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Quiz 4 - Quiz 4 True(mark a or False(mark b 1 Scientists...

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9-26-08 Quiz 4 True (mark “a”) or False (mark “b”) 1. Scientists have estimated the Earth’s age to be about 45,000,000 years old. 2. Radiometric measurements of isotopic half-life are good for determining the relative ages of fossils. 3. If 11% of a radioactive isotope remains in a bone, its age could be slightly more than the sum of three half-lives of the isotope. 4. A bacterial cell that stains pink/red by Gram staining is considered Gram negative. 5. If the cell in question 4 was Gram positive, its cell wall would also have an outer
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