Q: Cellular respiration and photosynthesis are important parts of which cycle? Read this paragraph and choose the correct option from the provided answers: Cellular respiration and photosynthesis are important parts of the carbon cycle. The carbon cycle is the pathways through which carbon is recycled in the biosphere. While cellular respiration releases carbon dioxide into the environment, photosynthesis pulls carbon dioxide out of the atmosphere. The exchange of carbon dioxide and oxygen during photosynthesis ( Figure below ) and cellular respiration worldwide helps to keep atmospheric oxygen and carbon dioxide at stable levels. Choices: - vapor cycle - greenhouse effect - water cycle - carbon cycle A:
carbon cycle

Q: What type of disease can be treated by radioactive elements in glucose? Read this paragraph and choose the correct option from the provided answers: Despite its dangers, radioactivity has several uses. It can be used to determine the ages of ancient rocks and fossils. This use of radioactivity is explained in this chapter's "Radioactive Decay" lesson. Radioactivity can also be used as a source of power to generate electricity. This use of radioactivity is covered later on in this chapter in the lesson "Nuclear Energy. " Radioactivity can even be used to diagnose and treat diseases, including cancer. Cancer cells grow rapidly and take up a lot of glucose for energy. Glucose containing radioactive elements can be given to patients. Cancer cells will take up more of the glucose than normal cells do and give off radiation. The radiation can be detected with special machines (see Figure below ). Radioactive elements taken up by cancer cells may also be used to kill the cells and treat the disease. You can learn more about medical uses of radiation at the URL below. Choices: - mutation - infection - genetic disorder - cancer A:
cancer

Q: Q: Why will water balloons launched into the air eventually burst? Read this paragraph and choose the correct option from the provided answers: Each day, hundreds of weather balloons are launched. Made of a synthetic rubber and carrying a box of instruments, the helium-filled balloon rises up into the sky. As it gains altitude, the atmospheric pressure becomes less and the balloon expands. At some point the balloon bursts due to the expansion, the instruments drop (aided by a parachute) to be retrieved and studied for information about the weather. Choices: - heat - momentum - friction - expansion A:
A: expansion

Question: Q: Alkanes are nonpolar and therefore do not attract what? Read this paragraph and choose the correct option from the provided answers: Alkanes are nonpolar; they do not attract ions. Choices: - molecules - eons - atoms - ions A:
Answer: ions

*Question*
Q: Catalytic converters used on motor vehicles break down pollutants in what, yielding non-toxic compounds? Read this paragraph and choose the correct option from the provided answers: Catalytic converters are used on motor vehicles. They break down pollutants in exhaust to non-toxic compounds. For example, they change nitrogen oxides to harmless nitrogen and oxygen gases. Choices: - muffler - intake - oil - exhaust A:
**Answer**
exhaust

Q: The formation of an amalgam allows the metal to react with what? Read this paragraph and choose the correct option from the provided answers: The metals of group 13 (Al, Ga, In, and Tl) are all reactive. However, passivation occurs as a tough, hard, thin film of the metal oxide forms upon exposure to air. Disruption of this film may counter the passivation, allowing the metal to react. One way to disrupt the film is to expose the passivated metal to mercury. Some of the metal dissolves in the mercury to form an amalgam, which sheds the protective oxide layer to expose the metal to further reaction. The formation of an amalgam allows the metal to react with air and water. Choices: - helium and oxygen - cloth and plastic - blood and sweat - air and water A:
air and water