Free General Microbiology practice for NEET PG and INI-CET Microbiology, with a written explanation on every question.
6 questions · Free explanations
Showing 1–6 of 6 questions
Q1 · Gram Stain
NEET PGEasyExplanation
Gram-positive bacteria retain the crystal violet-iodine complex in their thick peptidoglycan wall and appear purple. Gram-negatives lose it during decolourisation and take up the safranin counterstain, appearing pink.
Q2 · Sterilisation
NEET PGMediumExplanation
Standard autoclaving uses saturated steam at 121 degrees C and 15 psi for 15 minutes, killing bacteria, viruses, fungi and spores. Moist heat denatures proteins more effectively than dry heat.
Q3 · Acid-fast Stain
NEET PGEasyExplanation
The Ziehl-Neelsen stain identifies acid-fast bacilli such as Mycobacterium tuberculosis, whose mycolic-acid-rich walls retain carbol fuchsin despite acid-alcohol decolourisation, appearing red on a blue background.
Q4 · Bacterial Growth Curve
HardExplanation
Cell-wall-active antibiotics such as beta-lactams work best in the log phase, when bacteria are actively dividing and synthesising peptidoglycan. Dormant cells in stationary phase are less susceptible.
Q5 · Culture Media
NEET PGMediumExplanation
Lowenstein-Jensen, an egg-based medium, is used to grow Mycobacterium tuberculosis. Thayer-Martin is for gonococci, Loeffler for diphtheria and Bordet-Gengou for pertussis.
Q6 · Disinfection
EasyExplanation
Ethylene oxide gas sterilises heat- and moisture-sensitive items such as endoscopes and plastics. It is effective but toxic, requiring adequate aeration before the item is used.
General Microbiology sits within Microbiology, which carries the same syllabus in both exams. This set runs to 6 questions, each tagged Easy, Medium or Hard, 1 of them at Hard, and 4 drawn from previous-year papers.
Answer first, then read the explanation even on the ones you got right — the reasoning is where General Microbiology marks are actually won, and it is what separates a recalled fact from a question you can solve in a new form. Once the Easy set feels comfortable, filter to Hard to find the gaps Microbiology examiners keep returning to.
FAQ
Yes. Every question and explanation in this General Microbiology set is free and open — no login, no form and no payment. The explanation appears the moment you answer.
General Microbiology sits within Microbiology, which appears in the same form in both syllabuses. Bacteria, viruses, fungi and parasites organised for fast recall, with the culture media, staining and serology facts that carry the marks.
No. No account, no password, no OTP. Answer in the browser and your answers stay on your device for the session.