Answer the following question given this paragraph: Nuclear Fission Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleonthat is, mass numbers and binding energies per nucleon that are closer to the "peak" of the binding energy graph near 56 (see Figure 21.3). Sometimes neutrons are also produced. This decomposition is called fission, the breaking of a large nucleus into smaller pieces. The breaking is rather random with the formation of a large number of different products. Fission usually does not occur naturally, but is induced by bombardment with neutrons. The first reported nuclear fission occurred in 1939 when three German scientists, Lise Meitner, Otto Hahn, and Fritz Strassman, bombarded uranium-235 atoms with slow-moving neutrons that split the U-238 nuclei into smaller fragments that consisted of several neutrons and elements near the middle of the periodic table. Since then, fission has been observed in many other isotopes, including most actinide isotopes that have an odd number of neutrons. A typical nuclear fission reaction is shown in Figure 21.14. Q: The first reported nuclear fission occurred in 1939 when three german scientists bombarded uranium-235 atoms with slow-moving what? Choices: - protons - electrons - isotopes - neutrons A:
neutrons
(Question)
Answer the following question given this paragraph: Cellular respiration by living things releases carbon into the atmosphere or ocean as carbon dioxide. Q: Living organisms release carbon dioxide into the atmosphere by what method? Choices: - genomic respiration - widespread respiration - major respiration - cellular respiration A:
(Answer)
cellular respiration
Ques: Answer the following question given this paragraph: Your body's first line of defense is like a castle's moat and walls. It keeps most pathogens out of your body. The first line of defense includes physical, chemical, and biological barriers. Q: What is the purpose of your body's first line of defense? Choices: - reject foreign bodies - fight or flight - heal wounds - to keep out pathogens A:
Ans: to keep out pathogens
(Q).
Answer the following question given this paragraph: Brewers of beer and wine use yeast to add alcohol to beverages. Traditional varieties of yeast not only make but also limit the quantity of alcohol in these beverages, because above 18% by volume, alcohol becomes toxic to the yeast itself. Wine is produced by fermentation of the natural sugars present in grapes and other kinds of fruit. Beer, whiskey, and vodka are produced by fermentation of grain starches that have been converted to sugar by the enzyme amylase, and rum is produced by fermentation of sugarcane. In each of these fermentations, sugars are converted into small amounts of ATP, using and regenerating NAD + in the process, and producing ethanol and carbon dioxide. Scientists have recently developed new strains of yeast which can tolerate up to 25% alcohol by volume. These are used primarily in the production of ethanol fuel. Q: Why do beer brewers add yeast to the wort? Choices: - reduce alcohol - add carbonation - increase longevity - to make alcohol A:
(A).
to make alcohol
Ques:Answer the following question given this paragraph: Q: What types of blood cells are required for aerobic respiration? Choices: - white blood cells - grey blood cells - large blood cells - red blood cells A:

Ans:red blood cells
Answer the following question given this paragraph: Figure 18.15 Both positive and negative objects attract a neutral object by polarizing its molecules. (a) A positive object brought near a neutral insulator polarizes its molecules. There is a slight shift in the distribution of the electrons orbiting the molecule, with unlike charges being brought nearer and like charges moved away. Since the electrostatic force decreases with distance, there is a net attraction. (b) A negative object produces the opposite polarization, but again attracts the neutral object. (c) The same effect occurs for a conductor; since the unlike charges are closer, there is a net attraction. Q: What type of polarization does a negative object create> Choices: - common polarization - simple polarization - negative polarization - opposite polarization A:
opposite polarization