__________ infections are the most common type of nosocomial infections.
A) blood
B) respiratory
C) postsurgical wound
D) urinary tract
D) urinary tract
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Which of the following is NOT considered to be a key derived morphological innovation within the
vertebrate lineage?
a. neural crest cells b. notochord c. bone d. vertebrae e. cranium
________ are organic compounds that the body needs for metabolic purposes but is unable to produce for itself.
a) carbohydrates b) lipids c) vitamins d) proteins
Two species regularly come into contact and form hybrids that have higher fitness than either of the parental species. What are some likely consequences of regular hybridization between these species? Check all that apply.
A. complete reproductive isolation of the two original species B. evolution of a third species C. reinforcement of prezygotic isolating mechanisms D. extinction of one or both of the parental species. E. increased gene flow between the parental species
If Leydig cells were unable to respond to GnRH, what effect would this have on spermatogenesis?
A. Spermatogenesis would be unaffected. B. Spermatogenesis would increase. C. Spermatogenesis would decrease. D. Spermatogenesis would stop. E. The overall process of spermatogenesis would take longer.