Which of the following does not change gene frequencies in populations?
A) migration B) diet C) mutation D) selection
Answer: B
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Which of the following is not a biological effect associated with endotoxin?
A. Paralysis B. Coagulation C. Fibrinolysis D. Fever
True or False: amino acids with hydrophobic side chains are most often found buried in the interior of folded proteins
A. true B. false
he nervous system of many species of flatworms:A
consists of a single, large ganglion in the anterior end. B. is sometimes referred to as tubelike. C. includes two dorsal nerve cords. D. is diffuse and netlike. E. is a “ladder-type.”
Which of these can be concluded from the figure below?
A) In some years of the study the mean poison ivy biomass decreased to the level it was at the beginning of the study.
B) There were more elevated CO2 plots than control plots.
C) Not all of the increase in mean poison ivy biomass can be attributed to the CO2 that the researcher added.
D) Poison ivy in the experimental plots was more toxic than that in the control plots.