Viruses 2.0 Flashcards
how can viruses be classifyed
genome and by their mode of replication
Gentic material in DNA VIRUS?
DNA
What is a DNA virus
the viral DNA directs acts as a template for new virla DNA and for the mRNAs needed to create viral proteins
Gentic Material in RNA
RNA as the gentic material
What are the 2 types of RNA viruses that make the RNA virus
+ssRNA
-ssRNA
What is a -ssRNA virus
CANNOT BE DIRECTLY TRANSLATED
RNA strand must be transcribed before translated at the ribsomes
diseases that are caused by –ssRNA virus
Ebola
What is a +ssRNA virus
have RNA that can directly act as mRNA and be translated at the ribsomes
Diseas caused by +ssRNA virus
tobacco mosaic virus
What disease does DNA virus cause
lambda phage
Features of the retrovirus
Single strand of RNA
Reverse transcripatse enzyme produces cDNA from RNA template
Double stranded viral DNA intergrates into the host cells genome
Strucutre of a DNA virus?
Nucleic acid DNA which acts directly as a template for mRNA transcription/ DNA replication
Geometrical Shape
Compare and contrast the tobacco MV and ebola
Both are RNA viruses
TMV contains ssRNA virus which can be directly transated into proteins by ribosomes
Ebola contains -ssRNA which needs to be transcribed to produce mRNA before translation
Why are viruses classifed as non living
a celluar
No cytoplasm
cannot self replicated
Whats the role of glycoproteins
Used for attachemnt to CD4 receptors on t helper cell
