BIMM 121 EXAM 1 questions and
correct answers graded A+
What is the importance of aseptic technique? - correct answer ✔✔ It eliminates the risk of
contamination, and prevents other microbes in the environment from growing on the plate
What is the one ingredient that can differentiate between solid and liquid media? - correct
answer ✔✔ Agar
What is agar? - correct answer ✔✔ A complex polysaccharide extracted from red algae
Chemically defined media - correct answer ✔✔ The exact chemical composition is known
What is an example of a chemically defined media? - correct answer ✔✔ SOC media
Complex media - correct answer ✔✔ The extracts and digests of yeasts, meat, or plants, which
composition varies slightly from batch to batch. We don't know the exact chemical formula
What is the importance of the streak plate method? - correct answer ✔✔ Used to isolate pure
colonies, by diluting the concentration of bacteria
What is tryptic soy agar (TSA) used for? - correct answer ✔✔ Used to isolate microbes from
surfaces
Why are TSA and TSB not ideal for identifying specific microbes from a mixed population? -
correct answer ✔✔ Everything grows on the plate
correct answers graded A+
What is the importance of aseptic technique? - correct answer ✔✔ It eliminates the risk of
contamination, and prevents other microbes in the environment from growing on the plate
What is the one ingredient that can differentiate between solid and liquid media? - correct
answer ✔✔ Agar
What is agar? - correct answer ✔✔ A complex polysaccharide extracted from red algae
Chemically defined media - correct answer ✔✔ The exact chemical composition is known
What is an example of a chemically defined media? - correct answer ✔✔ SOC media
Complex media - correct answer ✔✔ The extracts and digests of yeasts, meat, or plants, which
composition varies slightly from batch to batch. We don't know the exact chemical formula
What is the importance of the streak plate method? - correct answer ✔✔ Used to isolate pure
colonies, by diluting the concentration of bacteria
What is tryptic soy agar (TSA) used for? - correct answer ✔✔ Used to isolate microbes from
surfaces
Why are TSA and TSB not ideal for identifying specific microbes from a mixed population? -
correct answer ✔✔ Everything grows on the plate
