What initiates the immune response?  

A.  suppressor T cells
B.  cytotoxic T cells
C.  mediator T cells
D.  inducer T cells
E.  helper T cells


E.  helper T cells

Biology & Microbiology

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multi-cell embryo during a. meiosis. b. parthenogenesis. c. embryonic induction. d. cleavage. e. invagination.

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A bacteriophage that has integrated into the bacterial chromosome is called a prophage

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What describes the movement of substances down their concentration gradients?

A. Active transport B. Saturation C. Diffusion D. Bulk transport

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