Homework activities for OCR A BiologyThe flow diagram below shows how cheese is made. milk at 70AdC cheddar cheese milk cooled to 30 C curd cheese curds sour milk rennet ... is yeast? ii Why is it used to make bread? iii What is the function of the sugar? b Why is the yeast mixed with warm rather than hot water? c ... Yeasts, moulds and bacteria can be used.
|Title||:||Biology Homework for OCR A for Double and Separate Awards|
|Author||:||Jackie Clegg, Elaine Gill|
|Publisher||:||Heinemann - 2001|