Bison are a ________ species in the prairie, helping to maintain the grasses, opening water holes and wallows, and creating the ecological framework for the prairie ecosystem
Fill in the blank(s) with correct word
keystone
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Are superantigen reactions beneficial or harmful to the host? What is different about a superantigen reaction compared to normal antigen-host cell interactions?
What will be an ideal response?
Red-green color blindness is a sex-linked recessive trait in humans. If a non-carrier female (homozygous for the nonmutant allele) mated with an affected man, what would be the expected outcome(s)?
A. None of the sons would be affected. B. Half the sons would be color blind. C. None of the daughters would be affected. D. None of the offspring (sons or daughters) would be color blind. E. Half of the sons would be color blind, and none of the daughters would be color blind.
Exchange of nutrients and gases between blood and tissues is the primary function of
A) arterioles. B) epicardium. C) arteries. D) capillaries. E) veins.
CD4+ T cells are activated by
A) interaction between CD4+ and MHC II. B) interaction between TCRs and MHC II. C) cytokines released by dendritic cells. D) cytokines released by B cells. E) complement.