Science news.DIRECTIONS: Read the Science News section on pages 4 to 7. Then, test your knowledge by filling in the letters of the correct answers below. 1. How does the Aplysia californica store predator-harming toxins in its body without harming itself? (A) It stores the toxins in a leak-proof organ, so they don't harm the other organs. (B) It holds different toxin-making molecules in separate body compartments. When the molecules are not mixed together, they are harmless. (C) It is immune to its own toxins. (D) The toxins are not poisonous until they react with air. 2. Enzymes (A) start a chemical reaction. (B) convert potential energy into kinetic energy kinetic energy: see energy. kinetic energy Form of energy that an object has by reason of its motion. The kind of motion may be translation (motion along a path from one place to another), rotation about an axis, vibration, or any combination of . (C) are toxins stored in the body. (D) convert kinetic energy into potential energy. 3. The percent daily value compares the amount of each nutrient nutrient /nu·tri·ent/ (noo´tre-int) 1. nourishing; providing nutrition. 2. a food or other substance that provides energy or building material for the survival and growth of a living organism. in a food with the recommended amount a person should consume based on (A) a 2,000-calorie-a-day diet. (B) the food guide pyramid Food Guide Pyramid n. A food pyramid devised by the US Department of Agriculture in 1992, in which grains and cereals represent the base beneath layers for fruits and vegetables, meats and dairy products, and fats and sweets at the peak. . (C) his or her height and weight. (D) his or her age. 4. Which of the following is not a nutrient? (A) cholesterol (B) calorie (C) sodium (D) fat 5. Zubbles' inventor spent 11 years searching for a dye that would bond with the (A) water content in a bubble solution. (B) molecules that make up a bubble. (C) air molecules inside a bubble. (D) air molecules surrounding a bubble. 6. Zubbles' brightly colored solution turns clear when you rub it or add water to it. That's because the action causes the (A) atoms in the dye molecule to sublime sublime /sub·lime/ (sub-lim´) to volatilize a solid body by heat and then to collect it in a purified form as a solid or powder. into vapors. (B) dye to separate and pool on your hand. (C) dye to evaporate e·vap·o·rate v. 1. To convert or change into a vapor; volatilize. 2. To produce vapor. 3. To draw or pass off in the form of vapor. 4. . (D) atoms in each dye molecule to rearrange re·ar·range tr.v. re·ar·ranged, re·ar·rang·ing, re·ar·rang·es To change the arrangement of. re themselves. 7. Scientists believe that a new ocean may be starting to form in a(n) -- desert. (A) Australian (B) South American (C) Asian (D) African 8. A rift is a (A) rock plate that moves vertically. (B) boundary along which two slowly moving rock plates separate. (C) rock plate that is located in a desert. (D) crack on Earth that's located adjacent to an ocean. 9. Arthritis is a disease that causes (A) joints to stiffen stiff·en tr. & intr.v. stiff·ened, stiff·en·ing, stiff·ens To make or become stiff or stiffer. stiff , irritating surrounding muscles. (B) muscles to swell, irritating the surrounding bones. (C) joints to become loose. (D) muscles to stiffen, affecting the joints' ability to move. 10. Some scientists think acupuncture acupuncture (ăk`y  pŭng'chər), technique of traditional Chinese medicine, in which a number of very fine metal needles are inserted into the skin at specially designated points. helps heal a body by (A) using gold pellets to stop a damaged organ from bleeding. (B) using needles to hold severed sev·er v. sev·ered, sev·er·ing, sev·ers v.tr. 1. To set or keep apart; divide or separate. 2. To cut off (a part) from a whole. 3. nerves together. (C) causing the body to produce chemicals that reduce swelling and pain. (D) surgically removing an ailing organ from the body. 1. b 2. a 3. a 4. b 5. b 6. d 7. d 8. b 9. a 10. c |
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