In translation, when an incoming tRNA with the next amino acid comes into the ribosome, it enters the ________ site, while the tRNA with the growing polypeptide chain is located in the ________ site
Fill in the blank(s) with correct word
A; P
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There was a massive immigration of Irish to the United States in the mid-19th century because of a failure of the Irish potato crop caused by:
A. Trichomonas vaginalis B. Plasmodiuim falciparum C. Phytophora infestans D. Giardia lamblia E. Spudsik emeraldensis
A nasopharyngeal aspirate is cultured on Bordet-Gengou agar, and growth is observed. The colonies are also subjected to a direct fluorescent antibody (DFA) stain, which is also positive. On the basis of these findings, the antimicrobial therapy that should be administered to the pa-tient is:
a. azithromycin. b. gentamycin. c. streptomycin. d. imipenem.
Would ID50 and LD50 necessarily be the same for a given virus? Why or why not?
A. Yes, because the number of viruses that infect 50% of a test population should also kill 50% of that test population. B. No, because a virus may be highly infectious (very low ID50 value) but only marginally lethal (very high LD50 value). A prime example of this is the rhinovirus (common cold virus). C. No, because very few viruses are lethal, yet many are highly infectious. The two values should ALWAYS be different. D. Yes, because what we're actually describing here is infection/killing of individual CELLS, not of entire organisms. If a cell is infected, it will always be killed.
Blood returning to the mammalian heart in a pulmonary vein will drain first into the
A. vena cava. B. left atrium. C. right atrium. D. left ventricle. E. right ventricle.