A restriction enzyme is a ____
a. viral enzyme that randomly cuts DNA
b. DNA ligase enhancer
c. bacterial enzyme that cuts DNA at specific sites
d. single-stranded RNA molecule
e. bacterial enzyme that functions in DNA replication
c
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Which of the following may be added to normal media to make it more selective for staphylococci?
A. 7.5% salt B. 0.5% HCl C. 1.0% glucose D. 5.0% mannose
During the Pleistocene epoch, plant communities changed dynamically in response to which mechanism?
a. a meteor impact b. iridium in the soil c. fluctuating climates d. intense grazing pressure e. competition with gymnosperms
The hallucinogen LSD is a product of ________.
A. ascomycetes B. basidiomycetes C. yeasts D. zygomycetes
Tubeworms around deep-sea hot vents house which symbiotic organism?
What will be an ideal response?