Intestinal parasites can be identified by observing stool samples for the presence of
A) cysts.
B) antibodies.
C) LPS.
D) blood.
Answer: A
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A population bottleneck...
a. Results from a severe decrease (in) population size. b. Can lead to increase in inbreeding. c. Can occur from a disease or natural disaster. d. Can lead to a decrease in gene diversity within a population. e. Includes all of the above.
When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?
A. Phytochrome in the taller plant absorbs most of the red light. B. Auxin absorbs mostly far-red light. C. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll. D. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed. E. Shade is enriched in far-red wavelengths of light.
Which soil region tends to accumulate mineral ions but relatively little organic matter, and is generally penetrated by mature tree roots?
a. A horizon b. B horizon c. C horizon d. D horizon e. O horizon
The abdominal segments of Drosophila have no appendages. Loss of function of bithorax genes results in appendages forming in these abdominal segments. Therefore, __________
A) bithorax mutations are necessarily recessive B) bithorax genes normally activate appendage-forming genes C) ultrabithorax usually acts to oppose bithorax genes D) bithorax normally activates a gene that negatively regulates appendages in the abdomen E) expression of bithorax wild-type genes suppresses all appendage formation