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 / 30Bacterial capsules are primarily composed of: Nucleic acids Polysaccharides Lipids Proteins 2 / 30The bacterial ribosome is of which type? 60S 70S 80S 50S 3 / 30The term “normal flora” refers to: Microbes that normally reside in the body without causing disease All microbes Antibiotic-resistant bacteria Harmful microbes 4 / 30Bacterial transformation involves: Uptake of naked DNA Cell lysis Bacterial sex via pili Viral DNA transfer 5 / 30Beta-hemolysis on blood agar is shown by: Viridans streptococci Streptococcus pyogenes Enterococcus faecalis Streptococcus pneumoniae 6 / 30Which of the following is an indicator organism for water quality testing? Escherichia coli Salmonella typhi Vibrio cholerae Shigella dysenteriae 7 / 30Bacteria reproduce by which method? Mitosis Binary fission Budding Conjugation 8 / 30Which of the following is a key virulence factor of Neisseria meningitidis? Capsule Exotoxin A Endotoxin M protein 9 / 30Which structure is responsible for bacterial motility? Flagella Pili Ribosome Capsule 10 / 30Gram-negative bacteria have: Teichoic acids Thick peptidoglycan layer No cell wall Outer membrane with lipopolysaccharides 11 / 30Which of the following is an obligate intracellular bacterium? Staphylococcus aureus Mycobacterium leprae Escherichia coli Chlamydia trachomatis 12 / 30The main target of aminoglycosides in bacteria is: Cell wall DNA gyrase 50S ribosomal subunit 30S ribosomal subunit 13 / 30Which of the following is a Gram-positive bacterium? Salmonella typhi Escherichia coli Staphylococcus aureus Pseudomonas aeruginosa 14 / 30Which antibiotic inhibits bacterial cell wall synthesis? Ciprofloxacin Tetracycline Penicillin Erythromycin 15 / 30Which bacteria can form spores? Clostridium botulinum Neisseria gonorrhoeae Staphylococcus epidermidis Escherichia coli 16 / 30Which of the following is a facultative anaerobe? Escherichia coli Clostridium tetani Bacteroides fragilis Mycobacterium tuberculosis 17 / 30The Quellung reaction is used to detect: Endospores Pili Capsules Flagella 18 / 30Which bacteria show swarming motility on culture media? Salmonella typhi Proteus mirabilis Vibrio cholerae Pseudomonas aeruginosa 19 / 30Which bacteria is shaped like a spiral? Vibrio Spirochete Bacillus Streptococcus 20 / 30Toxins that stimulate massive cytokine release are known as: Enterotoxins Neurotoxins Superantigens Endotoxins 21 / 30Which of the following bacteria produces diphtheria toxin? Listeria monocytogenes Corynebacterium diphtheriae Clostridium difficile Bordetella pertussis 22 / 30The cell wall of Gram-positive bacteria is rich in: Peptidoglycan Mycolic acid Lipopolysaccharide Phospholipids 23 / 30Which staining technique is used to classify bacteria as Gram-positive or Gram-negative? India ink stain Ziehl-Neelsen stain Gram stain Acid-fast stain 24 / 30Which method is used to detect bacterial endotoxin contamination in pharmaceuticals? ELISA Limulus Amebocyte Lysate (LAL) test Western blot PCR 25 / 30Which bacteria is known for causing tuberculosis? Bacillus subtilis Mycobacterium tuberculosis Mycoplasma pneumoniae Streptococcus pneumoniae 26 / 30The Lancefield classification is used for: Enterobacteriaceae Clostridia Staphylococci Streptococci 27 / 30Which bacterial genus lacks a cell wall? Mycobacterium Mycoplasma Corynebacterium Bacillus 28 / 30Which bacterial enzyme helps in escaping neutrophil traps (NETs)? Beta-lactamase Coagulase Catalase DNase 29 / 30Which of the following bacteria is acid-fast? Proteus mirabilis Mycobacterium leprae Klebsiella pneumoniae Bacillus anthracis 30 / 30Which type of bacterial plasmid can confer antibiotic resistance? Col plasmid F plasmid Cryptic plasmid R plasmid Your score isThe average score is 62% 0% Restart quiz
