Aminoacyl-tRNA synthetases catalyze covalent addition of ________ to tRNAs.
Fill in the blank(s) with the appropriate word(s).
amino acids
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The member of the domain Bacteria whose genome shows it to be most closely related to the Archaea is ________.
A. Synechococcus B. Thermotoga C. Aquifex D. Deinococcus
Using the NeoR/Tk system of introducing gene replacements into mice (as described in the text), which of the following would identify those mouse cells that were the result of homologous recombination?
A. NeoR only B. Tk only C. NeoR and Tk D. Neither NeoR or Tk
Which type of plant signaling molecule is similar in structure to aspirin?
a. abscisic acid b. ethylene c. salicylic acid d. jasmonate e. oligosaccharin
Plant cells produce oxygen gas
a. by splitting carbon dioxide. b. during respiration. c. by splitting ribulose bisphosphates. d. by splitting molecules of water. e. by breaking down glucose