viruses

Question 1

who discovered viruses

Answer 1

Beijerninck did an experiment on some tobacco plants which had the mosaic disease
Explained away as being a result of organisms which are smaller than bacteria

Question 2

size and shape

Answer 2

20-300 nanometres
Variable shape
Some are rod shaped others spherical

Question 3

why are viruses not considered cellular

Answer 3

No nucleus or cytoplasm so not considered cells and cannot follow grimner– nothing to respire

Question 4

describe process of viruses infecting someone

Answer 4

Wall made of protein where inside coiled up strand of nucleic acid
Can only reproduce inside cells of living organsm
One way they reproduce is by attaching itself to the surface of the cell
Then injects its strand of nucleic acid into the inside
Acid then multiplies into lots of separate strands
Round each strand a new virus is formed
Materials for making new viruses come from inside cell
Eventually cell bursts open killing it in the process and new viruses are set free

Question 5

how long does the process take

Answer 5

half an hour

Question 6

what are virus

Answer 6

All parasites where invade cell and use cell machinery to copy itself and reproduce

Question 7

what are the diseases

Answer 7

polio ebola