AS and A Level Biology 2 Views 1 Answers
Outline how viruses are classified, limited to the type of nucleic acid (RNA or DNA) and whether this is single stranded or double stranded
Outline how viruses are classified, limited to the type of nucleic acid (RNA or DNA) and whether this is single stranded or double stranded
Answer
Viruses are classified based on the type of nucleic acid they contain and whether this nucleic acid is single-stranded or double-stranded. The primary categories are as follows:
Classification Based on Nucleic Acid Type
- DNA Viruses
- Single-Stranded DNA (ssDNA): These viruses have a single strand of DNA as their genetic material. Examples include Parvoviruses.
- Double-Stranded DNA (dsDNA): These viruses contain two strands of DNA. Examples include Adenoviruses and Herpesviruses.
- RNA Viruses
- Single-Stranded RNA (ssRNA): These viruses have a single strand of RNA. They can be further divided into:
- Positive-Sense ssRNA: This type can be directly translated into proteins by the host cell’s ribosomes. Examples include Poliovirus and Hepatitis A.
- Negative-Sense ssRNA: This type must first be transcribed into a positive-sense RNA before it can be translated. Examples include Rabies virus and Influenza virus.
- Double-Stranded RNA (dsRNA): These viruses have two strands of RNA. An example is the Reovirus.
- Single-Stranded RNA (ssRNA): These viruses have a single strand of RNA. They can be further divided into:
This classification system helps in understanding the replication strategies and biological behavior of different viruses, facilitating further research and treatment development.
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