Three fossils are found in undisturbed layers of rock, or strata. Fossil A is closest to the Earth's surface and Fossil C was deeper than Fossil B. Given this limited data, what assumptions can you make about these fossils?
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Fossils found deeper within the Earth's crust are typically deposited first and therefore considered to be older. Those found closer to the surface were deposited later in time and are "younger" fossils. Scientists correlate fossil finds from different parts of the world to determine in what order the fossils were deposited. The exact time of deposition is not determined by this method of relative dating. One might assume that Fossil C is of the oldest organism, Fossil B is intermediate in age between C and A, and Fossil A is of an organism that lived more recently than the others.
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Which substances are the most plentiful biological
molecules in the biosphere? a. carbohydrates b. salts and minerals c. proteins d. fats e. nucleic acids
Aminoglycosides
A. attach to the 30S ribosomal subunit and disrupt protein synthesis. B. damage cell membranes. C. block peptidases that cross-link glycan molecules. D. destroy peptidoglycan. E. are metabolic analogs of PABA and block folic acid synthesis.
________ lakes are nutrient-rich and tend to have large populations of algae.
A. Eutrophic B. Temperate C. Stratified D. Oligotrophic
The smallest free-living microbes are (mycobacteria/mycoplasmas/Chlamydophila)
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