On what basic physical principle does radiometric dating rely?
What will be an ideal response?
Unstable isotopes decay into either other elements or different isotopes of the same element. Each isotope decays at a constant rate, and the resultant half-life can be used to estimate the age of rocks and once-living materials.
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Members of the hyperthermophilic anaerobe lineage are known to reside in marine and terrestrial geothermal habitats.
Answer the following statement true (T) or false (F)
Which of the following types of organisms would be most likely to organize its genome into a nucleoid region?
A. fungi B. plants C. protists D. archaea
Answer questions 67–71 in reference to the four groups of fungi
listed below. a. Zygomycetes b. Ascomycetes c. Basidiomycetes d. Glomeromycetes M 67. The common mushroom bought in the average supermarket is most likely a member of this group. D 68. Penicillium, the source of antibiotics, is a member of this group. M 69. The yeast used in the fermentation of grape juice to produce the wines of the world is a member of this group. D 70. The common black bread mold is a member of this group. M 71. The delicious, highly-prized truffle is a member of this group.
If a typhoid fever outbreak has occurred, which of the following statements is true?
a. Proteus colonies of Enterobacteriales are probably present. b. Shigella species are present and may have been transmitted by cattle. c. Salmonella is present, and the serovars may be differentiated by antigenic analysis. d. Escherichia coli bacteria are present, probably passed on by infected human waste in the water supply.