Biology Praxis FORM 1 Questions and Answers Already Passed

Biology Praxis FORM 1 Questions and Answers Already Passed Which of the following characteristics of a material found on the bark of a tree will most likely prove that the material is a living thing? The material appears to reproduce on its own. Given the DNA sequence 5' ATGCCCTCA 3', which of the following is the correct complementary sequence of messenger RNA? 3' U A C G G G A G U 5' According to evolutionary theory, which of the following individuals has the greatest Darwinian fitness? A woman who lives to be 80 years old, has 6 children and 30 grandchildren, and is in poor health most of her life When caribou migrate, the weaker ones often become the prey of wolves and other carnivores. If the vegetation that the caribou eat is sparse for several consecutive years, which of the following will most likely be true about the wolf population during that same period? The wolf population will initially increase because of an increase in the wolves' food availability. Which TWO of the following are scientific theories? Evolutionary adaptations arise by natural selection. The number of species in an isolated island-like habitat is determined by an equilibrium between the rates of immigration and extinction. A diploid organism has the genotype AaBbCc for three loci, each of which is located on a different chromosome. A normal gamete produced by this organism could have which of the following genotypes? AbC The sciatic nerve from a frog was isolated and placed into a nerve chamber. A recording of an action potential was measured when the nerve was bathed in a solution that mimics the extracellular fluid typically surrounding a cell, and the nerve was stimulated. The recording is shown above. If the toxin TTX, a potent sodium-channel blocker, is added to the bathing solution and the nerve is stimulated using a stimulus of the same strength, what will be the most likely change in the action potential? The action potential will not occur, because depolarization will not occur. Sea star wasting syndrome is decimating some populations of sea stars along the North American Pacific coast. Sea stars are the only natural predator of sea urchins and mussels in some portions of this ecosystem. Which of the following is most likely a concern of scientists studying the ecosystem? Without sea stars, the sea urchin and mussel populations will increase and eliminate other species in the ecosystem. Which of the following statements regarding the water cycle is correct? The water cycle differs from other biogeochemical cycles because most water moves through ecosystems by physical rather than chemical processes. The skeletal structures of the human arm and whale flipper (pectoral fin) are shown above. The arm and flipper are examples of homologous structures Which of the following is required to initiate transcription of a particular gene in eukaryotic cells? An RNA polymerase associates with transcription factors bound to the gene's regulatory sequences. In a plant, undifferentiated cells that can divide throughout the life of the plant to enable growth are found in which of the following? Meristem Investigators have immunized a rabbit with Substance P. They are studying the effect of the immunization on production of anti-Substance P antibodies over a two-week period following the immunization. Which of the following is the best hypothesis for the experiment? Antibody production by the rabbit in response to Substance P will increase over a two-week period. Experiments were conducted to test the rate of transpiration in plants under different environmental conditions. The stem of a plant was cut. Tubing, attached at one end to a water- filled pipet, was placed over the cut end of the shoot. The tubing and pipet were clamped as shown in the diagram above. Measurements of the water level in the pipet were recorded every 15 minutes. The experimental setup was placed in a room with partial sunlight at 25oC. Which of the following conditions would cause the most rapid lowering of the water level in the pipet? Increasing the light intensity Aphids are small insects that rest on the stems and leaves of plants and insert their needlelike mouthpiece directly into the phloem of the plants. Which of the following is the primary reason that an aphid infestation will kill a plant?