Diana is sick in hospital with a severe bacterial infection. she is to be fed antibiotics intravenously at a constant infusion rate, and the doctor knows that the anti-biotic will be eliminated from the bloodstream at a rate proportional to the amount y(t) present in the bloodstream at time t. if the half-life of the anti-biotic in the bloodstream is 3 hours, what rate of infusion should he prescribe to maintain a long-term amount of 400 mgs in diana's bloodstream? 1. infusion rate = 1.694 mgs/min 2. infusion rate = 1.617 mgs/min 3. infusion rate = 1.848 mgs/min 4. infusion rate = 1.771 mgs/min 5. infusion rate = 1.54 mgs/min

If you feel pain while stretching, you should do any of the following except: a. stretch farther. b. back off the stretch. c. find an alternative. d. stop stretching.

The virus genome and viral proteins are assembled into virions (virus particles) during ) the lytic cycle and the lysogenic cycle in all known host organismsb) the lysogenic cycle onlyc) the lytic cycle onlyd) the lytic cycle in all host organisms but the lysogenic cycle only in bacteria

Which of the following best reflects what we know about how the flu virus moves between species? a) the flu virus in a pig is mutated and replicated in alternate arrangements so that humans who eat the pig products can be infected. b) a flu virus from a human epidemic or pandemic infects birds; the birds replicate the virus differently and then pass it back to humans. c) an influenza virus gains new sequences of dna from another virus, such as a herpesvirus; this enables it to be transmitted to a human host. d) an animal such as a pig is infected with more than one virus, genetic recombination occurs, the new virus mutates, the virus is passed to a new species such as a bird, and the virus mutates again and can now be transmitted to humans.