Several hours after a meal, glucagon increases blood glucose levels by activating an enzyme that breaks down glycogen, which is stored primarily in the
A) liver.
B) pancreas.
C) small intestine.
D) kidneys.
E) heart.
A
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A young graduate student is trying to identify new species of bacteria based on the criteria of Ernst Mayr
She is having a lot of trouble with this method, and then suddenly realizes that she can't use Mayr's definition of a species when it comes to bacteria. Why? (Select all correct choices.) A. DNA can be passed between bacteria of different species via horizontal gene transfer. B. DNA is never passed between bacteria of different species. C. Bacteria do not reproduce sexually and/or do not undergo meiosis. D. Bacteria form pili and, as a result, reproduce sexually.
The deep-sea soft-bottom food chain is: ____
a. infauna ? meiofauna ? bacteria b. bacteria ? meiofauna ? infauna c. meiofauna ? bacteria ? infauna d. meiofauna ? infauna ? bacteria
Osmotic concentration in the loop of Henle increases as NaCl as water moves out.
a. true b. false
Regarding Borrelia burgdorferi and Lyme disease, which one of the following is most accurate?
A. Borrelia burgdorferi infects a larger percentage of the rodent reservoir in western states, such as California, than in northeastern states, such as New York B. Pathogenesis of Lyme disease is based on the production of an exotoxin that induces interleukin-2 production by T-helper cells C. The vaccine against Lyme disease contains the capsular polysaccharide of all four serotypes as the immunogen D. Close family members of those infected with B. burgdorferi should be given ciproflaxacin E. Borrelia burgdorferi is transmitted to human by the bit of ticks of the genus Ixodes