You are in charge of water quality for your city's water treatment plant. Of the methods at your disposal, which will be the most efficient and cheapest method of determining the number of viable bacteria in the water coming out of your plant?
A. Direct counts using a microscope and a counting chamber.
B. Using a Coulter counter machine.
C. Performing serial dilutions of your samples and doing spread plate counts.
D. Using membrane filtration followed by placing the membrane in a growth medium for colony counts after incubation.
E. Biochemical analysis of secondary metabolites in the water that are given off by bacteria.
D
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Which one of the following ribosomal subunits has three different pieces of rRNA in it?
A. 30S B. 40S C. 50S D. 60S
Which of the following contain enzymes, are the
main organelles of intracellular digestion, and can digest whole cells? a. Golgi bodies b. vesicles c. peroxisomes d. lysosomes e. endoplasmic reticula
The fetal period is characterized by ________
A) the formation of organ systems B) neurulation C) germ layer formation D) growth and preparation of fetal organ systems for their eventual functions
Many new species of desert lizards have arisen from a nonnative population which was introduced into the American
southwest. This example best describes:a. the effects of climatic change. b. sympatric speciation. c. allopatric speciation. d. adaptive radiation. e. microevolution.