Which of the following bacteria oxidize nitrite (NO2-) to produce nitrate (NO3-)?
A) Nitrobacter
B) Azospirillum
C) Nocardia
D) Cyanobacter
E) Rhizobium
A
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The eggs of the A. lumbricoides worm are ingested and hatched in the duodenum, penetrate the intestinal wall, and migrate to the hepatic portal circulation. Its geographic distribution and in-fection rate are associated with:
a. institutional crowding. b. poor sanitation. c. day care centers. d. moist warm soil.
Which of the following is NOT a known dysfunction
in the expression of sickle-cell anemia? a. impaired brain function b. rheumatism c. heart failure d. excessive absorption of oxygen causing the cell to swell e. enlarged spleen
A person who has a significant concentration of blood antigens in his or her perspiration and saliva is referred to as a(n) ___.
What will be an ideal response?
A plant researcher wants to construct a synthetic cellulose fiber from 20 glucose molecules. How many molecules of CO2 and glyceraldehyde-3-phosphate are needed to construct the fiber?
A. 20, 60 B. 120, 60 C. 20, 40 D. 120, 40 E. 120, 120