Chemistry Of Life Quiz 4

11 Questions | Total Attempts: 376

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The Chemistry Of Life Quizzes & Trivia

This quiz will help you assess your understanding of the concepts and vocabulary in the MCPS biology unit: chemistry of life.


Questions and Answers
  • 1. 
    A drop of iodine is placed in a test tube containing a sample of an unknown solution.  The solution turns blue-black.  This indicates that the unknown contains _________.
    • A. 

      Glucose

    • B. 

      Lipid

    • C. 

      Starch

    • D. 

      Protein

  • 2. 
    Several drops of iodine is placed in a test tube containing pure water.  We would expect that the color of the water would become __________.
    • A. 

      Blue-black

    • B. 

      Yellow-brown

    • C. 

      Green

  • 3. 
    Mr. Kissal has a bottle containing a clear, colorless, odorless liquid.  He says he thinks it is pure water.  You remove a small sample, place it into a test tube, and add several drops of iodine.  The color of the liquid in the test tube becomes blue black.  What will you tell Mr. Kissal?
    • A. 

      The water is not pure. It definitely has some starch in it.

    • B. 

      Water is a starch.

    • C. 

      The water is pure and contains no contaminants of any kind.

  • 4. 
    Mr. Kissal has a bottle containing a clear, colorless, odorless liquid.  He says he thinks it is pure water.  You remove a small sample, place it into a test tube, and add several drops of iodine.  The color of the liquid in the test tube becomes brown-yellow.  What will you tell Mr. Kissal?
    • A. 

      The water is not pure. It definitely has some starch in it.

    • B. 

      The water is pure with no contaminants of any kind.

    • C. 

      The water does not contain starch, but it may contain other contaminants that have not been tested for.

  • 5. 
    Ms. Puckett placed a thin slice of potato on a microscope slide.  She adds one drop of iodine.  Under the microscope, Ms. P. should expect to see _______________.
    • A. 

      Cells that are mostly white in color because potatoes are mostly white.

    • B. 

      Cells that are very yellow in color because the iodine stained them and iodine is yellow-brown in color.

    • C. 

      Cells that have large areas of blue-black color because a potato contains the carbohydrate polymer known as starch.

  • 6. 
    A piece of potato is rubbed on a small sheet of brown paper.  What would you expect to see?
    • A. 

      A stained area that allows light to shine through the paper.

    • B. 

      A stained area that does NOT allow light to pass through the paper.

    • C. 

      No change at all on the paper.

  • 7. 
    Which of the following is NOT considered to be a carbohydrate?
    • A. 

      Table sugar

    • B. 

      Cellulose

    • C. 

      Butter

    • D. 

      Fructose

  • 8. 
    Water is used as a control in experiments to test for the presence of various organic compounds.  The reason for this is that ________________.
    • A. 

      Water is inexpensive and therefore it is easy to use

    • B. 

      Water is an excellent solvent and soak up all of the chemicals that are used.

    • C. 

      Water is NOT an organic molecule and therefore it is good to use for comparison.

  • 9. 
    When you are performing tests for organic compounds, you should use _____________ for eye protection.
    • A. 

      Your hands shielding your eyes

    • B. 

      Glasses if you wear them

    • C. 

      Goggles

    • D. 

      No special equipment

  • 10. 
    DNA and RNA are examples of __________.
    • A. 

      Polysaccharides

    • B. 

      Amino acids

    • C. 

      Proteins

    • D. 

      Nucleic acids

  • 11. 
    A drop of vegetable oil is placed on a small piece of brown paper.  You would expect to see which of the following?
    • A. 

      A small drop that does not soak into the paper because oil molecules are very cohesive with high surface tension.

    • B. 

      A wet spot that does not allow light to pass through.

    • C. 

      A spot that is translucent, i.e. it allows light to shine through it.

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