Baltimore classification system

Definition

The Baltimore classification system categorizes viruses based on their type of genome and their method of replication. It includes seven classes, each defined by whether the viral genome is DNA or RNA, single-stranded or double-stranded, and how it replicates.

5 Must Know Facts For Your Next Test

1. There are seven classes in the Baltimore classification system.
2. Class I includes double-stranded DNA viruses like Herpesviruses.
3. Class IV contains positive-sense single-stranded RNA viruses such as the Poliovirus.
4. Reverse transcription is a key feature for Class VI and VII viruses, which include Retroviruses like HIV.
5. Each class represents a different approach to mRNA synthesis and replication.

Review Questions

• How many classes are there in the Baltimore classification system?
• Which class includes Retroviruses such as HIV?
• What is the main criterion for categorizing viruses in the Baltimore classification system?

Related terms

Genome:

The complete set of genetic material within an organism or virus.

Replication:

The process by which a virus makes copies of itself within a host cell.

Reverse Transcription:

A process wherein RNA is reverse-transcribed into DNA, characteristic of some viruses like Retroviruses.