A student decides to investigate the effect of temperature on the rate of starch digestion by the enzyme amylase. The following equipment is available: iodine solution, 10% starch solution, 5% amylase solution, stopwatch, pipettes, spotting tiles, test tubes, water baths set at the temperatures 200C, 400C, 600C and 800C. Access to a tap is also possible.

Using the equipment available, outline a method for this investigation

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the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.