How Does a Temperature Affect the Rate of Yeast Respiration

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The Effect of Temperature on the Respiration of Yeast
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Length: 5831 words (16.7 double-spaced pages)
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - The Effect of Temperature on the Respiration of Yeast

In this piece of coursework I will be researching, studying and experimenting with yeast. I will be aiming to find out how temperature affects the rate of respiration of yeast. I will research thoroughly the effects of temperature on respiration of yeast by using a variety of resources such as books, internet, and scientific programs. I will also research the other factors effecting the respiration of yeast to enable me to carry out a fair and accurate investigation. This will help me gain a solid knowledge of yeast and respiration and will aid me in making an accurate hypothesis which will hopefully be reflected in my experiments.

Aim: I am aiming to carry out a range of experiments to find out how the rate of respiration of yeast is affected by temperature. I will also try and find the optimum temperature for which respiration works best in yeast. I will aim to carry out my experiments safely and I will aim to achieve accurate results which will hopefully support my background research and hypothesis.

Background Information

Yeast is a tiny micro-organism with plant like structures or it can also exist as a form of fungi. It is so minute it can only be viewed under a microscope. Yeast can survive in a number of different environments, as it exists as several different species it can adapt accordingly. It exists in or on all living matter such as soil, water, air etc… As a living organism yeast requires water and sugar, as well as an adequate climate to survive, with albumen or nitrogenous material as necessary additions in order for yeast to thrive. Yeast also grows rapidly, reproducing asexually

Respiration is a process that takes place in all living cells. Yeast can respire aerobically or anaerobically, however for alcohol to be produced yeast must respire anaerobically. Respiration converts sugars taken in by the organism into energy. It is the controlled breakdown of carbohydrates to make energy. The usable form of energy for most living organisms is adenosine triphosphate (ATP), the other products of respiration being carbon dioxide and water. The reaction taking place in aerobic respiration is:

C6H12 O6+ 6O2→ 6CO2+ 6H2O + ATP

This reaction requires oxygen and is the most viable method of respiration. Cellular respiration has three main stages; Glycolysis, the Krebs cycle and electron transport. Glycolysis splits up the sugars involved in respiration. It can take place with or without oxygen and is the first stage of aerobic respiration. It breaks down the carbohydrate into 2 ATP molecules and 2 high energy electron carrying molecules. The next stage is the Krebs cycle. High energy storing compounds nicotinamide adenine dinucleotide (NAD) and flavin adenine dinucleotide (FAD) are reduced and carry electrons to the next stage. Electron transport requires oxygen to take place. It...
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