Regents Living Environment Test Preparation Practice

    Applications Of Biotechnology


    Base your answers to questions 12 on the information below and on your knowledge of biology.

    Transgenic Salmon

    Transgenic Atlantic salmon have been produced using DNA from other species of related fish. These genetically modified fish have an altered DNA “switch” that causes them to overproduce growth hormone. The transgenic Atlantic salmon grow to normal size, but they reach market size in half the time of conventional Atlantic salmon. As with most of the salmon consumed by people, the transgenic Atlantic salmon would be grown using aquatic farming methods. Scientists have expressed concern that transgenic fish can have undesirable effects on the natural environment. Fish growers would be expected to take steps to ensure that the transgenic salmon do not escape into the wild.


    Base your answers to questions 13 on the information and diagram below and on your knowledge of biology.

    If a Chihuahua with short hair has a hidden gene for long hair, it can produce both long-haired and short-haired puppies when bred to a Chihuahua with long hair.

    genetics and biotechnology, applications of biotechnology fig: lenv82017-examw_g19.png


    Base your answer to question 14 on the information below and on your knowledge of biology.

    For many years, scientists hypothesized the existence of a single tomato gene that increases the sweetness and production of tomatoes. After years of research, a team of scientists identified the gene and observed greater sweetness and tomato production in plants that contain this gene.


    Base your answers to questions 15 on the information below and on your knowledge of biology.

    Green Algae Could Help Clean up Radioactive Nuclear Waste

    Recent studies have shown that the uses of green algae are boundless. First, scientists at R.I.T. used algae to synthesize biofuel, and recently scientists at Northwestern University and Argonne National have found that freshwater algae can remove strontium 90 from radioactive wastewater. These developments can significantly aid the future effort to clean up radioactive waste at the Fukushima Daichi Plant [a nuclear power plant in Japan]. Scientists discovered that the process begins when the green algae first absorb strontium, calcium and barium from water. The strontium and barium form crystals inside each algae cell. The crystals remain inside the cells, but the algae filters out and excretes calcium and other minerals that may be present. The strontium is then isolated, and thus able to be treated.

    Researchers are still figuring the best way to harness the algae’s capabilities. Since algae doesn’t differentiate between radioactive and inactive strontium (they are chemically identical), it is not known how the algae would hold up in a highly radioactive environment. But the good news is that they have been able to manipulate the algae’s process to be more strontium-selective, thus removing as much as possible.…