SZABMU AHS 2026 Bacteriology Free Quiz 6

1. What is the role of the stringent response in bacteria?

A. Regulation of DNA repair B. Regulation of cell division C. Regulation of sporulation D. Regulation of transcription and translation under stress

2. Which molecular system allows bacteria to sense and respond to environmental stimuli?

A. Sensor kinase and response regulator B. Riboswitch and attenuator C. Sigma factor and promoter D. Operon and repressor

3. What bacterial system provides acquired immunity against bacteriophages?

A. Restriction-modification B. CRISPR-Cas C. Transposons D. Plasmids

4. Which mechanism involves a high-frequency recombination (Hfr) strain to transfer chromosomal genes?

A. Transformation B. Transduction C. Conjugation with Hfr D. Gene duplication

5. What proteins are responsible for promoter recognition in bacterial transcription?

A. Ribosomes B. Sigma factors C. Transcription factors D. Operators

6. Which bacterial DNA repair system is triggered by extensive DNA damage and is error-prone?

A. RecA and LexA B. UvrABC system C. Mismatch repair D. Base excision repair

7. What is the molecular target of tetanus toxin?

A. Cleave acetylcholine B. Cleave SNARE proteins C. Inhibit DNA replication D. Block protein synthesis

8. Which part of LPS is responsible for endotoxic activity?

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

9. What are type IV pili primarily involved in besides adhesion?

A. Conjugation B. Adhesion only C. Twitching motility and biofilm formation D. Secretion of toxins

10. What drives the rotation of bacterial flagella?

A. Proton motive force B. ATP hydrolysis C. Electron transport D. Light energy