Francisella philomiragia differs from F. tularensis in that it:
a. is oxidase-negative.
b. is hydrogen sulfide–positive.
c. does not hydrolyze gelatin.
d. does not grow in 6% sodium chloride.
B
F. philomiragia differs from F. tularensis biochemically. F. philomiragia is oxidase-positive by Kovac's modification, and most strains produce hydrogen sulfide in triple sugar iron agar me-dium, hydrolyze gelatin, and grow in 6% sodium chloride. No strains of F. tularensis share these characteristics.
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During this phase of the cell cycle the nuclear membrane starts to disassociate:
A. Metaphase B. Prometaphase C. Telophase D. Anaphase E. Prophase
One generalization of the cell theory is that ____.
A. all cells have a nucleus B. all cells have cell walls C. the cell is the smallest unit that displays the properties of life D. cells can arise from nonliving matter E. all cells are microscopic
Cytotoxic T-cells
A. lack specificity for a target cell. B. secrete interleukin-2 to stimulate B and T-cells. C. stimulate B-cell proliferation. D. secrete granzymes and perforins that damage target cells. E. All of these choices are correct.
Answer the following questions true (T) or false (F)
1. When a neuron is resting, it has a higher concentration of Na+ ions inside the cell membrane than outside. 2. The action potential moves across the synaptic cleft as an electrical signal. 3. The parasympathetic division of the autonomic nervous system would be key in preserving an individual who is escaping from a dangerous situation.