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Flashcards in Session 4 Deck (14):
0

What is the significance of genome composition in viruses?

- RNA viruses are more likely to mutate as RNA a is less stable

1

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

2

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

3

Give examples of DNA enveloped viruses

- Hepatitis B (inflamed liver)
- Herpes (oral/genital)
- Smallpox (smallpox)

4

Give an example of a DNA non-enveloped virus

- HPV (warts/cervical cancer)

5

Give examples of RNA enveloped viruses

- HIV (AIDS)
- Rubella (rash/congenital rubella syndrome)
- Rotavirus (diarrhoea)
- Coronavirus (SARS)

6

Give examples of RNA non-enveloped viruses

- Polio (Inflammation of spinal chord)
- Haepatitis B (liver disease)

7

What are different habitats occupied by microbes?

- Air
- Soil
- Bodily fluids
- Animals
- Plants
- Humans

8

Define reservoir

- Any person, animal, plant, soil, substance in which an infectious agent lives/multiplies

9

Define source

- Readily available form of infection agent

10

Define mode of transmission

- Ingestion
- Inhalation
- Physical contact
- Inoculation
- Sexual transmission

11

Define carriage

- Passage taken by microorganism eg nasal/throat

12

Define Normal flora

- Non-pathogenic bacteria naturally found in our bodies eg in the gut

13

Define Commensal

- Symbiotic relationship where one species derives benefit (microbes) and the other is unaffected (host)
- This is the time where the microbe may be replicating or waiting for the immune system to become compromised