A student is going to grow bacteria from a sample of milk on an agar plate.
Name the substance in the Petri dish that supplies the bacteria with nutrients.
Give one nutrient that the culture medium must supply and state what the bacteria use it for.
The student sterilises the Petri dish and the agar before use. Explain why.
The student passes an inoculating loop through a Bunsen flame until it glows red. Give the reason for this.
139 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.