To prepare a microscope slide of cheek cells, stain them and examine them using a light microscope.
When carrying out any experiment, it is important to do a risk assessment. Methylene blue stains the DNA inside of your cheek cells. It is a low hazard substance but can stain skin and clothing. The inside of the cheek is delicate so the cotton bud should only be rubbed gently once along the surface to pick up some cells. The cotton bud should later be placed in disinfectant to stop the spread of any contagious diseases.
When scientists use a microscope to look at cells they often produce a scientific drawing of what they see. This is a record of their observations and what they have been studying.
When producing a scientific drawing:
How could this scientific drawing be improved? [3 marks]