Fossils in the deepest layers of sedimentary rocks are typically ____ compared to fossils in the more shallow layers
a. relatively large and fragile
b. those that resemble living organisms
c. those that resemble dinosaurs
d. larger and more complex
e. relatively small and simple
ANSWER: e
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Natural selection
A. is evolution. B. is a key mechanism that causes evolution to happen. C. occurs at the population level. D. results in reproductive success. E. occurs at the population level and is a key mechanism that causes evolution to happen.
Which fish bones are homologous with an amphibian's front and hind limbs?
a. Tail, pectoral fin b. Pectoral fin, pelvic fin c. Pelvic fin, dorsal fin d. Pectoral fin, dorsal fin e. Gills, pelvic fin
In the whole-genome shotgun method, the genome is fragmented and individual fragments are
sequenced. How do we determine the order of the nucleotides in the intact chromosome?
a. The fragmentation is done in a very systematic way such that the physical arrangement of fragments is readily apparent. b. The sequence of the ends of the fragments overlap with the ends of other fragments. c. We supplement our information with data from a different technique to determine the final chromosome arrangement. d. DNA hybridization assays are conducted to determine the physical arrangement of the genes on the chromosome. e. After sequencing, the fragments are labeled and used as probes in a Southern blot.
One molecule of sodium nitrate (NaNO3) contains ____ atoms.
A. 6 B. 5 C. 4 D. 3