Question

Select incorrect statement w.r.t. $T_4$bacteriophages :

• A. Have polygonal prismatic head
• B. Contractile tail without tail-sheath
• C. Six tail fibres
• D. ds-DNA as the genetic material

Answer 1

The correct option is B Contractile tail without tail-sheath


The bacteriophage have polygonal prismatic head with six tail fibres and the genetic material is dsDNA. The contractile tail of bacteriophage $T_4$ is a molecular machine that facilitates very high viral infection efficiency.

Its major component is a tail sheath, which contracts during infection to less than half of its initial length.