Yeast cells and mouse muscle cells are each grown in two flasks of glucose solution. Air is bubbled through one flask of each type of cell. The other flask of each type is sealed so that no oxygen can reach the cells.
After several hours, ethanol is found in only one of the four flasks.
Which flask is it?
yeast cells in the sealed flask
mouse muscle cells with air bubbled through
mouse muscle cells in the sealed flask
yeast cells with air bubbled through
113 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.