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How will temperature affect the rate at which rennin acts on milk? Introduction. The Kinetic Theory states that with increased temperature, molecules receive more energy, resulting in them speeding up their movement. If the milk and the rennin molecules are moving faster, they will collide more often. The collisions will also have more energy so more of them are successful. Therefore the rate of reaction increases. Preliminary Work. Enzymes are large globular molecules of which the vast majority is protein in nature. Enzymes have catalytic properties; in other words, they alter the rate of reaction without themselves undergoing a permanent change. Most chemical reactions require an initial input of energy, called activation energy, to enable them to occur. Enzymes act as catalysts, reducing the need for activation energy and so allows reactions to take place more readily and at lower temperatures than would otherwise be necessary. This can be seen in the graphs....

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