Which of the following diseases is considered an emerging disease because it was unknown before 1987?
A) anaplasmosis
B) Brill-Zinsser disease
C) murine typhus
D) Rocky Mountain spotted fever
E) lymphogranuloma venereum
A
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An episome is
A. a plasmid that can make bacterial cells resistant to antibiotics. B. a plasmid that gives bacteria the ability to degrade toluene. C. a plasmid that can exist either autonomously in the cytoplasm or as part of a chromosome. D. a plasmid that can turn a bacteria that is harmless into a strain that can cause disease. E. a plasmid that gives bacteria the ability to exchange DNA with another bacterial cell.
Scientists are attempting to genetically modify rice so that it will not incorporate ____ into the grains
a. arsenic b. methylmercury c. chelated iron d. lead e. uranium hexafluoride
What is the correct order for the following events that follow a nerve impulse along a sympathetic neuron to innervate
the heart? 1) G protein activates adenylyl cyclase 2) Neuron releases norepinephrine 3) Cyclic AMP activates protein kinase 4) Receptor activates G protein 5) Protein kinase phosphorylates Ca2+ channels 6) Receptors activated on the membrane of the cardiac muscle a. 1, 3, 4, 5, 2, 6 b. 5, 3, 4, 1, 2, 6 c. 6, 2, 4, 1, 3, 5 d. 2, 6, 4, 1, 3, 5
e. 2, 3, 4, 1, 6, 5Which of the following would be most affected by a mutation that prevented cells from forming tight junctions?
A) attachment of cells to the surrounding matrix B) direct flow of water and small molecules from one cell to another C) integrity of the inner lining of the digestive tract D) attachment of the cytoskeleton to the inside of the plasma membrane