Q.1
The genome of TMV codes for coat protein subunits consisting of
- Tobacco Mosaic Virus (TMV) Coat Protein (CP):
- Capsid Structure: TMV is a rigid, rod-shaped virion measuring $300\text{ nm} \times 18\text{ nm}$ containing a single-stranded positive-sense RNA genome of approximately 6,400 nucleotides.
- Coat Protein Subunit Length: The helical capsid is composed of exactly 2,130 identical coat protein subunits arranged in a right-handed helix. Each individual coat protein monomer consists of a polypeptide chain of exactly 158 amino acids with a molecular mass of $\sim 17.5\text{ kDa}$.
- Conclusion: TMV coat protein consists of 158 amino acids (Option 2).
Correct option: (2) 158 amino acids
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