Cyclospora cayetanensis has, so far, not been identified with an animal source
Indicate whether this statement is TRUE or FALSE.
TRUE
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Depletion of a resource by one species, which lowers the availability of that resource to other species, is an example of:
A. niche divergence. B. direct competition. C. indirect competition . D. predation. E. parasitism.
A tumor is actively producing both VEGF and FGF, factors associated with angiogenesis. However, no network of blood vessels to the tumor has been established in spite of the fact that blood vessels are nearby. This observation most likely suggests that
A) the VEGF and FGF are not functional. B) angiogenesis inhibitors are in greater concentration. C) only one of the molecules is active, not both. D) angiostatin is not produced by the cancer cells. E) the tumor is metastatic.
Which of these events occurs specifically in the embryo and not the fetus?
A) Hair growth B) Maturation of the respiratory system C) Neural tube formation D) Bone replaces cartilage
During mitosis, the rate of microtubule turnover
a. decreases. b. stays the same. c. doubles. d. increases five- to tenfold.