Bacteriology QuizWelcome to the Bacteriology Quiz on Learn Microbiology. This quiz is designed to help you assess your understanding of bacterial structure, classification, physiology, pathogenesis, and lab diagnosis. Whether you're a beginner or an advanced learner, challenge yourself with questions covering Gram staining, antibiotic resistance, bacterial diseases, and more. Select the correct answer and track your score to boost your microbiology knowledge. NameEmail 1 / 30Which of the following bacteria produces diphtheria toxin? Corynebacterium diphtheriae Listeria monocytogenes Clostridium difficile Bordetella pertussis 2 / 30Which of the following bacteria is acid-fast? Klebsiella pneumoniae Mycobacterium leprae Bacillus anthracis Proteus mirabilis 3 / 30Bacteria reproduce by which method? Mitosis Budding Binary fission Conjugation 4 / 30Which of the following is an indicator organism for water quality testing? Vibrio cholerae Shigella dysenteriae Salmonella typhi Escherichia coli 5 / 30Which of the following is a Gram-positive bacterium? Escherichia coli Salmonella typhi Pseudomonas aeruginosa Staphylococcus aureus 6 / 30The main target of aminoglycosides in bacteria is: 30S ribosomal subunit DNA gyrase Cell wall 50S ribosomal subunit 7 / 30Which staining technique is used to classify bacteria as Gram-positive or Gram-negative? India ink stain Ziehl-Neelsen stain Acid-fast stain Gram stain 8 / 30Bacterial transformation involves: Bacterial sex via pili Cell lysis Viral DNA transfer Uptake of naked DNA 9 / 30Which structure is responsible for bacterial motility? Capsule Pili Flagella Ribosome 10 / 30The Quellung reaction is used to detect: Capsules Flagella Pili Endospores 11 / 30Which bacteria show swarming motility on culture media? Vibrio cholerae Salmonella typhi Proteus mirabilis Pseudomonas aeruginosa 12 / 30Bacterial capsules are primarily composed of: Nucleic acids Proteins Lipids Polysaccharides 13 / 30Which bacteria is shaped like a spiral? Vibrio Streptococcus Spirochete Bacillus 14 / 30Gram-negative bacteria have: Outer membrane with lipopolysaccharides Teichoic acids No cell wall Thick peptidoglycan layer 15 / 30The cell wall of Gram-positive bacteria is rich in: Peptidoglycan Lipopolysaccharide Mycolic acid Phospholipids 16 / 30The Lancefield classification is used for: Enterobacteriaceae Streptococci Staphylococci Clostridia 17 / 30Which antibiotic inhibits bacterial cell wall synthesis? Tetracycline Erythromycin Ciprofloxacin Penicillin 18 / 30Which of the following is a facultative anaerobe? Clostridium tetani Escherichia coli Mycobacterium tuberculosis Bacteroides fragilis 19 / 30Which bacteria is known for causing tuberculosis? Bacillus subtilis Mycobacterium tuberculosis Mycoplasma pneumoniae Streptococcus pneumoniae 20 / 30Which of the following is an obligate intracellular bacterium? Escherichia coli Chlamydia trachomatis Mycobacterium leprae Staphylococcus aureus 21 / 30Which method is used to detect bacterial endotoxin contamination in pharmaceuticals? ELISA Western blot Limulus Amebocyte Lysate (LAL) test PCR 22 / 30Which of the following is a key virulence factor of Neisseria meningitidis? Exotoxin A Endotoxin Capsule M protein 23 / 30Which bacterial genus lacks a cell wall? Corynebacterium Mycobacterium Mycoplasma Bacillus 24 / 30The term “normal flora” refers to: Harmful microbes Antibiotic-resistant bacteria Microbes that normally reside in the body without causing disease All microbes 25 / 30Which type of bacterial plasmid can confer antibiotic resistance? R plasmid Cryptic plasmid Col plasmid F plasmid 26 / 30The bacterial ribosome is of which type? 70S 80S 60S 50S 27 / 30Beta-hemolysis on blood agar is shown by: Enterococcus faecalis Viridans streptococci Streptococcus pneumoniae Streptococcus pyogenes 28 / 30Which bacteria can form spores? Clostridium botulinum Neisseria gonorrhoeae Escherichia coli Staphylococcus epidermidis 29 / 30Which bacterial enzyme helps in escaping neutrophil traps (NETs)? Beta-lactamase DNase Catalase Coagulase 30 / 30Toxins that stimulate massive cytokine release are known as: Endotoxins Neurotoxins Superantigens Enterotoxins Your score isThe average score is 63% 0% Restart quiz
