Ammonium is converted to nitrates (NO3-) by this process
A) nitrification
B) nitrogen fixation
C) nitrofaction
D) calcification
A
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During which stage of meiosis will the pairs of homologous chromosomes line up?
A) metaphase I B) metaphase II C) metaphase D) anaphase I E) prophase II.
Opening and closing of the stomata:a
occur during prolonged periods of drought. b. occur when there is a high concentration of carbon dioxide in the leaf. c. are under hormonal control
d. are triggered by darkness. e. are controlled by the changes in shape of the companion cells.
Which one of the following virulence factors contributes most to the spread of disease in the body?
A) endotoxin production B) siderophore production C) hemolysin D) hyaluronidase
?
Figure 33.6
The accompanying figure shows areas of referred pain that indicate an internal organ is damaged. Which letter corresponds to heart damage?
A. A B. B C. C D. D E. E