All of the following diseases are caused by arbovirus EXCEPT
A) St. Louis encephalitis.
B) eastern equine encephalitis.
C) West Nile encephalitis.
D) primary amebic meningoencephalitis (PAM).
E) None of the answers is correct; all of these diseases are caused by arbovirus.
D
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Oxygen moves from alveoli to the bloodstream
a. because the concentration of oxygen is greater in alveoli than in the blood. b. mainly due to the activity of carbonic anhydrase in the red blood cells. c. because of its attraction to hemoglobin. d. to counter the high concentration of CO2 in the blood. e. because of all of these.
Evidence for the evolution of antibiotic resistance in bacteria has been evaluated ________
A) in populations of bacteria within individual patients B) in studies comparing newly diagnosed patients v. patients who have relapsed after antibiotic treatment C) in studies comparing the fraction of patients with resistant bacteria and society-wide use of antibiotics D) in all of the above examples E) in no empirical studies; there is no evidence that antibiotics act as a selective agent
Which of the following organelles does NOT contain its own DNA?
A. Nucleus B. Chloroplast C. Rough endoplasmic reticulum D. Mitochondrion
Acetylcholine acts at a GPCR on heart muscle to make the heart beat more slowly
It does so by ultimately opening K+ channels in the plasma membrane (as diagrammed in Figure Q16-32), which decreases the cell's excitability by making it harder to depolarize the plasma membrane. Indicate whether each of the following conditions would increase or decrease the effect of acetylcholine. A. addition of a drug that stimulates the GTPase activity of the G? subunit B. mutations in the K+ channel that keep it closed all the time C. modification of the G? subunit by cholera toxin D. a mutation that decreases the affinity of the ?? complex of the G protein for the K+ channel E. a mutation in the acetylcholine receptor that prevents its localization on the cell surface F. adding acetylcholinesterase to the external environment of the cell