Autoimmunity is:
a. an automatic response to an antigen.
b. a failure of self cell recognition.
c. a reaction to environmental antigens.
d. a normal response to infection.
e. a response between the autonomic nervous system and the immune system
B
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The group that is the most inclusive and has recently been added to the classification scheme is ____
a. animalia b. kingdom c. eukarya d. protista e. domain
Some plant secondary metabolites are used as______________
a. fuel c. textiles b. medicines d. flooring
What is the agricultural significance of root nodules on plants?
1.The nodules help hold soil in place so there is less erosion.
2.The nodules place nitrogen in the soil, so that less fertilizer is required.
3.The nodules increase the surface area of the root for water absorption, so less irrigation water is needed.
4.Root nodules would play no role in agricultural plants.
If the partial pressure of oxygen (pO2) in a man's blood plasma decreased below that in his red blood cells, what would be the result?
A. More oxygen would diffuse into his red
blood cells and be transported throughout his
body.
B. Oxygen would diffuse out of his red blood
cells, and less oxygen would be transported
throughout his body.
C. The concentration of oxygen would be the
same in red blood cells and blood plasma.