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Liver and Enzymes

Time Frame:
1 class period that runs 60 minutes.

Group Size:
Small Groups


 

Summary:
Students use enzymes in liver to breakdown hydrogen peroxide. The reaction is measured by the temperature changes.

Main Curriculum Tie:
Science - Biology
Standard 2 Objective 1

Describe the fundamental chemistry of living cells.

Materials:

  • student sheet (attached)
  • Intel temperature probe
  • CBL and calculator (or thermometer and clock with second hand)
  • graduated cylinder
  • hydrogen peroxide (3%)
  • a selection of other chemicals such as hydrochloric acid
  • ammonia
  • salt solution
  • baking soda solution etc
  • 1 cm chunks of raw beef liver
  • 2 test tubes
  • test tube rack
  • tweezers

Attachments

Background For Teachers:
Cells build up hydrogen peroxide during cellular reactions and it is harmful to the cells. The liver has an enzyme called catalase that breaks down hydrogen peroxide to carbon dioxide and water so it can be released from the cells. The heat released goes up rapidly, levels off, and then drops so it is easy for the students to calculate the changes.

Instructional Procedures:

  1. Help students program Intel CBL’s and calculators to collect data every 30 seconds for 1 readings.
  2. Show students where materials are and go over procedures.
  3. Allow students time to collect data and complete graphs.
  4. Compare student data on the board. Students can write their groups highest reading.
  5. Allow students time to clean up and answer analysis questions.

Assessment Plan:
Scoring guide:

1. Student participates and contributes to group work………………4
2. Student records data and accurately graphs it…………………….4
3. Student correctly answers questions……………………………….4
4. Conclusion specifically identifies learning………………………….4

Bibliography:
Lesson Design by Jordan School District Teachers and Staff.

Author:
Utah LessonPlans

Created Date :
Nov 14 2014 10:59 AM

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