Geckos are able to cling to vertical walls due to ____
a. polar covalent bonds
b. van der Waals forces
c. ionic bonds
d. hydrogen bonds
e. nonpolar covalent bonds
B
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Selenite broth serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others c. Inhibition of normal flora and selection of enteric pathogens d. Enrichment for enteric pathogens such as Salmonella and others
In DNA, cytosine bonds to guanine. In RNA, cytosine bonds to
a. thymine. b. cytosine. c. uracil. d. guanine. e. adenine.
Which of the following is a density-independent factor limiting human population growth?
A) social pressure for birth control B) earthquakes C) plagues D) famines E) pollution
The reduction of atmospheric nitrogen to ammonia is called ________.
A. ammonification B. nitrification C. nitrogen fixation D. denitrification