Question

Study the given figure of structure of TMV (Tobacco Mosaic Virus) and select the option that correctly identifies the labellings A and B.

• A.

  A	B
  ssDNA	Capsomeres

• B.

  A	B
  dsDNA	Sheathe

• C.

  A	B
  ssRNA	Capsomeres

• D.

  A	B
  dsRNA	Tail fibres

Answer 1

The correct option is C

A	B
ssRNA	Capsomeres

TMV is a simple rod-shaped helical virus consisting of centrally located single-stranded RNA (A) enveloped by a protein coat known as capsid. The capsid is made up of protein subunits known as capsomeres (B). The rod is considered to be 3,000 Å in length and about 180 Å in diameter. The protein coat is technically called 'capsid'.