What general type of stain is used to separate types of bacteria based on their cellular structures?
a. Differential
b. Acidic
c. Negative
d. Simple
Answer: a. Differential
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Cancer is often the results mutations that involve ________.
A. Genes in the mitotic spindle B. Proto-oncogenes mutating and becoming oncogenes C. Oncogenes mutating and becoming proto-oncogenes D. Both proto-oncogenes and oncogenes mutating
When considering time and temperature as factors in microbicidal activity,
A. time is not a factor, only temperature. B. they are inversely proportional to each other. C. they are directly proportional to each other. D. they must be of equal value e.g. 30 minutes at 30°C.
Zebra mussels were introduced into Lake St. Clair around 1988
The table lists the population densities (in grams dry weight per square meter of lake bottom) of native unionid mussels and exotic zebra mussels in the lake before and after this introduction. Both groups feed by filtering small particles from the water. Based on the information given, which of the following best describes the likely relationship between zebra mussels and unionids? Year Unionids Zebra mussels 1986 4.5 0.0 1990 3.7 4.6 1992 1.3 3.4 1994 0.1 3.2 A) Zebra mussels and unionids have no effect on each other. B) Zebra mussels exert a density-independent control on unionid populations. C) Zebra mussels exert a density-dependent control on unionid populations. D) Unionids exert a density-dependent control on zebra mussel populations. E) Unionids exert a density-independent control on zebra mussel populations.
Imagine an extinction event that results in a great loss of taxa but only an insignificant loss of morphological diversity. How has this mass extinction pruned the "tree of life?"
a. Big "branches" of the tree of life have been removed. b. Many exterior "twigs" have been pruned but not big branches. c. A single, taxon-rich, but morphologically homogenous, "branch" has gone extinct. d. A and C. e. B and C.