The process that normally has the greatest effect on water balance of an individual is
a. urinary excretion.
b. tears.
c. evaporation from skin.
d. defecation.
e. evaporation from respiratory surfaces.
a
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When Luria and Delbruck assayed bacterial growth on the petri plates, what did they find?
Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. A) All plates had some bacterial colonies; some plates had more bacterial colonies than others. B) Some plates had no bacterial colonies; others had varied numbers of colonies. C) All plates had a similar number of bacterial colonies. D) Some plates had no bacterial colonies; all of the other plates had a similar number of bacterial colonies. E) No bacterial colonies formed on any of the plates.
Predict the result when a phosphate-containing chemical is released by a factory into a pond
A) Eutrophication will occur. B) Predatory fish will increase in population faster than other living things. C) All living things will always die in such cases. D) Climax species will invade.
How is DNA acquired during conjugation?
a. from the environment b. from bacteriophage c. from other bacteria d. all of the above e. none of the above
If an allele has multiple effects, it is __________.
a. a polygene b. codominant c. pleiotropic d. an autosome