Study the given figure of structure of TMV (Tobacco Mosaic...

Study the given figure of structure of TMV (Tobacco Mosaic Virus) and select the option that correctly identifies the labellings $\mathrm{A}$ and $\mathrm{B}$.
A $\quad$ B
(a) SSDNA Capsomeres.
(b) dsDNA Capsomeres
(c) SSRNA Capsomeres
(d) dsRNA $\quad$ Tail fibres

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Key Concepts

Viral Genome

The viral genome consists of the nucleic acid (DNA or RNA) that carries the genetic information necessary for viral replication. The nature of the genetic material—whether it is single-stranded or double-stranded, and whether it is DNA or RNA—affects the virus’s replication strategy and its interactions with host cells.

Helical Symmetry

Helical symmetry is a common structural arrangement in viruses where the protein subunits (capsomeres) are arranged in a helical (spiral) fashion around a central genomic core. This organization is characteristic of many rod-shaped viruses and is crucial for the assembly and stability of the viral particle.

Virus Structure

Virus structure refers to the overall organization of a virus, which typically includes the genetic material (either DNA or RNA) and a protein shell called a capsid. Understanding the arrangement of these components is essential for studying how viruses interact with their host cells and how they replicate.

Capsomeres

Capsomeres are the protein subunits that come together to form the viral capsid. They play a key role in determining the symmetry and structural integrity of the virus, as well as in protecting the viral genome from the external environment.

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