What was a significant outcome of the Miller and Urey experiment?
a. They demonstrated natural selection.
b. They were the first to synthesize living cells.
c. They proved that life did not originate on Earth.
d. They proved that the iron-sulfur world hypothesis was false.
e. They synthesized organic molecules from inorganic materials.
e
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Double-stranded DNA will separate into two strands when exposed to
A. high temperature. B. high pH. C. low temperature. D. low salt. E. high temperature AND high pH.
Fossils are most likely to be found in ________
a. shale or sandstone b. obsidian or basalt c. granite d. pumice
The common ancestor to snails, insects and vertebrates lived approximately ________ years ago
a. 85 million b. 275 million c. 500 million d. 110 million e. 400 million
Why is the acid-fast stain clinically useful?
A) It identifies the causative agents of leprosy and tuberculosis. B) It identifies the causative agent of strep throat and Scarlet fever. C) It confirms that a single dose of antibiotics is enough to kill the bacteria. D) It confirms the results of the Gram stain. E) It identifies the causative agent of certain fungal infections.