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
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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
How does a transcribable vector differ from an expression vector?
What will be an ideal response?
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.
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.