NEET BIOLOGY

Detailed explanation-1: -Viral capsids can be found in shapes, such as helical, polygonal, and sphere. Helical-shaped capsids are named because of the spiral shape of the capsid, but the shape of the nucleic acid and the protein subunits called capsomeres are in rod or filament shapes.

Detailed explanation-2: -Virus capsids predominantly come in two shapes: helical and icosahedral. The helix (plural: helices) is a spiral shape that curves cylindrically around an axis. It is also a common biological structure: many proteins have sections that have a helical shape, and DNA is a double-helix of nucleotides.

Detailed explanation-3: -In general, the shapes of viruses are classified into four groups: filamentous, isometric (or icosahedral), enveloped, and head and tail. Filamentous viruses are long and cylindrical.

Detailed explanation-4: -Viruses may also be classified according to the structure of the virus particle, or virion. The three major shapes seen are spherical, filamentous, and complex.