Bacteria Knowledge-Based Download PDF

Questions

1. 1.

   Which small, extrachromosomal, circular DNA molecule replicates independently of the main bacterial chromosome and frequently carries genes conferring antibiotic resistance?

   • A) Nucleoid
   • B) Plasmid
   • C) Histone
   • D) Operon
2. 2.

   Which specialized, dormant structure allows certain bacteria, such as species of Bacillus and Clostridium, to survive extreme environmental conditions including high temperatures, desiccation, and chemical disinfectants?

   • A) Capsule
   • B) Plasmid
   • C) Inclusion body
   • D) Endospore
3. 3.

   Which of the following structural components is uniquely present in the cell envelope of Gram-negative bacteria compared to Gram-positive bacteria?

   • A) An outer membrane containing lipopolysaccharides
   • B) A thick layer of peptidoglycan containing teichoic acids
   • C) An inner plasma membrane composed of a phospholipid bilayer
   • D) A circular chromosome located within the nucleoid region
4. 4.

   Which process allows a bacterium to transfer genetic material directly to a recipient bacterium through cell-to-cell contact involving a specialized structure known as a pilus?

   • A) Transformation
   • B) Conjugation
   • C) Transduction
   • D) Binary fission
5. 5.

   Which of the following structural features is characteristic of all bacterial cells?

   • A) A membrane-bound nucleus enclosing genomic DNA
   • B) Membrane-bound mitochondria for aerobic ATP generation
   • C) 70S ribosomes distributed throughout the cytoplasm
   • D) An extensive network of rough endoplasmic reticulum