The hormone most directly responsible for inducing ovulation is _____.
A. progesterone
B. fertilin
C. luteinizing hormone
D. follicle-stimulating hormone
Answer: C. luteinizing hormone
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Which of the following forms of oxygen is/are generally toxic to living organisms?
A) superoxide anion B) hydrogen peroxide C) hydroxyl radical D) superoxide, hydrogen peroxide, and hydroxyl radicals are all toxic
A physician sends a stool sample to your lab, and wants to know if there are lactose fermenting microbes in the sample. How might you determine if these microbes are present or not from this mixed-microbe specimen?
A. Streak the sample for isolation on Thayer-Martin agar (which contains lactose and particular antibiotics for selectivity). B. Streak the sample for isolation on a blood agar plate (which contains lactose AND red blood cells that enrich the culture for iron). C. Streak the sample for isolation on a MacConkey agar plate (which contains lactose and a pH indicator that turns pink when acid byproducts are present). D. None of the above would work-there's no way to reliably determine this feature from the specimen given.
Among the discoveries that Correns and Bauer (1908 ) made in plants was that, sometimes, reciprocal crosses resulted in what phenotype only?
What will be an ideal response?
The ____ and ____ of rivers are key determinants of their physical habitats
a. flow rate; volume b. size; shape c. flow rate; temperature d. location; volume e. biodiversity; species richness