Two different strains of yeast, X X\,X and YYY, are used to ferment glucose solutions to produce bioethanol. Design an investigation to determine which strain of yeast is best for producing bioethanol most rapidly. Your answer should include experimental details and be written in full sentences.
74 exam-style questions on Edexcel IGCSE Biology Food production. Each one has a worked solution and a mark scheme showing where the marks go.