Variables in Scientific Experiments
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Questions and Answers

What is a variable in an experiment?

  • An aspect of the experimental conditions that can change (correct)
  • A tool used to measure the outcome
  • A factor that remains constant
  • The outcome of the experiment

    • What did Hershey and Chase observe about the tagged DNA and protein after the experiment?

  • The tagged DNA was not being passed on to the cells while the tagged protein was
  • The tagged DNA was being passed on to the cells while the tagged protein was not (correct)
  • Neither the tagged DNA nor protein was being passed on to the cells
  • Both the tagged DNA and protein were being passed on to the cells

    • What is the purpose of controlling variables in an experiment?

  • To ensure that only the desired variables change (correct)
  • To ensure that all variables change simultaneously
  • To eliminate the need for a hypothesis
  • To guarantee a specific outcome

    • What is the significance of Hershey and Chase's experiment?

    <p>It was one piece that helped solve the puzzle of how cells pass on genetic information</p> Signup and view all the answers

    What should be done after an experiment is completed?

    <p>Gather the data and interpret the results in the context of the hypothesis</p> Signup and view all the answers

    Study Notes

    Variables in Experiments

    • A variable is an aspect of experimental conditions that can change.
    • In Hershey and Chase's experiment, the molecule that was tagged was a variable.
    • The location of the tagged molecule was also a variable.

    Experimental Design

    • Ideally, experiments are designed so that only controlled or observed aspects change.
    • However, it's not always possible to control all variables.

    Hershey and Chase's Experiment

    • The experiment involved tagging molecules to observe how they changed.
    • The results showed that tagged DNA was passed on to cells, but tagged protein was not.

    Interpretation of Results

    • The results supported the hypothesis that DNA provides genetic material.
    • Hershey and Chase's experiment was a key piece in understanding how cells pass on genetic information.

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    Description

    Learn about variables in scientific experiments, including controlled and observed variables, with examples from Hershey and Chase's experiment.

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