Question

multiple select question
select all that apply
media ingredients that cannot be chemically defined include which of the following? more than one answer may be correct.

cell secretions

blood and serum

extracts of animals, plants, or yeasts

sodium chloride

disodium hydrogen phosphate

Explanation:

• Cell secretions: Their composition is complex and variable, so they can't be chemically defined precisely.
• Blood and serum: Contain a wide range of components with variable amounts, not easily chemically defined.
• Extracts of animals, plants, or yeasts: These are complex mixtures with undefined or variable chemical compositions.
• Sodium chloride: Has a definite chemical formula (NaCl) and can be chemically defined.
• Disodium hydrogen phosphate: Has a definite chemical formula ($\text{Na}_2\text{HPO}_4$) and can be chemically defined.

Answer:

A. cell secretions, B. blood and serum, C. extracts of animals, plants, or yeasts