Floating objects accidentally lost at sea are called ________.

A. jetsam
B. toxicants
C. flotsam
D. garbage patches


Answer: C

Environmental & Atmospheric Sciences

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A detrital sedimentary rock with large angular fragments is called a(n) ________

A) shale B) conglomerate C) arkose sandstone D) breccia

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Which of the following amino acids absorbs UV radiation at 280 nm?

A) phenylalanine B) tryptophan C) tyrosine D) all of these

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Which of the following is true of mRNA?

A) It has a fixed size of 750 nucleotides. B) It has a high concentration. C) It is a long lived molecule. D) Its nucleotide sequence is complementary to that of one strand of DNA.

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By 2020, all of the following will have moved into the top three leading causes of disease worldwide except

A. pneumonia. B. heart disease. C. traffic accidents. D. depression.

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