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More than just a fancy coat, why were his brothers jealous of him?

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The cells of beetroot contain a red pigment. A student investigated the effect of temperature on the loss of red pigment from beetroot. He put discs cut from beetroot into tubes containing water. He maintained each tube at a different temperature. After 25 minutes, he measured the percentage of light passing through the water in each tube.The student put the same volume of water in each tube.Explain why it was important that he controlled this experimental variable. (2)

A student investigated the effect of chewing on the digestion of starch in cooked wheat. He devised a laboratory model of starch digestion in the human gut. This is the method he used. 1. Volunteers chewed cooked wheat for a set time. The wheat had been cooked in boiling water. 2. This chewed wheat was mixed with water, hydrochloric acid and a proteindigesting enzyme and left at 37 oC for 30 minutes. 3. A buffer was then added to bring the pH to 6.0 and pancreatic amylase was added. This mixture was then left at 37 oC for 120 minutes. 4. Samples of the mixture were removed at 0, 10, 20, 40, 60 and 120 minutes, and the concentration of reducing sugar in each sample was measured. 5. Control experiments were carried out using cooked wheat that had been chopped up in a blender, not chewed. What reducing sugar, or sugars, would you expect to be produced during chewing? Give a reason for your answer.

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