Action potentials move along axons _____
A) more slowly in axons of large than in small diameter
B) by activating the sodium-potassium "pump" at each point along the axonal membrane
C) more rapidly in myelinated than in non-myelinated axons
D) by reversing the concentration gradients for sodium and potassium ions
C
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If plants did not produce vascular tissue they would be limited to a few millimeters in height
A. true B. false
Cells are genetically programmed to die, responding to cell signals that can come from outside or inside the cell. This process is called necrosis and is a normal way to regulate cell numbers during fetal development and within tissues and organs after birth
a. true b. false
Which of the following features have not helped Giardia become the most common intestinal parasite?
A) A tough cyst form that resists chlorine disinfection used for municipal water treatment, UV light, and freezing. B) Ingesting as few as 10 cysts is sufficient to establish infection. C) It can be transmitted via fecal-oral route, via contaminated fomites, or from direct contact with an infected patient. D) No drugs are currently available for treatment. E) It lives in animals other than humans.
Compare and contrast Yersinia pestis and Francisella tularensis with respect to clinical manifestations, mechanisms of transmission, reservoirs, and pathogenesis.
What will be an ideal response?