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历年ACT真题科学部分词汇汇总大全 (下)

发布日期:12-22 16:56 分类:ACT科学 阅读次数:50

摘要ellipse— A geometric shape that is formed when a plane Is Intersected with a cone. In this case ...

ellipseA geometric shape that is formed when a plane Is Intersected with a cone. In this case the plane intersects the cone at an angle so that a shape similar to a circle but stretched in one direction is formed. The orbits of the planets around the Sun represent ellipses.

endoplasmic reticulumAn organelle that is used to transport proteins throughout the cell.

energyThe ability to do work or undergo change. Kinetic energy is the energy of motion, while potential energy is stored energy.

enzyme  any one of the complex proteins that are produced by cells and ACT as catalysts in specific biochemical reactions

epicycleSmaller circles on which the planets traveled around the Earth in the geocentric model of the solar system. Epicycles were used to explain the retrograde motion of planets and help make the predicted positions of the planets match the observed positions.

equilibriumA state at which the forward and reverse reaction proceed at the same rate.

focal lengthThe distance from a focal point to a mirror or lens.

forceThat which acts on an object to change its motion; a push or pull exerted on one object by another. Common units are Newtons (N).

freefallAn object in one-dimensional motion that is only acted on by the force of the Earth's gravity. In this case its acceleration will be -g or g downward. 

frequencyThe number of cycles or repetitions per second. Frequency is also often measured as the number of revolutions per second. The common units of frequency are Hertz (Hz) where one Hertz equals 1/second.

frictional forceThe force that acts parallel to surfaces in contact opposite the direction of motion or tendency of motion.

functional groupA group of atoms that give a molecule a certain characteristic or property.

gel electrophoresisA process used in laboratories to determine the genetic makeup of DNA strands. This process involves the movement of chromosomes through a gel from one pole to the other. Magnetism is used to pull the chromosomes through the gel.

geology The study of rocks and minerals. 

glacier A large mass of snow-covered ice.

golgi apparatusAn organelle that packages proteins so that they can be sent out of the cell.

gravitational forceThe attractive force that exists between all particles with mass. 

heliocentric modelThe model of the solar system that places the Sun at the center with the planets orbiting around it.

heterogeneousA mixture that is not uniform in composition. 

homogeneousA mixture in which the components are uniformly distributed.


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