Question

Given below is the diagram of a bacteriophage. In which one of the options all the four parts a, b, c, and d are correct?

• A. (a)-Collar,(b)-Tail fibres,(c)-Head,(d)-Sheath
• B. (a)-Tail fibres,(b)-Head,(c)-Sheath,(d)-Collar
• C. (a)-Sheath,(b)-Collar,(c)-Head,(d)-Tail fibres
• D. (a)-Head,(b)-Sheath,(c)-Collar,(d)-Tail fibres

Answer 1

The correct option is D

(a)-Head,(b)-Sheath,(c)-Collar,(d)-Tail fibres

Bacteriophages are viruses which infect bacteria. The structure of a typical bacteriophage includes a head and a tail. The geometrically shaped head or capsid contains protein, and stores the genetic material. From the capsid, runs the tail, which is a hollow tube that serves as a passageway for the genetic material to pass from the capsid to the host bacteria. The entire tail is covered with a sheath. Tail fibers present at the bottom of the tail are used to securely attach the bacteriophage to the bacterial surface. These fibers contract during an infection.