Which phase of Clostridium botulinum produces botulin?

A) Endospores
B) Vegetative cells


B) Vegetative cells

Biology & Microbiology

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What types of DNA damage will trigger DNA repair?

What will be an ideal response?

Biology & Microbiology

If the incidence of Tay-Sachs is 1/3,600 Ashkenazim births, what is the heterozygote (carrier) frequency?

A) 0.0003 B) 0.033 C) 0.286 D) 0.017

Biology & Microbiology

Where do you expect to find thermophiles?

A) In anoxic environments B) In salty environments C) In dry environments D) In hot environments

Biology & Microbiology

Which of the following observations were an outcome of studies by David Tilman and coworkers at Cedar Creek, Minnesota on ecosystem stability? Check all that apply. 

_____ Plots with more species showed less year-to-year variation in biomass. _____ Species-rich plots were less affected by drought than species-poor plots. _____ Over-yielding was observed in more recent work at Cedar Creek. _____ Nitrogen uptake and total biomass produced were negatively correlated to species richness. _____ More diverse plots were less susceptible to invasion by new species.

Biology & Microbiology