Certified Ophthalmic Assistant Practice Exam

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What is a common substance used to culture microorganisms?

Agar
Blood
Serum
Plasma

The correct answer is: Agar

Agar is a common substance used to culture microorganisms because it provides a solid surface for bacterial growth. Agar is a gelatinous substance derived from seaweed and is an ideal medium for cultivating various types of microorganisms due to its ability to remain solid at room temperature, while also being able to hold moisture and nutrients necessary for microbial growth. While blood, serum, and plasma are components of the blood and can be used in specific laboratory tests in ophthalmology and other medical fields, they are not typically used as culture mediums for microorganisms.