biology : class12 Penicillin : Food Processing, Industrial Production, Sewage Treatment, Energy Production : Microbes in Human Welfare MCQ Questions and Answers
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Penicillin
MCQ questions and answers.
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MCQ Questions
1. Who discovered penicillin?
A.
Alexander Fleming
B.
Louis Pasteur
C.
Robert Koch
D.
Edward Jenner
Correct Answer:
Alexander Fleming
Explanation:
Alexander Fleming discovered penicillin in 1928 while observing that a mold inhibited the growth of bacteria.
2. Penicillin was originally obtained from which microorganism?
A.
Penicillium notatum
B.
Saccharomyces cerevisiae
C.
Lactobacillus bulgaricus
D.
Aspergillus niger
Correct Answer:
Penicillium notatum
Explanation:
Penicillin was originally obtained from the fungus Penicillium notatum.
3. Penicillin is primarily used as a:
A.
Bacterial antibiotic
B.
Viral vaccine
C.
Fungal nutrient
D.
Digestive enzyme
Correct Answer:
Bacterial antibiotic
Explanation:
Penicillin is an antibiotic used to treat infections caused by susceptible bacteria.
4. What observation led Alexander Fleming to discover penicillin?
A.
A mold prevented bacterial growth around it
B.
Bacteria produced alcohol in sugar solution
C.
Yeast changed color in milk
D.
A virus increased the growth of mold
Correct Answer:
A mold prevented bacterial growth around it
Explanation:
Fleming noticed a clear region around the mold colony where bacteria did not grow.
5. The clear region around a Penicillium colony on a bacterial culture plate is called the:
A.
Zone of inhibition
B.
Fermentation zone
C.
Growth ring
D.
Spore zone
Correct Answer:
Zone of inhibition
Explanation:
The zone of inhibition is the clear area where penicillin prevents the growth of bacteria.
6. Penicillin is produced by which type of organism?
A.
Fungus
B.
Virus
C.
Protozoan
D.
Alga
Correct Answer:
Fungus
Explanation:
Penicillin is produced by species of the fungus Penicillium.
7. Penicillin acts mainly by inhibiting the growth of:
A.
Bacteria
B.
Mosses
C.
Insects
D.
Earthworms
Correct Answer:
Bacteria
Explanation:
Penicillin inhibits the growth of susceptible bacteria and is therefore classified as an antibacterial antibiotic.
8. Which substance from Penicillium has antibiotic properties?
A.
Penicillin
B.
Ethanol
C.
Lactic acid
D.
Methane
Correct Answer:
Penicillin
Explanation:
Penicillin is the antibiotic substance produced by Penicillium and used to control bacterial infections.
9. Penicillin is an example of a:
A.
Bioactive molecule
B.
Structural carbohydrate
C.
Photosynthetic pigment
D.
Digestive hormone
Correct Answer:
Bioactive molecule
Explanation:
Penicillin is a bioactive molecule produced by a microorganism and used for its medicinal effect.
10. The discovery of penicillin demonstrated that some microorganisms can produce substances that:
A.
Kill or inhibit other microorganisms
B.
Convert sunlight into starch
C.
Increase the size of plant seeds
D.
Turn proteins directly into vitamins
Correct Answer:
Kill or inhibit other microorganisms
Explanation:
Penicillin produced by Penicillium can kill or inhibit susceptible bacteria, showing the medical importance of microbial products.
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