Human sweat has antimicrobial activity due to
A. production of an antimicrobial peptide called cathelicidins.
B. production of low molecular weight compounds that chelate free iron.
C. production of low molecular weight compounds that maintain an alkaline pH.
D. competition with normal sweat gland flora.
Answer: A
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The tropical diseases such as African sleeping sickness, Chagas disease, and leishmaniasis are caused by
A. foraminifera. B. sporozoans. C. phytomastigotes. D. trypanosomes. E. oomycetes.
400 micrograms a day of folic acid are recommended for all women of child-bearing age. Folic acid helps prevent neural tube defects in the first weeks of pregnancy, before most women even realize they are pregnant (and almost half of pregnancies in the U.S. are unintended). Knowing that folic acid promotes proper neural tube closure, which disease can be prevented by this supplement?
A. Spina bifida -- the vertebrae are unfused and may allow the spinal cord to protrude outside the body B. Horseshoe kidney -- the two kidneys are fused together across the midline C. Esophageal atresia -- the esophagous ends in a pouch, unconnected to the stomach D. Chronic otitis media -- frequent ear infections that can result from blocked eustachian tubes Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the neural tube? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A circular DNA molecule with two restriction enzyme cut sites will yield three fragments on digestion
Indicate whether the statement is true or false
You are employed by the Natural History Museum of Chicago as a wildlife biologist. You recently completed an expedition to Indonesia where you discovered a new and very colorful species of beetle. Based on observations, you hypothesize that sexual selection may be playing a role in the evolution of this species. Which of the following observations would support your hypothesis?
A. Males defend territories. B. Female preference for larger, brighter males. C. Male beetles are bigger and more brightly colored than females. D. All of the above observations would support your hypothesis.