Question

1. the baltimore classification system groups viruses based on: a) their method of transmission b) their shape and size c) their genetic material and replication method d) their ability to infect bacteria 9) which of the following pairs is correct? a) influenza - dna virus b) hiv - dna virus c) herpes simplex - rna virus d) hepatitis b - dna virus 10) what is the difference between biological and mechanical vectors? a) biological vectors actively participate in a pathogen’s life cycle, while mechanical vectors only transport pathogens b) mechanical vectors spread disease through biting, while biological vectors do not c) biological vectors can only carry viral diseases, while mechanical vectors carry bacterial infections d) there is no difference between biological and mechanical vectors 11) which of the following is a major vector of human diseases? a) earthworms b) houseflies c) mosquitoes d) spiders

Explanation:

1. The Baltimore classification system groups viruses according to their genetic material (DNA or RNA) and their replication method.
2. Influenza is an RNA - virus, HIV is an RNA - virus, Herpes simplex is a DNA - virus, and Hepatitis B is a DNA - virus.
3. Biological vectors actively participate in a pathogen's life - cycle (e.g., mosquitoes for malaria where the parasite develops inside the mosquito), while mechanical vectors only transport pathogens (e.g., houseflies carrying bacteria on their legs).
4. Mosquitoes are major vectors of human diseases such as malaria, dengue, Zika etc.

Answer:

1. C. Their genetic material and replication method
2. D. Hepatitis B - DNA virus
3. A. Biological vectors actively participate in a pathogen’s life cycle, while mechanical vectors only transport pathogens
4. C. Mosquitoes