AP BIOLOGY

Detailed explanation-1: -Capsids come in about three different shapes, although there can easily be more complex ones. The most common shapes are icosahedral, prolate, and helical.

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: -Viruses are classified into four groups based on shape: filamentous, isometric (or icosahedral), enveloped, and head and tail.

Detailed explanation-4: -Virus particles come in a wide range of sizes and shapes. 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.