... selected for use in that application. The two yeast here compared, have two such different applications. The first yeast from the Saccharomyces cerevisiae variety is of the Hansen strain and is used in the baking industry, whereas the second also of the Saccharomyces cerevisiae family is the Narbonne strain, utilised in the brewing of wine. Prediction The optimum ability of a variety of yeast to use a carbon source for respiration will depend upon the presence of certain enzymes within the yeast cells. An enzyme is a biological catalyst, which speeds up metabolic reactions, and in the case of yeast is required in order to hydrolyse a particular carbon source. Enzymes are globular proteins, which possess complex tertiary structures. The 'lock and key' mechanism is a theory, which explains enzyme-substrate complex formation. The globular nature of an enzyme's structure gives rise to an area on the enzyme known as an active site. Due to ...

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