Baltimore Virus Classification System

Questions and Answers

What are the classes of DNA viruses in the Baltimore classification system?

I, II, VII (correct)

III, IV, V, VI

I, III, V

II, IV, VI

What type of virus is associated with Class I?

Herpesviruses

What type of virus is associated with Class II?

Parvoviruses

What type of virus is associated with Class VII?

Hepadnaviruses Signup and view all the answers

What are the classes of RNA viruses in the Baltimore classification system?

III, IV, V, VI Signup and view all the answers

What type of virus is associated with Class III?

Reoviruses Signup and view all the answers

What type of virus is associated with Class IV?

Picornaviruses Signup and view all the answers

What type of virus is associated with Class V?

Orthomyxoviruses Signup and view all the answers

What type of virus is associated with Class VI?

Retroviruses Signup and view all the answers

What is the Baltimore Classification System?

Viral classification system that classifies viruses by the type of genome they have and how they replicate it Signup and view all the answers

Study Notes

Baltimore Virus Classification System

Categorizes viruses based on their genome type and replication method.

DNA Viruses

Classified into groups I, II, and VII.

Class I

Herpesviruses: Double-stranded DNA (dsDNA) virus.
Uses the minus strand for mRNA production, which is essential for viral protein translation.
Genome replication follows classical semiconservative model.

Class II

Parvoviruses: Single-stranded DNA (ssDNA) virus.
Synthesizes a complementary strand to form a dsDNA intermediate.
The minus strand is transcribed to produce mRNA for viral protein synthesis.
Genome replication also follows the classical semiconservative method with the negative strand being discarded.

Class VII

Hepadnaviruses: Double-stranded DNA (dsDNA) virus.
Transcription of the minus strand creates mRNA for translation into proteins.
Genome replication involves a unique process of transcription followed by reverse transcription.

RNA Viruses

Classified into groups III, IV, V, and VI.

Class III

Reoviruses: Double-stranded RNA (dsRNA) virus.
The minus strand is transcribed to form mRNA (+) for protein production.
Genome replication creates single-stranded RNA (ssRNA) (+) and its complementary partner, ssRNA (-).

Class IV

Picornaviruses: Single-stranded RNA (ssRNA) virus.
The viral RNA functions directly as mRNA (+) for protein synthesis.
Genome replication produces ssRNA (-), which is then transcribed back to create more ssRNA (+), resulting in a tenfold increase.

Class V

Orthomyxoviruses: Single-stranded RNA (ssRNA -) virus.
Transcription of the minus strand generates mRNA (+) for protein translation.
Genome replication involves the synthesis of ssRNA (+) and transcribing it into the ssRNA (-) genomic form.

Class VI

Retroviruses: Single-stranded RNA (ssRNA +) virus.
Utilizes reverse transcriptase to synthesize a dsDNA intermediate, which produces mRNA (+) by transcription.
Genome replication entails converting the negative strand of dsDNA into ssRNA (+) genome through transcription.

Key Features of the Baltimore Classification System

Distinguishes viruses primarily by their genetic make-up (DNA/RNA) and replication strategies.

Description

This quiz explores the Baltimore Virus Classification System, focusing on the different classes of viruses based on their genome type and replication methods. Learn about Class I, II, and VII viruses including Herpesviruses, Parvoviruses, and Hepadnaviruses, and their unique characteristics. Test your knowledge on viral DNA structure and replication processes.