Chapter Exam

Chapter 7: Medical Bacteriology — Online MCQ Test

Q: Which bacterium is commonly associated with food poisoning and skin infections and appears in clusters under the microscope?

Answer: A. Staphylococcus aureus — Staphylococcus aureus is a Gram-positive coccus arranged in clusters. It is a common cause of skin infections and food poisoning.

Q: Tuberculosis is primarily caused by which bacterium?

Answer: B. Mycobacterium tuberculosis — Mycobacterium tuberculosis is the causative agent of tuberculosis. It mainly affects the lungs but can also infect other organs.

MICROBIOLOGY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 7: Medical Bacteriology with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th MICROBIOLOGY. This chapter covers: This clinical chapter details major pathogenic bacteria affecting humans such as Staphylococcus and Mycobacterium tuberculosis. It covers bacterial morphology virulence factors tra.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 7: Medical Bacteriology — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th MICROBIOLOGY — Chapter 7: Medical Bacteriology, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which bacterium is commonly associated with food poisoning and skin infections and appears in clusters under the microscope?

A. Staphylococcus aureus ✓
B. Mycobacterium tuberculosis
C. Vibrio cholerae
D. Salmonella typhi

Answer: A. Staphylococcus aureus
Staphylococcus aureus is a Gram-positive coccus arranged in clusters. It is a common cause of skin infections and food poisoning.

Tuberculosis is primarily caused by which bacterium?

A. Streptococcus pyogenes
B. Mycobacterium tuberculosis ✓
C. Escherichia coli
D. Bacillus anthracis

Answer: B. Mycobacterium tuberculosis
Mycobacterium tuberculosis is the causative agent of tuberculosis. It mainly affects the lungs but can also infect other organs.

Why is Staphylococcus aureus considered pathogenic?

A. It produces virulence factors such as toxins and enzymes ✓
B. It cannot multiply in the human body
C. It is always harmless in humans
D. It lives only in water

Answer: A. It produces virulence factors such as toxins and enzymes
Staphylococcus aureus produces several virulence factors, including toxins and enzymes, which help it cause disease. These factors aid invasion and tissue damage.

Which statement best explains why tuberculosis is difficult to treat?

A. The bacterium grows extremely fast and dies easily
B. The bacterium has a waxy cell wall and requires prolonged treatment ✓
C. The bacterium produces only harmless toxins
D. The bacterium cannot be detected in sputum

Answer: B. The bacterium has a waxy cell wall and requires prolonged treatment
Mycobacterium tuberculosis has a waxy, lipid-rich cell wall that makes it resistant to many conditions and drugs. Hence, prolonged treatment is necessary.

Which of the following is the most accurate statement regarding the spread of Staphylococcus aureus in clinical settings?

A. It spreads only through water and soil
B. It commonly spreads by direct contact and contaminated objects ✓
C. It is spread mainly by mosquito bite
D. It spreads only through food and not through skin contact

Answer: B. It commonly spreads by direct contact and contaminated objects
Staphylococcus aureus is commonly transmitted by direct contact, contaminated hands, instruments, and surfaces. This is why hospital hygiene is important.