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cellular respiration

Extracts from this document...

Introduction

Extended Experimental Investigation Respiration Introduction: All living things respire. In fact, respiration is one of the most basic characteristics of living organisms so that if an object does not respire, it's not considered living. Respiration involves a complex series of chemical reactions where sugars are broken down to release energy by the use of oxygen. Respiration is the energy producing process of breathing, by which an organism supplies its cells with oxygen and relieves itself of carbon dioxide. The most effective way for cells to harvest energy stored in food is through cellular respiration, which is a metabolic process that captures the chemical energy from foods and converts them into ATP. The energy required to power living cells comes from the sun; plants capture this energy and convert it to organic molecules. In respiration, plants and animals convert glucose back into energy for growth. The chemical equation shows that the photosynthates from photosynthesis are combined with oxygen. The chemical equation for the process of respiration is: C6H12O6 + 6O2 <====> 6CO2 + 6H2O + energy The process is similar to the oxidation that occurs when wood is burned, producing heat. When compounds combine with oxygen, the process is referred to burning. ...read more.

Middle

test tube was then placed in the stand and clamp and tilted horizontally Step 10: The experiment was then left for 5 minutes for the soda lime to absorb the existing CO2 in the test tube Step 11: After the 5 minutes was up a small amount of red die was sucked up into the pipette by using the syringe Step 12: The red die would then move down the test tube indicating the respiration of the mung beans Step 13: After 5 minute intervals results on how far the red dye had moved were recorded Step 14: Steps 2-13 were repeated until all appropriate experiments were performed (Source: John Miller) Safety: During the experiment, there were very little safety requirements. Before any experiments were undertaken, risks assessments were to be completed and handed in. Normal lab procedures are to be followed such as wearing safety glasses, safety gloves, shoes ect. The main safety precaution was the soda lime (mixture of calcium hydroxide and sodium hydroxide), which is a strong base and will cause irritation and burns upon contact with skin. If you come in contact with soda lime, thoroughly wash with soap for 5 minutes and alert nearby teacher. ...read more.

Conclusion

- 20 mungbeans 5 minutes (cm moves) Test 1 2.3cm Test 2 4.2cm* Test 3 2.22cm Average 2.26 Tuesday 28.04.09 - Day 2 (2 day old germinated) - 20 mungbeans INVALID 5 minutes (cm moves) Test 1 0.35 Average Wednesday 29.04.09 - Day 3 (3 day old germinated) - 20 mungbeans 5 minutes (cm moves) Test 1 2.1cm Test 2 1.8cm Test 3 2.7cm Average 2.2 Thursday 30.04.09 - Day 4 (4 day old germinated) - 20 mungbeans 5 minutes (cm moves) Test 1 2.9cm* Test 2 1.8cm Test 3 1.7cm Test 4 1.7cm Test 5 1.8cm Test 6 1.8cm Test 7 1.6cm Test 8 1.7cm Test 9 1.6cm Average 1.7 Friday 01.05.09 - Day 5 (5 day old germinated) - 20 mungbeans 5 minutes (cm moves) Test 1 1.1cm Test 2 1.2cm Test 3 1.2cm Average 1.2 Tuesday 05.05.09 - Day 6 (non-germinated) - 20 mungbeans INVALID 5 minutes (cm moves) Test 1 1.9cm Test 2 0.7cm Average Wednesday 06.05.9 - Day 7 (non-germinated) - 20 mungbeans 5 minutes (cm moves) Test 1 1.8cm Test 2 1.0cm Test 3 0.3cm* Average 1.4 Wednesday 06.05.9 - Day 7 (2 day old germinated) - 20 mungbeans 5 minutes (cm moves) Test 1 2.6cm * Test 2 1.7cm Test 3 1.3cm Average 1.5 ...read more.

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