Culture media (growth media) contains nutrients, designed to grow bacteria or microorganisms. Different cell types are grown in various types of medium. Nutrient broths and agar plates are the most typical growth media for microorganisms. Transport Media for microorganisms are essentially buffer solutions containing carbohydrates, peptones and other nutrients to keep the microorganism stable during transportation. Viral transport medium preserves virus specimens after collection so that they can be transported and analyzed at a lab.