What mineral compound allows bones to resist compression and support body weight?
a. collagen
b. fibronectin
c. hydroxyapatite
d. chondroitin sulfate
e. osteoclast
ANSWER: c
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It is believed that HIV has passed from chimps to humans more than once. This suggests that animal-to-human viral transmissions may be more common than previously thought
What is the best evidence in support of the conclusion that HIV made the chimp-to-human leap more than once? A) HIV has multiple strains, and the virus does not appear to be able to leap from humans back to chimps. B) HIV has appeared on multiple continents. C) Human-to-human transmission of HIV requires direct personal contact that simply could not have resulted in the widespread outbreak we see today. D) Several species are known to have similar viruses resulting in immunodeficiency diseases.
Conifers have been very successful members of the gymnosperms. What are some of the adaptations that have contributed to their success?
What will be an ideal response?
Energy sources are needed for which of the following processes?
I. reproduction II. growth III. development
a. I and II only b. I and III only c. II only d. II and III only e. I, II, and III
In performing a Gram's staining techniques, the counterstain is
A. Methylene blue B. Crystal violet C. Safranin D. Malachite green E. Gram's iodine