

MCQOPTIONS
This section includes 24 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
1. |
Certain strains of var. may produce |
A. | bitter flavor |
B. | acid flavor |
C. | burnt or caramel flavor |
D. | none of these |
Answer» D. none of these | |
2. |
in butter which is blamed on is also called as |
A. | rabbito |
B. | putridity |
C. | both (a) and (b) |
D. | none of these |
Answer» D. none of these | |
3. |
produces a |
A. | bluish gray to brownish color in milk in its pure form |
B. | brownish color to bluish gray in milk in its pure form |
C. | gray to brownish color in milk |
D. | yellow color in milk |
Answer» B. brownish color to bluish gray in milk in its pure form | |
4. |
in mildly salted butter may cause |
A. | black smudge |
B. | greenish areas |
C. | pink color |
D. | none of these |
Answer» B. greenish areas | |
5. |
Surface taint in butter which is blamed on Pseudomonas putrefaciens is also called as |
A. | rabbito |
B. | putridity |
C. | both (a) and (b) |
D. | none of these |
Answer» D. none of these | |
6. |
Pseudomonas nigrifaciens in mildly salted butter may cause |
A. | black smudge |
B. | greenish areas |
C. | pink color |
D. | none of these |
Answer» B. greenish areas | |
7. |
Esters like flavors in butter are resulted from the action of |
A. | <i>P. mephitica</i> |
B. | <i>Aeromonas hydrophila</i> |
C. | <i>P. fragi</i> |
D. | <i>Pseudomonas synxantha</i> |
Answer» D. <i>Pseudomonas synxantha</i> | |
8. |
Ropiness caused by Enterobacter usually is |
A. | worse at the middle of the milk |
B. | worse at the bottom of the milk |
C. | worse near the top of the milk |
D. | all of these |
Answer» D. all of these | |
9. |
A brown color in milk may result from |
A. | <i>Pseudomonas putrefaciens</i> |
B. | the enzymatic oxidation of tyrosine by |
C. | <i> P. fluorescens</i> |
D. | both (a) and (b) |
E. | <i>S. marcescens</i> |
Answer» D. both (a) and (b) | |
10. |
Which of the following species of Clostridium is responsible for formation of dark green to black colours in cheese? |
A. | <i>Clostridium tyrobutyricum</i> |
B. | <i>Clostridium sporogenes</i> |
C. | <i>Clostridium herbarum</i> |
D. | None of these |
Answer» D. None of these | |
11. |
Certain strains of Streptococcus lactis var. maltigenes may produce |
A. | bitter flavor |
B. | acid flavor |
C. | burnt or caramel flavor |
D. | none of these |
Answer» D. none of these | |
12. |
Cheese with too low an acidity because of the addition of cream or the failure of the starter often is made gelatinous or slimy by |
A. | Pseudomonas |
B. | <i>P. fragi</i> |
C. | <i>Alcaligenes metalcaligenes</i> |
D. | all of these |
Answer» E. | |
13. |
Pseudomonas syncyanea produces a |
A. | bluish gray to brownish color in milk in its pure form |
B. | brownish color to bluish gray in milk in its pure form |
C. | gray to brownish color in milk |
D. | yellow color in milk |
Answer» B. brownish color to bluish gray in milk in its pure form | |
14. |
Acidophilus milk which is used for its therapeutic properties in intestinal disorders requires for its manufacture a pure culture of |
A. | <i>Lactobacillus bulgaricus</i> |
B. | <i>Streptococcus thermophilics</i> |
C. | <i>Lactobacillus acidophilus</i> |
D. | None of the above |
Answer» D. None of the above | |
15. |
A yellow color in the creamy layer of milk may be caused by |
A. | <i>Pseudomonas synxantha</i> |
B. | <i>Pseudomonas syncyanea</i> |
C. | both (a) and (b) |
D. | <i>S. marcescens</i> |
Answer» B. <i>Pseudomonas syncyanea</i> | |
16. |
An alkaline reaction in milk is caused by the alkali formers bacteria as |
A. | <i>Pseudomonas fluorescens</i> |
B. | <i>A. viscolactis</i> |
C. | both (a) and (b) |
D. | none of these |
Answer» D. none of these | |
17. |
Bacterial ropiness in milk is caused by |
A. | slimy capsular material from the cells usually gums or mucins |
B. | slimy capsular material from the cells usually proteins |
C. | slimy capsular material from the cells usually lipids |
D. | all of the above |
Answer» B. slimy capsular material from the cells usually proteins | |
18. |
Fishiness in butter is caused by |
A. | <i>Aeromonas hydrophila</i> |
B. | <i>Pseudomonas synxantha</i> |
C. | <i>Pseudomonas syncyanea</i> |
D. | none of these |
Answer» B. <i>Pseudomonas synxantha</i> | |
19. |
The chief type of spoilage in sweetened condensed milk may be |
A. | gas formation by sucrose fermenting yeasts |
B. | thickening caused by micrococci |
C. | mold colonies growing on the surface |
D. | all of the above |
Answer» E. | |
20. |
Non bacterial ropiness or sliminess in milk and milk products may be due to the |
A. | stringiness caused by mastitis and in particular by fibrin and leucocytes from the cow's blood. |
B. | sliminess resulting from the thickness of the cream |
C. | stringiness due to thin films of casein or lactalbumin during cooling |
D. | all of the above |
Answer» E. | |
21. |
The yoghurt is made from |
A. | <i>Lactobacillus bulgaricus</i> |
B. | <i>Streptococcus thermophilus</i> |
C. | <i>S. cremoris</i> |
D. | mixed culture of (a) and (b) |
Answer» E. | |
22. |
Cheese cancer of Swiss and similar cheese is caused by |
A. | <i>Oospora Crustacea</i> |
B. | <i>Oospora caseovorans</i> |
C. | <i>Oospora aurianticum</i> |
D. | none of these |
Answer» C. <i>Oospora aurianticum</i> | |
23. |
Swelling of the can is caused primarily by |
A. | gas forming, anaerobic spore formers |
B. | gas forming, aerobic spore formers |
C. | both (a) and (b) |
D. | none of these |
Answer» B. gas forming, aerobic spore formers | |
24. |
Bulgarian butter milk is made with the help of |
A. | <i>Lactobacillus bulgaricus</i> |
B. | <i>Streptococcus lactis</i> |
C. | <i>Streptococcus thermophilus</i> |
D. | <i>S. cremoris</i> |
Answer» B. <i>Streptococcus lactis</i> | |