AP BIOLOGY

Detailed explanation-1: -Viral Structure. In the simpler viruses the virion consists of a single molecule of nucleic acid surrounded by a protein coat, the capsid; the capsid and its enclosed nucleic acid together constitute the nucleocapsid. In some of the more complex viruses the capsid surrounds a protein core (Fig.

Detailed explanation-2: -(A) Virus capsids are composed of viral protein subunits that form structural units.

Detailed explanation-3: -Capsid-Nucleic acid is enclosed in a shell of proteins called a capsid. Proteins are arranged in subunits known as capsomeres and then tightly integrated within nucleic acid giving it a shape of polygon-like sphere or a helix.

Detailed explanation-4: -A virus is made up of genetic code surrounded by a protein coat. They are the most common biological entities on Earth, outnumbering bacteria 10 to 1.

Detailed explanation-5: -Viruses consist of a nucleic-acid core surrounded by a protein capsid with or without an outer lipid envelope. Viral replication within a living cell always produces changes in the cell, sometimes resulting in cell death and sometimes slowly killing the infected cells.