Q: Q: What is the generation of electricity using photovoltaic cells to split water molecules called? Read this paragraph and choose the correct option from the provided answers: With fossil fuels becoming more expensive and less available, scientists are looking for other energy sources. Hydrogen has long been considered an ideal source, since it does not pollute when it burns. The problem has been finding ways to generate hydrogen economically. One new approach that is being studied is photoelectrolysis the generation of electricity using photovoltaic cells to split water molecules. This technique is still in the research stage, but appears to be a very promising source of power in the future. Choices: - hybrid electricity - aqua-electricity - photovoltaic cells - photoelectrolysis A:
A: photoelectrolysis

Q: Q: What term means opposition to the flow of electric charges that occurs when electric current travels through matter? Read this paragraph and choose the correct option from the provided answers: Resistance is opposition to the flow of electric charges that occurs when electric current travels through matter. The SI unit of resistance is the ohm (named for the scientist Georg Ohm, whom you can read about below). Resistance is caused by electrons in a current bumping into electrons and ions in the matter through which the current is flowing. Resistance is similar to the friction that resists the movement of one surface as it slides over another. Resistance reduces the amount of current that can travel through the material because some of the electrical energy is converted to other forms of energy. For example, when electric current flows through the tungsten wire inside an incandescent light bulb, the tungsten resists the flow of electric charge, and some of the electrical energy is converted to light and thermal energy. Choices: - polarity - antagonism - diffusion - resistance A:
A: resistance

Q: Q: The ability to regulate what, which is possessed by mammals, was an advantage as earth's climate went through sudden and dramatic changes? Read this paragraph and choose the correct option from the provided answers: Mammals have the ability to regulate body temperature. This is an advantage, as Earth's climate went through sudden and dramatic changes. Mastodons, saber tooth tigers, hoofed mammals, whales, primates and eventually humans all lived during the Cenozoic Era ( Figure below ). Choices: - mutations - reflex behaviors - hair growth - body temperature A:
A: body temperature

Q: Q: When something is described as "hydrophilic", you can determine something about how it interacts with what? Read this paragraph and choose the correct option from the provided answers: hydrophilic heads are directed outward, in contact with the water. Each micelle may contain thousands of lipid molecules. Polar lipids may also form a monolayer, a layer one molecule thick on the surface of the water. The polar heads face into water, and the nonpolar tails stick up into the air. Bilayers are double layers of lipids arranged so that the hydrophobic tails are sandwiched between an inner surface and an outer surface consisting of hydrophilic heads. The hydrophilic heads are in contact with water on either side of the bilayer, whereas the tails, sequestered inside the bilayer, are prevented from having contact with the water. Bilayers like this make up every cell membrane (Figure 17.6 "Schematic Diagram of a Cell Membrane"). Figure 17.5 Spontaneously Formed Polar Lipid Structures in Water: Monolayer, Micelle, and Bilayer. Choices: - hydrogen - air - iron - water A:
A: water