SZABMU AHS 2026 Bacteriology Free Quiz 9

1. What is the term for movement in response to chemical gradients?

A. Phototaxis B. Chemotaxis C. Aerotaxis D. Osmoregulation

2. What is the role of Dam methylation in bacteria?

A. Gene expression only B. Replication initiation and mismatch repair C. Transcription termination D. Translation

3. What can serve as a terminal electron acceptor in anaerobic bacterial respiration?

A. Oxygen B. Nitrate C. Sulfate D. Carbon dioxide

4. Which proteins constitute the stator of the bacterial flagellar motor?

A. MotA/MotB proton flow B. ATP synthase C. Electron transport chain D. Light energy

5. What is the role of toxin-antitoxin systems in bacteria?

A. Apoptosis B. Growth arrest C. Sporulation D. Biofilm formation

6. Which part of LPS determines the serotype of Gram-negative bacteria?

A. Lipid A B. Core oligosaccharide C. O-antigen D. Teichoic acid

7. What type of molecules are autoinducers in Gram-negative quorum sensing?

A. Peptides B. Acyl-homoserine lactones C. Lipoproteins D. Exopolysaccharides

8. Which type of plasmid is most associated with antibiotic resistance?

A. R plasmids B. F plasmids C. Col plasmids D. Virulence plasmids

9. Which proteins are the bacterial homologs of tubulin and actin?

A. FtsZ and MreB B. MreB and FtsZ C. ParM and MamK D. CreS and Ccrp

10. Where is the electron transport chain located in bacteria?

A. Mitochondrial inner membrane B. Plasma membrane C. Cytoplasm D. Periplasm