Q: What is a gram stain used to identify ?


Read this paragraph and choose the correct option from the provided answers:

Different types of bacteria stain a different color when Gram stain is applied to them. This makes them easy to identify. Some stain purple and some stain red, as you can see in Figure below . The two types differ in their outer layers. This explains why they stain differently.

 Choices:

- radioactivity

- acids or bases

- different types of liquids

- different types of bacteria


A:
different types of bacteria