Sickle cell anemia has been traced to what type of mutation?

a. frameshift
b. transposable element
c. deletion
d. addition
e. base substitution


e

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

Which type of species is most likely to go extinct?

a. underharvested b. endemic c. widely distributed d. generalist e. introduced

Biology & Microbiology

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

Biology & Microbiology