Antibiotics and Chemotherapeutic Agents MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Antibiotics and Chemotherapeutic Agents, a fundamental topic in the field of Microbiology. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Antibiotics and Chemotherapeutic Agents MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Antibiotics and Chemotherapeutic Agents mcq questions that explore various aspects of Antibiotics and Chemotherapeutic Agents problems. Each MCQ is crafted to challenge your understanding of Antibiotics and Chemotherapeutic Agents principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Microbiology tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Antibiotics and Chemotherapeutic Agents MCQs are your pathway to success in mastering this essential Microbiology topic.

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Antibiotics and Chemotherapeutic Agents MCQs | Page 5 of 16

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Q41.
Interference mechanism of ciprofloxacin and norfloxacin is due to their action on

a.

cell wall synthesis

b.

cell membrane function

c.

DNA function

d.

protein synthesis

Discuss
Answer: (c).DNA function
Q42.
By which of the following means antifungal chemotherapeutic agents may affect fungi?

a.

Interfere with nuclear division by preventing the aggregation of microtubules needed for mitosis

b.

Interfere with normal nucleic acid synthesis

c.

Interfere with ergosterol biosynthesis and thus alter the structure of the cytoplasmic membrane as well as the function of several membrane-bound enzymes like those involved in nutrient transport and chitin synthesis

d.

all of these

Discuss
Answer: (d).all of these
Q43.
Which of the following methods would be most appropriate for sterilizing an antibiotic solution?

a.

Dry heat sterilization

b.

Microfiltration

c.

Autoclaving

d.

Desiccation

Discuss
Answer: (b).Microfiltration
Q44.
Which of the following drugs involves modification of the drug by enzymatic modification or degradation of its active element to alter its/their resistance?

a.

Pencillins

b.

Choloramphenicol

c.

Aminoglyosides

d.

All of these

Discuss
Answer: (d).All of these
Q45.
Who developed the concept of specific toxicity?

a.

Pasteur

b.

Fleming

c.

Watson

d.

Ehrlich

Discuss
Answer: (d).Ehrlich
Q46.
When using alcohol as an antiseptic, which concentration is considered most effective?

a.

95%

b.

50%

c.

70%

d.

25%

Discuss
Answer: (c).70%
Q47.
Fluoroquinolones are antibiotics which inhibit

a.

DNA polymerase

b.

RNA polymerase

c.

DNA gyrase

d.

Cross-linking of peptidoglycan

Discuss
Answer: (c).DNA gyrase
Q48.
Which of the following is used only in life-threatening situations when no other drug is adequate?

a.

Penicillin

b.

Tetracycline

c.

Chloramphenicol

d.

Streptomycin

Discuss
Answer: (c).Chloramphenicol
Q49.
The susceptibility of a microorganism to antibiotics and other chemotherapeutic agents can be determined by using

a.

tube dilution technique

b.

paper disk plate

c.

both (a) and (b)

d.

none of these

Discuss
Answer: (c).both (a) and (b)
Q50.
Most antibiotics are isolated from

a.

viruses

b.

aquatic microorganisms

c.

soil microorganisms

d.

plants

Discuss
Answer: (c).soil microorganisms
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