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Yeast Coursework

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  • Essay length: 2251 words
  • Submitted: 14/11/2008
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AS and A Level Energy, Respiration & the Environment

The first 200 words of this essay...

Biology Coursework: Respiration in Yeast

Planning

Aim

The goal of this experiment is to discover how varying the temperature, of a solution of yeast and sucrose, will affect the amount of carbon dioxide produced during a set time period. After I have completed this experiment and obtained enough data, I will analyse and discuss it, and then I will evaluate it. For this experiment, my independent variable will be the temperature, which I will change by adding warm water to it. My dependent variable will be the amount of carbon dioxide given off. My controlled variable will be the amount of sucrose and yeast there is in the solution, and also the time the experiment will be running for, as these are the only factors that can be varied to produce different amounts of CO2.

Background Knowledge

This experiment involves enzymes, which are biological catalysts. All the chemical reactions in a living organism are collectively known as the metabolism. Anabolic reactions normally need an input of energy, to build up large molecules from smaller ones. Catabolic reactions often release energy when breaking down large molecules into smaller ones. An example of anabolism is the

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