Which of the following cytokines promotes the development of a cell-mediated immune response?

A. alpha interferon
B. chemokines
C. tumor necrosis factor (TNF)
D. IL-4 (interleukin-4)
E. IL-12


Answer: E

Biology & Microbiology

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Fragile X syndrome is caused by ____ on the X chromosome in humans

a. the presence of CCG repeats b. mutations within CCG repeats c. deletion of CCG repeats d. overreplication of CCG repeats e. the absence of CCG repeats

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How does a transcribable vector differ from an expression vector?

What will be an ideal response?

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When during the cell cycle are chromosomes visible?

a. only during interphase b. only when they are being copied c. only during the G phase d. during mitosis e. Chromosomes are always visible.

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Which of the following statements about predation are true? Check all that apply.

A. Batesian mimicry is not a coevolutionary adaptation to predation. B. Predation can induce coevolutionary changes in prey species. C. Animal predation on plants is called herbivory. D. Removal of a predator often leads to increased community stability. E. Cycling of predator and prey populations is not commonly observed.

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