IMMUNOLOGY

Detailed explanation-1: -They are surrounded by a protein coat – capsid and have a nucleic acid core comprising DNA or RNA.

Detailed explanation-2: -Viruses are classified on the basis of morphology, chemical composition, and mode of replication.

Detailed explanation-3: -Viruses can be classified on the basis of capsid shape, presence or absence of an envelope, and type of nucleic acid.

Detailed explanation-4: -Baltimore classification (first defined in 1971) is a classification system that places viruses into one of seven groups depending on a combination of their nucleic acid (DNA or RNA), strandedness (single-stranded or double-stranded), sense, and method of replication.

Detailed explanation-5: -Viral genomes exhibit extraordinary diversity with respect to nucleic acid type, size, complexity, and the information transfer pathways they follow. Thus, viral nucleic acids can be DNA or RNA, double-stranded or single-stranded, monopartite or multipartite, linear or circular, as short as 2 kb or up to 2500 kb long.

Detailed explanation-6: -Viruses contain nucleic acid as RNA or DNA. These molecules possess all the genetic information of the virus.

Detailed explanation-7: -Type of the nucleic acid including size of the genome, strandedness (single or double), linear or circular, positive or negative (sense), segments (number and size), sequence and G+C content etc. Symmetry of the protein shell. Presence or absence of a lipid membrane. More items