BIOD 171: MODULE 4 EXAM 2025
QUESTIONS AND 100% DETAILED
ANSWERS PASS+
, 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 ANSWER- Differential media
T/F: Growth media is best suited for distinguishing between two similar species of
bacteria - CORRECT ANSWER-False
growth media is designed to simply support (and not restrict) microbial growth
What are the requirements of a fastidious microbe? - CORRECT ANSWER
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
ANSWER-True
The polysaccharide-based hardening agent added to LB media to produce LB agar
is derived from what? - CORRECT ANSWER-Seaweed extract
Blood agar is which type of medium? Select all that apply:
- Selective and Differential
- Enriched
- Differential
- Selective - CORRECT ANSWER-- 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
QUESTIONS AND 100% DETAILED
ANSWERS PASS+
, 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 ANSWER- Differential media
T/F: Growth media is best suited for distinguishing between two similar species of
bacteria - CORRECT ANSWER-False
growth media is designed to simply support (and not restrict) microbial growth
What are the requirements of a fastidious microbe? - CORRECT ANSWER
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
ANSWER-True
The polysaccharide-based hardening agent added to LB media to produce LB agar
is derived from what? - CORRECT ANSWER-Seaweed extract
Blood agar is which type of medium? Select all that apply:
- Selective and Differential
- Enriched
- Differential
- Selective - CORRECT ANSWER-- 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
