By Rashiv Lubana

Investigation and analyzing the effects of temperature change on anaerobic cellular respiration of the yeast cells

                                                                                                       

      Rashiv Lubana

                                                                                                                  Biology 20-IB

December 12th 2008

                                                                                                                 Mr. Myskiw

Investigation and analyzing the effects of temperature change on anaerobic cellular respiration of the yeast cells.

Introduction: Yeast () is a Eukaryotic microorganism and is classified into Kingdom Fungi. Yeasts are  which means that they use  as a source of energy and do not necessarily require sunlight and oxygen to grow. Yeast instead takes sugars such as  and  for energy. Yeast needs energy to carry out different functions during their lifetime. They obtain this energy through cellular respiration, which involves the oxidation of organic molecules. Some of the energy produced by oxidation is stored in the chemical bonds of adenosine triphosphate (ATP) - the energy currency of the cell.

There are two types of cellular respirations which are being carried out in the environment. First Aerobic respiration, it is the respiration which can be performed by all the living things in the presence of air. On the other hand anaerobic respiration is performed in the absence of oxygen and only some microorganisms are capable of performing it. The main purpose of cellular respiration is to produce energy which can be used by living organisms to complete different tasks. Yeast is able to perform both types of respiration. 

Join now!

When oxygen level depletes yeast functions anaerobically and then carries out Ethanol Fermentation. Fermentation in brewer’s yeast is used in industries to manufacture baked good and alcoholic beverages. Depending on the substance being fermented the variety of Yeast being used, and carbon dioxide availability produced during the process yeast fermentation may be used to produce different substances like wine, champagne, syrupy drinks and ciders.

Ethanol Fermentation in the yeast cells can occur in the cytoplasm via enzymes under anaerobic conditions using the chemical reaction below:

C12H22O11(s) + H2O → CH3CH2OH(l) +  4  + ATP

Sucrose + Water → Ethanol + Carbon Dioxide ...

This is a preview of the whole essay