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anonymous

  • one year ago

When a biologist in a laboratory reports a new discovery based on experimental results, biologists in other laboratories should be able to A. repeat the experiment with a different variable and obtain the same results. B. perform the same experiment and obtain different results. C. repeat the same experiment and obtain the same results. D. perform the same experiment under different experimental conditions and obtain the same results.

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  1. anonymous
    • one year ago
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    Students placed equal amounts of bacteria on fifteen identical agar plates containing the same amounts and types of nutrients. Five of the plates were kept at 0ºC, five were kept at 45ºC, and five were kept at 22ºC (room temperature). Which of the following was probably the hypothesis for this experiment? A. The growth of bacteria increases as temperature increases. B. The type of nutrient causes bacteria to grow faster at higher temperatures. C. The size of the plates determines the temperature of the bacteria. D. The temperature of bacteria is determined by the bacteria's growth.

  2. anonymous
    • one year ago
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    A woman treated her home with a pesticide that kills spiders. The first application killed 78% of the spiders. Two months later she applied the pesticide again, but it only killed 45% of the spiders. What would best explain the decrease in the effectiveness of the pesticide? A. The pesticide only works on mature spiders. B. Once spiders learned how to avoid the pesticide they taught others. C. The surviving spiders were naturally resistant to the pesticide and that resistance was inherited by their offspring. D. Some of the spiders became able to digest the pesticide due to mutation of the digestive tract.

  3. anonymous
    • one year ago
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    The table shows the results of a study testing the effectiveness of a migraine medication. Why was one group given a sugar tablet? A. to include a control group B. to have an experimental group C. to provide a variety of treatments D. to give the body additional nutrients

  4. anonymous
    • one year ago
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    Analisa conducted an experiment to determine if watching different types of commercials would affect a person's pulse. Her hypothesis was that pulse rate would change with different types of commercials. Each person watched seven different commercials, averaging 30 seconds each. Each person's pulse was taken before the commercial and then after each commercial. Based on her experiment Analisa concluded that a person's pulse rate changed when the person watched different types of commercials. Which component is missing from Analisa's experiment? A. a question B. a hypothesis C. a control group D. a description of the experiment

  5. anonymous
    • one year ago
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    Which type of equipment would be used to precisely measure 26.0 mL of dilute hydrochloric acid? A. 100 mL beaker B. 500 mL Erlenmeyer flask C. 50 mL graduated cylinder D. 10 mL test tube

  6. anonymous
    • one year ago
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    Winds, known as trade winds, blow from east to west across the Pacific Ocean. These winds move water at the surface. When this happens deeper, colder water rises to the surface along the California coast. Nutrients that would normally stay at the bottom of the ocean rise to the surface as well. Which of the following conclusions is supported by the information above? A. Trade winds help sustain some food chains. B. Trade winds produce minerals in some oceans. C. Trade winds can reverse parts of the water cycle. D. Trade winds may be able to reduce global warming.

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