Le Hwbiodiversity1

8 Questions | Total Attempts: 227

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Le Hwbiodiversity1

These questions deal with the biodiversity lab. The multiple choice questions will be scored, but the short response questions will not be graded. I must check each question individually and check off the homework log. If you have any questions, please see me. REMEMBER: PERIOD# followed by FIRST & LAST NAME


Questions and Answers
  • 1. 
    Base your answers to this question on the information below and on your knowledge of biology. Paper chromatography can be used to investigate evolutionary relationships. Leaves from a plant were ground and mixed with a solvent. The mixture of ground leaves and solvent was then filtered. Using a toothpick, twenty drops of the filtrate (material that passed through the filter) were placed at one spot on a strip of chromatography paper. This procedure was repeated using leaves from three other species of plants. A separate strip of chromatography paper was prepared for each plant species. Each of the four strips of chromatography paper was placed in a different beaker containing the same solvent for the same amount of time. One of the laboratory setups is shown below. State one reason for using a new toothpick for the filtrate from each plant. [1]
  • 2. 
    Base your answers to this question on the information below and on your knowledge of biology. Paper chromatography can be used to investigate evolutionary relationships. Leaves from a plant were ground and mixed with a solvent. The mixture of ground leaves and solvent was then filtered. Using a toothpick, twenty drops of the filtrate (material that passed through the filter) were placed at one spot on a strip of chromatography paper. This procedure was repeated using leaves from three other species of plants. A separate strip of chromatography paper was prepared for each plant species. Each of the four strips of chromatography paper was placed in a different beaker containing the same solvent for the same amount of time. One of the laboratory setups is shown below. State one way the four strips would most likely be different from each other after being removed from the beakers. [1]
  • 3. 
    Base your answers to this question on the information below and on your knowledge of biology. Paper chromatography can be used to investigate evolutionary relationships. Leaves from a plant were ground and mixed with a solvent. The mixture of ground leaves and solvent was then filtered. Using a toothpick, twenty drops of the filtrate (material that passed through the filter) were placed at one spot on a strip of chromatography paper. This procedure was repeated using leaves from three other species of plants. A separate strip of chromatography paper was prepared for each plant species. Each of the four strips of chromatography paper was placed in a different beaker containing the same solvent for the same amount of time. One of the laboratory setups is shown below. State how a comparison of these resulting strips could indicate evolutionary relationships. [1]
  • 4. 
    A chromatography setup is shown below. Identify one error in the setup. [1]
  • 5. 
    The technique of paper chromatography was performed on plant extracts from four different plant species. The results showed the same pattern for two of the plant species. State an evolutionary relationship between these two plants that is supported by this observation. [1]
  • 6. 
    Paper chromatography is a laboratory technique that is used to
    • A. 

      Separate different molecules from one another

    • B. 

      Stain cell organelles

    • C. 

      Indicate the pH of a substance

    • D. 

      Compare relative cell sizes

  • 7. 
    A technique used to analyze pigments in spinach leaves is shown in the diagram below. This technique is known as
    • A. 

      Paper chromatography

    • B. 

      Gene manipulation

    • C. 

      Dissection

    • D. 

      Staining

  • 8. 
    Base your answer to this question on the results of an experiment using plant pigments represented below and on your knowledge of biology. Which phrase could be used to describe this technique?
    • A. 

      The use of chromatography to separate molecules in a mixture

    • B. 

      The use of cut leaves to observe certain colors

    • C. 

      Using indicators to determine pH

    • D. 

      Using dichotomous keys to identify plants