A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to _____
A) respond to T-independent antigens
B) lyse tumor cells
C) stimulate a cytotoxic T cell
D) interact with a class II MHC-antigen complex
D
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Why is the secondary immune response stronger in regard to antibodies?
What will be an ideal response?
The purpose(s) of the pulmonary circuit in a closed circulatory system is to
a. collect and distribute blood within the heart. b. take blood to and from all parts of the body. c. take blood to and from the lungs. d. collect and distribute blood within the heart and take blood to and from all parts of the body. e. take blood to and from all parts of the body and take blood to and from the lungs.
Lactose intolerance is caused by a(n) ____
a. nucleotide substitution that prevents lactose production b. variant manifestation of galactosemia c. accumulation of galactose-1-phosphate d. inability to digest lactose e. excess in lactose production
Which of the following is NOT an example of a heterotroph?
a) mushroom. b) leopard. c) grass. d) human.