Biology MCQs with Answers

This is Biology MCQs section with detailed explanations for preparation of screening tests, interviews for government jobs. In this section candidate will learn MCQs on variety of topics from the subject.

1. 1 The milk streptococci produce acetoin that gets spontaneously oxidized yielding a flavorings agent (responsible for aroma of butter) that is
   

   1. acetone

   2. acetyl coA

   3. butyric acid

   4. diacetyl

   See Answer

   Added By: Admin

   Answer

   : diacetyl

   Explanation

   :
   N/A

2. 2 Staphylococcal intoxication is caused by the toxin m the food from
   

   1. Staphylococcus aureus

   2. S. cerevisiae

   3. S. thermophillus

   4. none of these

   See Answer

   Added By: Admin

   Answer

   : Staphylococcus aureus

   Explanation

   :
   N/A

3. 3 The botulism intoxication occurs due to
   

   1. an enterotoxin

   2. neurotoxin

   3. mycotoxin

   4. all of these

   See Answer

   Added By: Admin

   Answer

   : neurotoxin

   Explanation

   :
   N/A

4. 4 The Bacillus cereus causes gasteroenteritis by the production of an exoenterotoxin which is released in food as a result of
   

   1. cell growth

   2. cell autolysis

   3. cell permeation

   4. cell damage

   See Answer

   Added By: Admin

   Answer

   : cell autolysis

   Explanation

   :
   N/A

5. 5 Arrange the potencies of toxin in descending order of the following canned foods
   

   1. peas>string beans>spinach> corn

   2. corn> string bean>peas>spinach

   3. corn> spinach> peas>string beans

   4. corn> peas>string beans>spinach

   See Answer

   Added By: Admin

   Answer

   : corn> peas>string beans>spinach

   Explanation

   :
   N/A

6. 6 The application of Gamma rays destroys botulism toxin. The dose of gamma rays required for this purpose is
   

   1. 73 Gy

   2. 73 Rad

   3. 7.3 Mrad

   4. 173 Rad

   See Answer

   Added By: Admin

   Answer

   : 7.3 Mrad

   Explanation

   :
   N/A

7. 7 Group I C. botulinum strains generally includes in
   

   1. all types of strains (proteolytic)A, B and F

   2. all types of strains (non-proteolytic) E and F

   3. all types of strains (proteolytic)C, D and F

   4. none of the above

   See Answer

   Added By: Admin

   Answer

   : all types of strains (proteolytic)A, B and F

   Explanation

   :
   N/A

8. 8 Salmonellois is caused by the
   

   1. enterotoxin of Salmonella spp

   2. endotoxin of Salmonella spp

   3. neurotoxin of Salmonella spp

   4. exoenterotoxin of Salmonella spp

   See Answer

   Added By: Admin

   Answer

   : endotoxin of Salmonella spp

   Explanation

   :
   N/A

9. 9 Which of the following is true to prevent botulism from smoked fish?
   

   1. The fish should be heated at its coolest part to at least 82°C for 30 min during or after smoking

   2. Fish should be immediately frozen after packaging and kept frozen

   3. Good sanitation should be maintained throughout production and handling

   4. All of the above

   See Answer

   Added By: Admin

   Answer

   : All of the above

   Explanation

   :
   N/A

10. 10 The method of successful treatment of botulism prior to appearance of botulism symptoms involve administration of
    

    1. antibiotic

    2. analgesic

    3. antitoxin

    4. antipyretic

    See Answer

    Added By: Admin

    Answer

    : antitoxin

    Explanation

    :
    N/A