Question

Why is milk an excellent bacteriological culture medium?

Answer 1

milk does contain proteins—for example, casein— well as sugars and fats that are sufficient for certain bacteria to survive. However, milk is also an iron-limited environment due to iron binding proteins such as lactoferrin.

Answer 2

The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life. ... Cells consist of cytoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids.