BIOD171 PORTAGE LEARNING MODULE 4 EXAM
QUESTIONS AND CORRECT ANSWERS (2025-2026)
QUESTION |1
T/F: |Growth |media |is |best |suited |for |distinguishing |between |two |similar |species |of |bacteria
False
growth |media |is |designed |to |simply |support |(and |not |restrict) |microbial |growth
QUESTION |2
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?
Differential |media
QUESTION |3
What |are |the |requirements |of |a |fastidious |microbe?
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.
QUESTION |4
T/F: |LB |agar |is |classified |as |a |non-selective, |non-differential |media
True
, QUESTION |5
The |polysaccharide-based |hardening |agent |added |to |LB |media |to |produce |LB |agar |is |derived |from
|what?
Seaweed |extract
QUESTION |6
Blood |agar |is |which |type |of |medium? |Select |all |that |apply:
- Selective |and |Differential
- Enriched
- Differential
- Selective
- Enriched
- Differential
QUESTION |7
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
1. Alpha |hemolysis- |Greenish-brown |color |(B)
2. Beta |hemolysis- |Distinct |zone |of |clearing |(C)
3. Gamma |hemolysis- |No |change |(A)
QUESTION |8
Match |the |following |hemolytic |class |with |its |description |of |activity:
QUESTIONS AND CORRECT ANSWERS (2025-2026)
QUESTION |1
T/F: |Growth |media |is |best |suited |for |distinguishing |between |two |similar |species |of |bacteria
False
growth |media |is |designed |to |simply |support |(and |not |restrict) |microbial |growth
QUESTION |2
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?
Differential |media
QUESTION |3
What |are |the |requirements |of |a |fastidious |microbe?
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.
QUESTION |4
T/F: |LB |agar |is |classified |as |a |non-selective, |non-differential |media
True
, QUESTION |5
The |polysaccharide-based |hardening |agent |added |to |LB |media |to |produce |LB |agar |is |derived |from
|what?
Seaweed |extract
QUESTION |6
Blood |agar |is |which |type |of |medium? |Select |all |that |apply:
- Selective |and |Differential
- Enriched
- Differential
- Selective
- Enriched
- Differential
QUESTION |7
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
1. Alpha |hemolysis- |Greenish-brown |color |(B)
2. Beta |hemolysis- |Distinct |zone |of |clearing |(C)
3. Gamma |hemolysis- |No |change |(A)
QUESTION |8
Match |the |following |hemolytic |class |with |its |description |of |activity:
