Starch-producing action of enzyme extracts:

This experiment is from Heinemann ‘Biology Two” text and work book – Section 4.5 Genes in Action.
You can get good results in this activity using the following procedure.
Use distilled water to make up the solution with the powdered peas.
Use a fluid:solid ratio of 0.5mL of dist. water per seed.
Therefore, you require 15mL of water for the 30 seeds. This was fine for the smooth seeds but the wrinkly ones required an extra 0.5mL per centrifuge tube.
We were able to powder the seeds (using a mortar & pestle) and hold them overnight in an airtight container.
We then added the water and finished the preparation immediately before the lesson.

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