During parturition, mechanical pressure caused by the movement of the fetus through the uterus causes the release of
____ from the ____.
a. HCG; hypothalamus
b. oxytocin; posterior pituitary
c. oxytocin; hypothalamus
d. HCG; posterior pituitary
e. oxytocin; adrenal cortex
ANSWER: b
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Which of the following species of Mycobacterium causes a chronic disease of the skin, mucous membranes, and nerve tissue but has not yet been cultivated in vitro?
a. M. paratuberculosis b. M. lepraemurium c. M. phlei d. M. leprae
How are eukaryotic transcripts modified before they are used in protein synthesis?
What will be an ideal response?
A child may be given the vaccine for chickenpox. If the child goes to school and plays with other children who have the chickenpox virus, the vaccinated child will not get sick. Why is this?
A) Vaccines introduce a friendly virus into cells so they cannot be infected with a second virus. B) Vaccines stimulate macrophages to work extra hard to fight infections. C) Vaccines produce a primary response in which memory cells are generated that respond rapidly in a second exposure. D) Vaccines act like antibiotics so that any organism in the body will be destroyed before the immune system has to respond.
Escherichia coli has not been found to be pathogenic in humans.
Answer the following statement true (T) or false (F)