In which of the following do both amino acids contain a sulfur atom?
A) cysteine and glycine
B) cysteine and methionine
C) histidine and methionine
D) phenylalanine and tryptophan
B
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Which of the following is evidence that Earth's history is not short?
A. rates of seafloor spreading compared to the width of the Atlantic Ocean B. thousands of isotopic ages measured by different methods C. millions of layers of light- and dark-colored sediment that record yearly cycles D. a 4-billion-year age on a rock in Canada E. All of these choices are correct.
The same cold front typically produces more rain over Kentucky than over western Kansas
a. True b. False
What is the only form of heat transfer that can operate in a vacuum?
A) conduction B) convection C) radiation D) advection
Cultural eutrophication results from
A. Natural sediment and nutrient levels B. Human activity C. Natural topography D. A change in animal life as well as plants E. The disappearance of tributary streams