In the nitric oxide signaling pathway, nitric oxide activates an enzyme that can convert many molecules of GTP into molecules of cGMP. cGMP is a small molecule that can diffuse through the cytoplasm and bind to an enzyme called protein kinase G (PKG). Binding of cGMP to PKG leads to a change in the confirmation of PKG that leads to its activation. What type of signaling molecule is cGMP?
A. Adapter protein
B. Enzyme
C. Second messenger
D. Scaffold
Answer: C
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An insertion sequence is distinguishable from other mobile genetic elements because
A. it encodes a transposase. B. it is composed of DNA. C. it is highly complex. D. it is smallest.
A 76-year-old man with intermittent fevers has blood cultures drawn three times. The second set is positive and grew out of a Corynebacterium spp. This organism is considered:
a. pathogenic. b. virulent. c. a contaminant. d. normal flora.
Which biome contains the largest tree species in the world?
A) coniferous forest B) deciduous forest C) tropical forest D) arctic forest
Which term applies to the chytrids?
a. aquatic b. parasites of plants c. symbiotic partners of cattle and other herbivores d. saprobes in soil