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Lactase is an enzyme that breaks down lactose into glucose and galactose - Edexcel - GCSE Biology Combined Science - Question 4 - 2019 - Paper 1
Question 4
Lactase is an enzyme that breaks down lactose into glucose and galactose. A student made some alginate beads containing lactase. The student added 10 beads to 20 c... show full transcript
Worked Solution & Example Answer:Lactase is an enzyme that breaks down lactose into glucose and galactose - Edexcel - GCSE Biology Combined Science - Question 4 - 2019 - Paper 1
Step 1
What is the rate of reaction for 25 beads?
Answer
To calculate the rate of reaction, we use the formula:
ext{Rate of reaction} = rac{ ext{Change in product}}{ ext{Time taken}}From the data, for 25 beads, glucose was produced in 120 seconds. Hence:
ext{Rate} = rac{1 ext{ mol of glucose}}{120 ext{ s}} = rac{1}{120} ext{ mol/s} ext{ for 25 beads}To find the rate per bead, we divide by the number of beads:
ext{Rate per bead} = rac{1/120}{25} = rac{1}{3000} = 0.000333 ext{ mol/s}
Now converting to a standardized form:
Choose the closest option provided in the question based on this calculation.