BIOD 171: MODULE 4 Exam questions with verified answers

BIOD 171: MODULE 4 Exam questions with verified answers T/F: Growth media is best suited for distinguishing between two similar species of bacteria - CORRECT ANS-False growth media is designed to simply support (and not restrict) microbial growth A researcher is asked to determine which of two vials contains E coli and which contains salmonella. Knowing both are Gram-negative while only one of them is capable of fermenting lactose, which type of media would be best suited? - CORRECT ANS-Differential media What are the requirements of a fastidious microbe? - CORRECT ANS-A fastidious microbe is an organism with complex growth requirements and will not grow without then. Enriched medias thus contain these specific and essential nutrients required for the growth of a particular subset of microorganisms. T/F: LB agar is classified as a non-selective, non-differential media - CORRECT ANS-True The polysaccharide-based hardening agent added to LB media to produce LB agar is derived from what? - CORRECT ANS-Seaweed extract Blood agar is which type of medium? Select all that apply: - Selective and Differential - Enriched - Differential - Selective - CORRECT ANS-- Enriched - Differential Match the following hemolytic class with its description of activity: 1. Alpha hemolysis 2. Beta hemolysis 3. Gamma hemolysis A. No change B. Greenish-brown color C. Distinct zone of clearing - CORRECT ANS-1. Alpha hemolysis- Greenish-brown color (B) 2. Beta hemolysis- Distinct zone of clearing (C) 3. Gamma hemolysis- No change (A) Match the following hemolytic class with its description of activity: 1. Alpha hemolysis 2. Beta hemolysis 3. Gamma hemolysis A. No hemolytic activity B. Incomplete hemolytic activity C. Complete hemolytic activity - CORRECT ANS-1. Alpha hemolysis- Incomplete hemolytic activity (B) 2. Beta hemolysis- Complete hemolytic activity (C) 3. Gamma hemolysis- No hemolytic activity (A)