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Given below is the diagram of a bacteriophage. In which one of the options are all the four parts A, B, C and D correct?
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A
A – Tail fibres, B – Head, C – Sheath, D – Collar
B
A – Sheath, B – Collar, C – Head, D – Tail fibres
C
A – Head, B – Sheath, C – Collar, D – Tail fibres
D
A – Collar, B – Tail fibres, C – Head, D – Sheath
Detailed Solution
A bacteriophage (e.g., T-even phage) has a polyhedral head, a short collar, a tail with a contractile sheath, a basal plate and tail fibres.
A is the polyhedral structure at the top that encloses the nucleic acid (DNA): the head.
C is the narrow ring-like region just below the head, joining it to the tail: the collar.
B is the long cylindrical, contractile covering of the tail: the sheath.
D is the set of long thread-like leg structures arising from the base plate, with which the phage attaches to the bacterium: the tail fibres.
Hence A – head, B – sheath, C – collar, D – tail fibres.
A is the polyhedral structure at the top that encloses the nucleic acid (DNA): the head.
C is the narrow ring-like region just below the head, joining it to the tail: the collar.
B is the long cylindrical, contractile covering of the tail: the sheath.
D is the set of long thread-like leg structures arising from the base plate, with which the phage attaches to the bacterium: the tail fibres.
Hence A – head, B – sheath, C – collar, D – tail fibres.