What is the role of the iris?
a. to adjust the opening of the pupil in response to light
b. to make the opening of the pupil larger
c. to make the opening of the pupil smaller
d. to protect the surface of the eye
A. to adjust the opening of the pupil in response to light
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Which of the following is most logical from a
health perspective? a. Light skin and little exposure to sun. b. Light skin and extensive exposure to sun. c. Dark skin and little exposure to sun. d. Dark skin and lots of exposure to sun. e. Light skin and little sun, or dark skin and lots of sun
How might blocking angiogenesis have a negative impact as a cancer treatment?
a) by creating a higher oxygen tension in the tissue b) by concentrating tumor cells at a particular location in the body c) by creating a more O2-deficient environment for the tumor cells d) by driving tumor cells to seek out other sites in the body
Which of the following bacterial genera plays an important role in environmental nitrogen cycles?
A) Nitrobacter B) Rhizobium C) Azospirillum D) both Nitrobacter and Rhizobium E) Nitrobacter, Rhizobium, and Azospirillum
Which one of the following does NOT belong with the others?
A) bacitracin B) cephalosporin C) monobactam D) penicillin E) streptomycin