Answer the following question given this paragraph: If a cell were a house, the plasma membrane would be walls with windows and doors. Moving things in and out of the cell is an important role of the plasma membrane. It controls everything that enters and leaves the cell. There are two basic ways that substances can cross the plasma membrane: passive transport and active transport. Q: In how many basic was can substances cross the plasma membrane? Choices: - one - three - four - two A:
two
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Answer the following question given this paragraph: Electric generators convert mechanical energy to electric energy. The generator consists of some number of wire loops wrapped around an iron core and placed in a strong magnetic field. The loops of wire and the iron core are called the armature . The armature is mounted so that it can rotate freely inside the magnetic field. Mechanical energy is used to spin the armature in the field so that the wire loops cut across the field and produce electric current. The of this current is calculated by . Q: Electric generators convert what type of energy to electric energy? Choices: - electromagnetic energy - thermodynamic energy - fluid energy - mechanical energy A:
mechanical energy
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Answer the following question given this paragraph: Energy is the ability to do work. When work is done, energy is transferred from one object to another. Energy can exist in different forms, such as electrical and chemical energy. Most forms of energy can also be classified as kinetic or potential energy. Q: Kinetic and potential are two forms of what? Choices: - pressure - fuel - exercise - energy A:
energy
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Answer the following question given this paragraph: Surface currents are extremely important because they distribute heat around the planet. Surface currents also have a tremendous influence on climate around the globe. Q: Which currents distribute heat around the planet and have a large impact on climate? Choices: - air - electrical - wind - surface A:
surface
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