Bacterial Shape, Size & Structure Quiz

Q131. Which organisms produce colicins?
 A. Pseudomonas aeruginosa
 B. E. coli
 C. Salmonella
 D. Streptococcus pyogenes

Hint: Colicins are named after the bacteria that produce them.

Q132. Which enzyme allows transposons to move?
 A. Gyrase
 B. Helicase
 C. Transposase
 D. Ligase

Hint: Same enzyme that mediates transposon movement.

Q133. What is a feature of non-replicative transposition?
 A. No gene disruption
 B. Plasmid replication
 C. Cut and paste mechanism
 D. Permanent integration

Hint: This type of transposition excises and reinserts DNA.

Q134. Which feature distinguishes plasmids from transposons?

 A. Circular DNA
 B. Self-replication
 C. Contain transposase
 D. Cause mutations

Hint: Plasmids can independently replicate.

Q135. How are transposons different from bacteriophages?
 A. Can integrate into DNA
 B. Code for toxins
 C. Lack independent replication
 D. Circular genome

Hint: They need host DNA to replicate.

Q136. Transposons can affect gene expression by:
 A. Enhancing ATP production
 B. Causing gene duplications
 C. Mutating nearby genes
 D. Eliminating resistance genes

Hint: Their insertion can alter normal gene expression.

Q137. Capsules help bacteria adhere to:
 A. Other bacteria
 B. Human tissues
 C. Blood vessels
 D. Enzymes

Hint: Attachment is a key step in infection.

Q138. What genetic element cannot exist independently?
 A. Plasmid
 B. Virus
 C. Chromosome
 D. Transposon

Hint: It relies on integration into host DNA.

Q139. What identifies a capsule antigenically?
 A. Shape
 B. Protein
 C. Sugar composition
 D. Lipid membrane

Hint: These determine different serotypes.

✅ Answer Key:

Q131: E. coli         Q132: Transposase         Q133: Cut and paste mechanism         Q134: Self-replication         Q135: Lack independent replication         Q136: Mutating nearby genes         Q137: Human tissues         Q138: Transposon         Q139: Sugar composition