How does a specific aminoacyl-tRNA synthetase recognize its tRNA?
A) by the anticodon loop of tRNA
B) by the residue at the 3' end of the tRNA
C) by the residue at the 5' end of the tRNA
D) By a nucleotide sequence on the tRNA which may or may not include the anticodon loop.
A
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Which of the following species is the oxidizing agent? 2 CuBr ? 2Cu + Br2
A) Cu B) CuBr C) Cu+ D) Br- E) Br2
It takes ________ energy to produce aluminum from ore than to obtain it from recycled sources
A) 7 times more B) roughly the same amount of C) 20 times less D) 7 times less E) 20 times more
A porphyritic igneous texture indicates that
A. the rock cooled slowly. B. there was water in the magma. C. the rock broke apart as it flowed. D. the ash and pumice were hot and became compacted. E. the rock cooled slowly and then quickly.
A falling skydiver of mass 100 kg experiences 500-N air resistance. The acceleration of the skydiver is
A) 0.2 g. B) 0.3 g. C) 0.4 g. D) 0.5 g. E) more than 0.5 g.