Sea stars are not sensitive to desiccation and hence are found in the high intertidal
Indicate whether the statement is true or false
F
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How do scientists determine the annealing temperature used in PCR reactions?
a. It is always 55?C because the DNA polymerase works best at this temperature. b. It is always 55?C because primers anneal best at lower temperatures. c. It is always 60?C because any other temperature would destabilize the DNA. d. It can vary from 55-60?C depending on the primers being used. e. It can vary from 55-60?C depending on the type of DNA polymerase being used.
____detect changes in pressure and convert this stimulus energy into ____
a. Thermoreceptors; action potentials b. Mechanoreceptors; action potentials c. Chemoreceptors; resting potentials d. Photoreceptors; resting potentials e. Osmoreceptors; threshold potentials
Echinoderms do not:a
develop as deuterostomes. b. fall within the group Bilateria. c. show evidence of segmentation. d. fall on the eumetazoan branch of animals. e. fall within the group Deuterostomia.
In the rain forests of Panama, scientists found a colony of tree-dwelling black ants where some individuals had red abdomens. When examined, the scientists determined that the ants with red abdomens were infected with roundworm eggs
Birds would prey on these ants, mistaking their red bellies for berries. In the interactions among the tree-dwelling black ants, the roundworms, and the birds, the roundworms are the A) predators. B) parasites. C) hosts. D) mutualists. E) prey.