classification and types of viruses that identify different diseases

1. BY AREEBA AQEEL
ROLL NO:05
BOTANY (4TH)
VIRUSES

2. VIRUSES
Definition :
“ Viruses are non cellular infectious particles consisting only of the viral genes
(RNA or DNA) enclosed in a proteinaceous coat and reproduces only in living cells”.
CLASSIFICATION OF VIRUSES
PHYLUM: VIRA
All viruses are belonged this phylum. It has two sub-phyla:
 Sub-phylum Deoxyvira.
 Sub-phylum Ribovira.
 Sub phylum Deoxyvira:
It includes viruses with DNA core. It has 3 classes.
 Deoxyhelica
 Deoxycubica
 Deoxybinala

3. CLASSES OF DEOXYVIRA
CLASS DEOXYHELICA:
 DNA virus with helical symmetry
 Order Chaetovirales
 Family Poxviridae
CLASS DEOXYCUBICA;
 DNA virus with cubical symmetry
 Order Haplovirales: without envelope, has 6 families
 Order Peplovirales: envelope virus, Family Herpesvirdae
CLASS DEOXYBINALA;
 DNA containing binal viruses
 Order Urovirates
 Family Phagoviriclae

4. continued
 Sub phylum Ribovira:
Viruses with RNA core. It has 2 classes.
 Ribohelica
 Ribocubica
CLASSES OF RIBOVIRA
CLASS RIBOHELICA:
 RNA virus with helical symmetry
 Order Rhabdovirales: without enveloped, has 6 families
 Order Sagorvirales: enveloped, has 3 families
CLASS RIBOCUBICA
 RNA with cubical symmetry
 Order Gymnovirales: without envelope, has 2 families
 Order Tagovirales: enveloped, has a single family

5. RETROVIRUS
ES
Definition:
“The RNA viruses which can
convert their single stranded RNA
into double stranded DNA “
 These viruses have special
enzyme called reverse
transcriptase.
 This enzyme is responsible for
the conversion of RNA into
DNA
TYPES OF
RETROVIRUSES
 RNA Tumor viruses:
• Also known as oncoviruses.
• Diameter 100nm.
• Spherical shaped.
• Enveloped by plasma
membrane of host.

6.  HIV VIRUS
• Human
immunodeficiency
virus
Cause:
• AIDS
• Affects helper T-
Lymphocytes
• HIV also infects CNS
Symptoms:
• Sudden weight loss
• Swollen lymph nodes
• General loss of
immunity