1 While there are wonderful female chefs such as Nigella Lawson and Martha Stewart, I disapprove of the stereotype that women do all of the cooking and cleaning and looking after the children. 2  Everyone looks at me and wonders why I hate make-up and dresses. 3  I dislike shopping and cooking and cleaning.
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Enzyme. Photo by: fotohunter. An enzyme is a biological catalyst. A catalyst is a chemical compound that speeds up the rate of some chemical reaction. When that chemical reaction occurs in a living organism, the catalyst is known as an enzyme.hemical reaction: Any change in which at least one new substance is formed. Lock-and-key model: One of the ways in which enzymes bring about chemical reactions. Product: A compound that is formed as the result of a chemical reaction.