Q.What is the shape of TMV? What is its genetic material?

TMV is rod-shaped (helical), and its genetic material is single-stranded RNA.

Tobacco Mosaic Virus (TMV) causes the mosaic disease of tobacco leaves and is one of the most studied viruses.

• Shape: TMV is a rod-shaped (helical/cylindrical) virus. Its capsid is made of many identical protein subunits (capsomeres) arranged helically around the nucleic acid. …

T4 bacteriophage has a complex (binal) structure with an icosahedral head and a helical contractile tail, and carries double-stranded DNA as its genetic material.

Shape:

T4 phage, which infects the bacterium Escherichia coli, shows a complex (binal) symmetry - it is neither purely icosahedral nor purely helical. It consists of:

• A polyhedral (icosahedral) head that encloses the genetic material.
• A helical tail consisting of a central hollow core, a contractile sheath, a base plate, and tail fibres that attach it to the specific receptors on the bacterial cell surface during infection. …