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Helical contractile sheath occurs in
Helical contractile sheath occurs in
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The correct option is B Bacteriophage
A bacteriophage is a type of virus that infects bacteria. Bacteriophage is composed of genetic material which is packed in icosahedral head with tail. Bacteriophage tail consists of a contractile sheath, a tube and a baseplate. The central cylindrical segment of the tail consists of a rigid tube surrounded by the outer contractile sheath assembled from gp18 subunits. A total of 138 copies of gp18 arranged into 23 hexameric rings and constitutes the contractile sheath. During infection, contraction of the sheath drives the central tube through the host outer membrane which creates a channel for DNA ejection from the capsid into the host cell. So the correct answer is 'bacteriophage'.
A bacteriophage is a type of virus that infects bacteria. Bacteriophage is composed of genetic material which is packed in icosahedral head with tail. Bacteriophage tail consists of a contractile sheath, a tube and a baseplate. The central cylindrical segment of the tail consists of a rigid tube surrounded by the outer contractile sheath assembled from gp18 subunits. A total of 138 copies of gp18 arranged into 23 hexameric rings and constitutes the contractile sheath. During infection, contraction of the sheath drives the central tube through the host outer membrane which creates a channel for DNA ejection from the capsid into the host cell. So the correct answer is 'bacteriophage'.
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