Flashcards in Session 4 Deck (14):
What is the significance of genome composition in viruses?
- RNA viruses are more likely to mutate as RNA a is less stable
What is the significance of an envelope in viruses?
- Viruses with envelopes are more easily sterilised as they cannot survive if the envelope has holes
What is the significance of the replication strategy of viruses?
- RNA viruses use reverse transcriptase (eg HIV)
- DNA viruses use host cell machinery (eg HPV)
- Viruses can carry their own replication enzymes
Give examples of DNA enveloped viruses
- Hepatitis B (inflamed liver)
- Herpes (oral/genital)
- Smallpox (smallpox)
Give an example of a DNA non-enveloped virus
- HPV (warts/cervical cancer)
Give examples of RNA enveloped viruses
- HIV (AIDS)
- Rubella (rash/congenital rubella syndrome)
- Rotavirus (diarrhoea)
- Coronavirus (SARS)
Give examples of RNA non-enveloped viruses
- Polio (Inflammation of spinal chord)
- Haepatitis B (liver disease)
What are different habitats occupied by microbes?
- Bodily fluids
- Any person, animal, plant, soil, substance in which an infectious agent lives/multiplies
- Readily available form of infection agent
Define mode of transmission
- Physical contact
- Sexual transmission
- Passage taken by microorganism eg nasal/throat
Define Normal flora
- Non-pathogenic bacteria naturally found in our bodies eg in the gut