Cell unit of life, structure & diversity of animal/plant cells, viruses

Question 1

Viruses

Answer 1

Viruses are macromolecular packages that can function and reproduce only within living cells. (TMV first virus) (Can infect animals, plants & bacteria)

Question 2

Virion

Answer 2

Outside of host cells, a virus exists as an inanimate particle. Made of a small amount of DNA or RNA

Question 3

Host range

Answer 3

Viruses bind to cell surfaces via specific proteins and then enter into the cell

Question 4

Narrow host range

Answer 4

Human cold and influenza viruses infect epithelial cells of human respiratory system

Question 5

Wide host range

Answer 5

Like rabies can infect cells in dogs, foxes, bats, raccoons and humans

Question 6

Viral infection: Lytic

Answer 6

Production of virus particles ruptures and kills cells (e.g influenza, rabies)

Question 7

Viral Infection: Non-Lytic

Answer 7

Viral DNA is inserted in the host genome = PROVIRUS
Cell will be damaged but can survive, often with impaired function (e.g, HIV, Chicken Pox)