her third infection. What is the most likely source of their infections?

a. The ornithologists are eating the same food. b. They are contaminating their hands while handling the owls and nests. c. One of the workers is a Salmonella carrier. d. Their drinking water is contaminated.

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If an unknown streptococcal sample yields a positive CAMP test, which organism should you suspect?

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Biology & Microbiology