Biology IA Proposal PDF

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Proposal for an experiment for the final biology internal assessment...

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Caroline van Meerbeeck Biology SL Mark Harris

Biology Internal Assessment Proposal Research Question: What types of sugar is yeast able to metabolize? Hypothesis: Yeast will metabolize maltose and sucrose at the fastest rate due to the nature of yeast and what it is made up of. It will metabolize lactose at a slower rate because yeast can not break down lactose without the aid of a lactase enzyme present. Independent Variables: - Sucrose - Lactose - Maltose - Glucose - Fructose Dependent Variable: - Rate of metabolism in yeast Control Variables: - Time - Temperature - Volume of yeast - Volume of sucrose/lactose/maltose/glucose/fructose Equipment List: - Beakers (6) - Pressure Sensor (1) CO2 sensor (1) - Sucrose - Lactose - Maltose - Baker’s yeast - Laptop (1) - Pasco Capstone - Timer (1) - Temperature controlling water bath - Thermometer (1) Method: 1) Measure out 5 grams of yeast and put it into a beaker with 10 ml of water 2) Add 5 grams of sucrose and mix until the solution is combined 3) Add the beaker to a water bath at a temperature of 40°C and let it sit for 2 minutes until the temperature of the solution is 40°C 4) Place the pressure sensor or CO2 on the beaker

Caroline van Meerbeeck Biology SL Mark Harris

5) 6) 7) 8)

Start the pasco capstone measuring system and let it run for 2 minutes Click stop after 2 minutes have passed and record the data into the data table Repeat steps 1-4 for lactose and maltose Analyse the data and create graphs that compare the different rates of reaction

Data Table: Type of Sugar Sucrose Lactose Maltose Sketch of Graph:

Trial 1

Trial 2

Average...