Specialized symbiotic associations between the roots of plants and fungi are called
A. a mycelial unit.
B. lichens.
C. hyphal associations.
D. mycorrhizae.
E. heterokaryotic junctions.
Answer: D
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The mechanism for reactive oxygen species to cause mutation is
A. bases are oxidized to a variety of different products which might pair with a different base than the original base would have B. thymine bases are dimerized which causes a break in the DNA which is not repaired correctly. C. the reactive oxygen species stabilize different tautomeric forms of the bases causing inappropriate pairing. D. guanine is depurinated by the reactive oxygen species and if it is not repaired can result in any base being inserted.
The contractions within the small intestines that aid in digestion and absorption are known as ____
a. segmentation b. peristalsis c. mass movements d. migrating motility contractions e. haustral contractions
About how many million years ago did humans of the genus Homo first inhabit eastern Africa?
a. 2 b. 4 c. 6 d. 8 e. 10
Anthrax is
A. a zoonosis. B. only seen sporadically in the United States. C. transmitted by contact, inhalation, or ingestion. D. a disease that, in humans, can cause a rapidly fatal toxemia and septicemia. E. All of the choices are correct.