The Kirby-Bauer method of antimicrobic testing was performed on a Haemophilus culture. A disc on the plate contained ampicillin at a concentration of 10 ?g and the zone of inhibition was 19mm. A disc on the plate contained ciprofloxacin at a concentration of 5 ?g and the zone of inhibition was 20 mm. A disc on the plate contained loracarbef at a concentration of 30 ?g and the zone of inhibition was 21 mm. A disc on the plate contained tetracycline at a concentration of 30 ?g and the zone of inhibition was 26 mm. Based on this information which anti-microbic would the most effective choice for chemotherapy.
A) Ampicillin
B) Ciprofloxacin
C) Loracarbef
D) Tetracycline
C) Loracarbef
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Fall leaf color on deciduous trees is a result of
A. the production of more accessory pigments because of the cooler temperatures. B. the reduction in the production of accessory pigments. C. cessation of chlorophyll production, which allows the accessory pigments to be revealed. D. the increased angle of the sun during the fall, which reflects more of the accessory pigments.
Summation of EPSPs and IPSPs occurs at the _____ of the neuron
a. dendrites b. trigger zone c. nodes of Ranvier d. axon terminals
Transcription
a. involves both strands of DNA as templates. b. uses the enzyme DNA polymerase. c. results in a double-stranded end product. d. produces three different types of RNA molecules. e. fits all of these descriptions.
Neurological diseases that result from West Nile virus infection include which of the following?
a. aphasia b. encephalitis c. encephalitis and meningitis d. meningitis and West syndrome