Wednesday, August 1, 2012

STPM Biology - chapter 3: Revision essay question 5

List out and explain the properties of enzymes.




Answer:


-All enzymes are globular proteins. Enzymes catalyse reactions without being destroyed or chemically changed. The action of enzyme is specific. For example, maltase only catalyse the hydrolysis of maltose. Enzyme is sensitive to temperature. An enzyme could only function in a small range of temperature. At temperatures much higher than optimum. Enzymes are inactive as enzymes are denatured. Enzymes are also sensitive to pH. Each enzyme can function only in a small range of pH. Outside this range of pH, enzymes become less active or inactive. Enzyme molecule is much larger than substrate molecule. The presence of  enzymes does not change the product of the catalysed reaction. The same enzyme catalses reaction in both directions of a reversible raction.

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