Question

question 7 (1 point) saved
what type of medium has a composition that is chemically defined?
synthetic
nonsynthetic
complex
infusion
question 8 (1 point) saved
sabourauds agar is slightly acidic to aid in the growth of fungi. we would classify this medium as differential.
true
false
question 9 (1 point) saved
in a ______________ stain, the background is stained and the organism appears clear against a dark background.
positive
negative
gram
differential

Explanation:

• Question 7: A synthetic medium has a precisely known chemical composition. Non - synthetic (complex) media have undefined components. Infusion is a type of complex medium.
• Question 8: Sabouraud's agar is a selective medium (selects for fungi due to its acidic pH), not a differential medium. Differential media are used to distinguish between different types of microorganisms based on their biochemical reactions.
• Question 9: In a negative stain, the background is stained, and the organism is clear. In a positive stain, the organism is stained. Gram stain is a type of differential stain.

Answer:

• Question 7: synthetic
• Question 8: False
• Question 9: negative