Answer the following question given this paragraph: Because of the wave character of matter, the idea of well-defined orbits gives way to a model in which there is a cloud of probability, consistent with Heisenberg's uncertainty principle. Figure 30.48 shows how this applies to the ground state of hydrogen. If you try to follow the electron in some well-defined orbit using a probe that has a small enough wavelength to get some details, you will instead knock the electron out of its orbit. Each measurement of the electron's position will find it to be in a definite location somewhere near the nucleus. Repeated measurements reveal a cloud of probability like that in the figure, with each speck the location determined by a single measurement. There is not a well-defined, circular-orbit type of distribution. Nature again proves to be different on a small scale than on a macroscopic scale. Q: Because of the wave character of matter, the idea of well-defined orbits gives way to a model in which there is a cloud of what? Choices: - particles - mutation - chaos - probability A:
probability
(Question)
Answer the following question given this paragraph: Q: Action potentials occur whenever a depolarization increases the membrane voltage to a particular value called what? Choices: - velocity - ohms - fraction - threshold A:
(Answer)
threshold
Ques: Answer the following question given this paragraph: A solution forms when a solute dissolves in a solvent. The rate of dissolving is faster with stirring, a higher temperature, or greater surface area. Many solutes are soluble in water because water is polar. Q: What forms when a solute dissolves in a solvent? Choices: - chemical - gas - liquid - solution A:
Ans: solution
(Q).
Answer the following question given this paragraph: Most prokaryotes have a peptidoglycan cell wall and many have a polysaccharide capsule (Figure 4.5). The cell wall acts as an extra layer of protection, helps the cell maintain its shape, and prevents dehydration. The capsule enables the cell to attach to surfaces in its environment. Some prokaryotes have flagella, pili, or fimbriae. Flagella are used for locomotion. Pili are used to exchange genetic material during a type of reproduction called conjugation. Fimbriae are used by bacteria to attach to a host cell. Q: The cell wall acts as an extra layer of protection, helps the cell maintain its shape, and prevents what? Choices: - extinction - exhaustion - Respiration - dehydration A:
(A).
dehydration
Ques:Answer the following question given this paragraph: For the first 4 billion years of Earth history there is only a little evidence of life. Organisms were tiny and soft and did not fossilize well. But scientists use a variety of ways to figure out what this early life was like. Note that the period from Earth's origin to the beginning of the Phanerozoic is called the Precambrian. Q: What is the period from earth's origin to the beginning of the phanerozoic eon? Choices: - Paleolithic - Cenozoic - anatolian - precambrian A:

Ans:precambrian
Answer the following question given this paragraph: 3.3 The Nucleus and DNA Replication The nucleus is the command center of the cell, containing the genetic instructions for all of the materials a cell will make (and thus all of its functions it can perform). The nucleus is encased within a membrane of two interconnected lipid bilayers, side-by-side. This nuclear envelope is studded with protein-lined pores that allow materials to be trafficked into and out of. Q: What is the name of the command center of the cell? Choices: - mitochondria - molecules - vacuole - nucleus A:
nucleus