Answer the following question given this paragraph: Early researchers in radioactivity found that the emissions from radioactivity could be classified into three distinct types according to their penetrating power. One type of radiation could barely penetrate a sheet of paper. The second type could pass through as much as 3 mm of aluminum. The third type was extremely penetrating and could pass through several centimeters of lead. They named these three types of radiation alpha , beta , and gamma respectively. Eventually, each type of radiation was further identified. Alpha particles are the nuclei of helium atoms, . Beta particles are electrons, and gamma rays are very high energy photons (even higher energy than x-rays). Q: Alpha, beta and gamma are three types of what? Choices: - directions - mutation - convection - radiation A:
radiation
(Question)
Answer the following question given this paragraph: an identical particle that has been ejected from a heavier nucleus. There are six fundamentally different kinds of nuclear decay reactions, and each releases a different kind of particle or energy. The essential features of each reaction are shown in Figure 20.4 "Common Modes of Nuclear Decay". The most common are alphaand beta decay and gamma emission, but the others are essential to an understanding of nuclear decay reactions. Figure 20.4 Common Modes of Nuclear Decay. Q: There are six fundamentally different kinds of nuclear decay reactions, and each releases a different kind of particle or what? Choices: - protein - mineral - mass - energy A:
(Answer)
energy
Ques: Answer the following question given this paragraph: The physical behavior of gases is explained by the kinetic theory of gases. Q: What theory explains the physical behavior of gases? Choices: - thermodynamic theory of gases - relativity theory of gases - quantum theory of gases - kinetic theory of gases A:
Ans: kinetic theory of gases
(Q).
Answer the following question given this paragraph: Mutations in regulatory genes that normally control the cell cycle cause cancer. Q: Mutations in regulatory genes that normally control the cell cycle cause what? Choices: - tumors - anxiety - illness - cancer A:
(A).
cancer
Ques:Answer the following question given this paragraph: Another barrier is the saliva in the mouth, which is rich in lysozymean enzyme that destroys bacteria by digesting their cell walls. The acidic environment of the stomach, which is fatal to many pathogens, is also a barrier. Additionally, the mucus layer of the gastrointestinal tract, respiratory tract, reproductive tract, eyes, ears, and nose traps both microbes and debris, and facilitates their removal. In the case of the upper respiratory tract, ciliated epithelial cells move potentially contaminated mucus upwards to the mouth, where it is then swallowed into the digestive tract, ending up in the harsh acidic environment of the stomach. Considering how often you breathe compared to how often you eat or perform other activities that expose you to pathogens, it is not surprising that multiple barrier mechanisms have evolved to work in concert to protect this vital area. Q: How does lysozyme destroy bacteria? Choices: - by antibiotic use - by eating them - by paralyzing them - by digesting their cell walls A:

Ans:by digesting their cell walls
Answer the following question given this paragraph: Scientific theories are broad explanations that are widely accepted as true. This is because they are supported by a great deal of evidence. Q: What are broad explanations that are widely accepted as true? Choices: - scientific experiments - informal theories - scientific hypotheses - scientific theories A:
scientific theories