Question

4. Which of the following is a helical
virus?
(a) TMV
ООО
(b) T4 phage
(c) Poxvirus
O (d) Herpes virus​

Answer 1

Answer:

a) TMV

Explanation:

The well-studied tobacco mosaic virus (TMV) is an example of a helical virus, as seen in the Figure below. A helical virus, tobacco mosaic virus. Although their diameter may be very small, some helical viruses can be quite long.

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Answer 2

Answer:

(a) TMV (Tobacco Mosaic Virus)

Explanation:

• The arrangements of nucleocapsids in viruses divide viruses into two symmetries; helical and icosahedral. Helical symmetry is a symmetry in which protein subunits (capsomeres) and nucleic acid are arranged in the helix. In icosahedral symmetry, protein subunits are assembled into a symmetric shell that covers the nucleic acid-containing core.
• Tobacco Mosaic Virus (TMV) is the most commonly studied example of a virus with helical symmetry.
• TMV was discovered by Martinus Beijerinck as a causal agent of tobacco mosaic disease in tobacco plants. It has a rod-like appearance (18nm diameter) and contains a single-stranded RNA molecule as genetic material. Its RNA molecule contains 6395 nucleotides. The capsid of this virus is made up of 2130 capsomeres (coat protein molecules). It can easily cause chemical and genetic modifications. It has an application of being a viral vector for the transfer of gene of interest in plant cells in recombinant DNA technology. It has also some applications in nanotechnology and biomaterial devices.

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