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Sample TAKS Questions Objective 2 – Living Systems Objective 3 – Organisms and Environment A for Cell 1; B for Cell 2 Which molecule provides most of the energy used to drive chemical reactions in cells? F DNA G RNA H ATP J ADP When a sea urchin egg is removed from the ocean and placed in freshwater, the egg swells and bursts. Which of these causes water to enter the egg? F Coagulation G Sodium pump H Active transport J Osmosis Which of these best explains why a freshwater aquarium would be a dangerous habitat for saltwater fish? A The tissues of the saltwater fish would absorb too much acid. B The organs of the saltwater fish would produce too much protein. C The organ systems of the saltwater fish would consume too much energy. D The cells of the saltwater fish would gain too much water. Saltwater fish remove extra salt from their body by active transport through the gills. What is the result of this activity B Water balance is maintained in the blood. C The rate of energy production is decreased. D The cell membrane becomes less permeable to water. All of the following are found in a DNA molecule except — A carbon dioxide B deoxyribose C nitrogen D phosphate In DNA, which of the following determines the traits of an organism? F Amount of adenine G Number of sugars H Sequence of nitrogen bases J Strength of hydrogen bonds • Which molecule is most responsible for determining an organism’s eye color, body structure, and cellular enzyme production? A Complex starch B Fatty acid C Carbohydrate D Deoxyribonucleic acid • In all plant and animal cells, the nucleus contains long molecules of DNA. Which of the following best describes the function of DNA F DNA provides the shape and structure of the nucleus. G DNA packages materials for transport through the nucleus. H DNA carries materials into and out of the nucleus. J DNA contains the blueprint for producing the whole organism.