BIOD 171 Microbiology Module 4 Exam |
2026-2027 Actual Exam | Portage Learning,
Exams of Biology
T/F: Growth media is best suited for distinguishing between tw
o similar species of bacteria ......answer... 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 lactos
e, which type of media would be best suited? ......answer. ....Diff
erential media
What are the requirements of a fastidious microbe? .......answer
. ... A fastidious microbe is an organism with complex growth re
c
quirements and will not grow without then. Enriched medias t
hus contain these specific and essential nutrients required for t
he growth of a particular subset of microorganisms.
T/F: LB agar is classified as a non-selective, non-
differential media ......answer. ... True
,The polysaccharide-
based hardening agent added to LB media to produce LB agar is
derived from what? ......answer. .. Seaweed extract
Blood agar is which type of medium? Select all that apply:
- Selective and Differential
- Enriched
- Differential
- Selective ......answer. ..- Enriched
- Differential
Match the following hemolytic class with its description of acti
vity:
1. Alpha hemolysis
, 2. Beta hemolysis
3. Gamma hemolysis
A. No change
B. Greenish-brown color
C. Distinct zone of clearing ......answer. .... 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 acti
vity:
1. Alpha hemolysis
2026-2027 Actual Exam | Portage Learning,
Exams of Biology
T/F: Growth media is best suited for distinguishing between tw
o similar species of bacteria ......answer... 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 lactos
e, which type of media would be best suited? ......answer. ....Diff
erential media
What are the requirements of a fastidious microbe? .......answer
. ... A fastidious microbe is an organism with complex growth re
c
quirements and will not grow without then. Enriched medias t
hus contain these specific and essential nutrients required for t
he growth of a particular subset of microorganisms.
T/F: LB agar is classified as a non-selective, non-
differential media ......answer. ... True
,The polysaccharide-
based hardening agent added to LB media to produce LB agar is
derived from what? ......answer. .. Seaweed extract
Blood agar is which type of medium? Select all that apply:
- Selective and Differential
- Enriched
- Differential
- Selective ......answer. ..- Enriched
- Differential
Match the following hemolytic class with its description of acti
vity:
1. Alpha hemolysis
, 2. Beta hemolysis
3. Gamma hemolysis
A. No change
B. Greenish-brown color
C. Distinct zone of clearing ......answer. .... 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 acti
vity:
1. Alpha hemolysis
