Answer the following question given this paragraph: Water molecules move about continuously due to their kinetic energy. When a crystal of sodium chloride is placed into water, the water's molecules collide with the crystal lattice. Recall that the crystal lattice is composed of alternating positive and negative ions. Water is attracted to the sodium chloride crystal because water is polar and has both a positive and a negative end. The positively charged sodium ions in the crystal attract the oxygen end of the water molecules because they are partially negative. The negatively charged chloride ions in the crystal attract the hydrogen end of the water molecules because they are partially positive. The action of the polar water molecules takes the crystal lattice apart (see image below). Q: Water molecules move about continuously due to what type of energy? Choices: - seismic - potential - optical - kinetic A:
kinetic
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Answer the following question given this paragraph: One idea is that evolution happens. Evolution is a change in the inherited traits of organisms over time. Living things have changed as descendants diverged from common ancestors in the past. Q: What is defined as a change in the inherited traits of organisms over time? Choices: - variation - divergence - generation - evolution A:
evolution
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Answer the following question given this paragraph: A mutation may have no effect. However, sometimes a mutation can cause a protein to be made incorrectly. A defect in the protein can affect how well the protein works, or whether it works at all. Usually the loss of a protein function is detrimental to the organism. Q: What phenomenon can cause a protein in an organism to be made incorrectly? Choices: - evolution - heredity - allele - mutation A:
mutation
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Answer the following question given this paragraph: In measuring quantities we always aim for high accuracy . Estimates that fall within the range of uncertainty for a given instrument are said to be accurate. In our previous example, all of the values between and including 52.4 mL and 53.4 mL would be considered accurate. Estimates that fall outside this range are inaccurate. Accuracy describes how close an estimate is to a known standard. Q: What describes how close an estimate is to a known standard? Choices: - hypothesis - frequency - diversity - accuracy A:
accuracy
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