Bacterial encephalitis and meningitis are difficult to treat because
A) no medications exist for treatment of these infections.
B) antibiotics damage nervous tissue.
C) many antibiotics cannot penetrate the blood-brain barrier.
D) the infections move along peripheral nerves.
E) it is very difficult to determine the causative microbe.
C
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Which mechanism allows certain viral pathogens to evade the vertebrate immune system?
A. becoming a symbiont B. becoming nonvirulent C. frequent changing of surface antigens D. becoming metabolically inactive E. becoming a spore
The antidiuretic hormone
a. controls levels of GH. b. influences levels of LH. c. influences levels of FSH. d. reduces urine output. e. causes contractions of the uterus
What term refers to the similarity between parents and offspring and what term refers to the lack of similarity between parents and offspring?
What will be an ideal response?
at what stage does a developing sperm cell begin to grow a tail?
What will be an ideal response?