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Unformatted text preview: 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 membrane. 6. A chemoautotroph gets its energy from CO2 and its carbon from organic compounds. 7. Functionally, the flagella of prokaryotes and eukaryotes are the same, but structurally they’re different. 8. Endospores may form within a bacterial cell during unfavorable conditions. 9. One disadvantage of electron microscopy: It’s restricted to nonliving samples. 10. One disadvantage of light microscopy: Magnification is restricted by light wavelength. Key: 1b, 2b, 3a, 4a, 5b, 6b, 7a, 8a, 9a, 10b ...
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This note was uploaded on 02/24/2010 for the course BIO 311 C taught by Professor Mcclelland during the Spring '09 term at University of Texas at Austin.
- Spring '09