Which of the following methods is best for counting fecal bacteria from a stream to determine the safety of the water for drinking?
a. dry weight
b. turbidity
c. viable plate count
d. membrane filtration
Answer: d. membrane filtration
You might also like to view...
B cells react with antigens through TCR antigen receptors
Indicate whether the statement is true or false.
The small, non-protein molecules that can be readily separated from an enzyme and are responsible for transfer of atoms from one molecule to another are referred to as
A. vitamins. B. enzymes. C. hormones. D. coenzymes.
Scientists determined that African elephants are the closest living relatives of the woolly mammoth based on fossil
evidence, because DNA cannot yet be extracted from fossils of extinct species.
a. True b. False
The number of individuals that die in a population pe unit time is its
A. immigration rate. B. emigration rate. C. death rate. D. birth rate. E. expatriation rate.