Man's pollution of public water sources includes
a. pesticides.
b. fertilizers.
c. carcinogenic chemicals.
d. radioactive materials.
e. all of these.
E
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In natural samples it is often difficult to differentiate live cells from dead cells or cells from nonliving matter
Indicate whether the statement is true or false.
Antibody titer can be measured by
A) negative microscopy. B) agglutination. C) plate counts done after isolating the pathogen. D) polymerase chain reaction.
You are studying genes in yeast and find that the genes can be placed into four groups that tend to be inherited together. From this you can conclude that yeast
A. have four chromosomes. B. have four loci. C. have four alleles. D. have four genes. E. produce four cells during meiosis.
The movement of molecules across a membrane from an area of lower concentration to an area of higher concentration with the expenditure of energy is called ________.
A. facilitated diffusion B. active transport C. osmosis D. passive diffusion