Generally, vaccines are used to stimulate the immune system by providing antigens of potential pathogens. What is the typical composition of a vaccine?
What will be an ideal response?
inactivated or attenuated viruses
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The glial cells associated with phagocytosis to fight infection and remove debris are the
A) microglia. B) oligodendrocytes. C) Schwann cells. D) myelin sheath cells. E) astrocytes.
Lyme disease is an example of a disease
A. that is due to a greater degree of interaction between humans and tick-carrying animals. B. that is due to a decline in vaccinations. C. that is due to a mutation in the human genome. D. that is due to climate change leading to a greater mosquito population.
The change in the chromosomes depicted between the top and the bottom in the accompanying figure represents a(n)
a. inversion b. duplication c. reciprocal translocation d. deletion e. Philadelphia chromosome
The most widely accepted and supported model that explains the movement of phloem sap in flowering plants is the
____ mechanism.
a. cohesion-tension b. translocation c. pressure flow
d. osmosis e. transpiration