Choose the letter of the best match from the following:A. abscisic acidB. auxinC. ethyleneD. cytokininE. gibberellinIts defoliant effects were first noticed when it leaked from gas lights; later found to be produced by plants themselves.
Fill in the blank(s) with the appropriate word(s).
Answer: C
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The aminoglycosides and tetracycline specifically target the ________ interfering with ________.
A. cell membrane enzymes; transpeptidation step of peptidoglycan synthesis B. tRNAs; protein synthesis C. topoisomerases; DNA replication D. 30s ribosomal subunit; protein synthesis
Urea is _____
A) insoluble in water B) more toxic to human cells than ammonia C) the primary nitrogenous waste product of humans D) the primary nitrogenous waste product of most birds E) the primary nitrogenous waste product of most aquatic invertebrates
Some species of Streptococcus, when grown on blood agar, produce a complete hemolysis with the formation of a clear zone around the colony; this is referred to as ________.
A. alpha-hemolysis B. gamma-hemolysis C. beta-hemolysis D. None of the choices are correct.
A benefit of alternate splicing of introns out of mRNAs is that
A) it maximizes the number of introns. B) it increases the number of proteins that the genome encodes. C) it lowers the risk of infection. D) it speeds transcription.