Sickle cell anemia has been traced to what type of mutation?
a. frameshift
b. transposable element
c. deletion
d. addition
e. base substitution
e
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A 26-year-old woman has an odorous vaginal discharge, lower abdominal pain, and difficulty urinating. Vaginal secretions are collected and sent to the laboratory for examination 3 hours af-ter collection. No motile organisms are observed on the wet preparation; however, T. vaginalis is suspected. Which one of the following statements explains this discrepancy?
a. The infection is most likely bacterial; therefore a Gram stain should have been performed. b. The specimen should have been refrige-rated before examination; consequently, the organism was compromised. c. The time between collection and the mi-croscopic examination was prolonged, resulting in loss of motility. d. No discrepancy is present; this organism in nonmotile.
The single greatest reservoir(s) of carbon exist(s) in ____
a. the atmosphere b. land food webs c. the ocean d. rocks and sediments e. marine organisms
Which type of species is most likely to go extinct?
a. underharvested b. endemic c. widely distributed d. generalist e. introduced
Match the following prefixes with their relationship to the standard base unit (g, m, L):
Milli A) 1/100 B) 1/1,000,000 C) 1000 D) 1/1000