[Seany (OP)]

I understand that bacteria has a nucleus, whilst a virus doesn't.. But viruses still multiply themselves and seems to have a want to live. Surely that makes  them a living thing?

[Chemistry4me]

We were taught that all living things could do MRS.(C).GREN which stands for movement, respiration, sense, circulation (although that one is a bit dodgy), growth, reproduce, excrete, and nutrition (or something along those lines). I'm fairly sure that viruses can only carry out two of those functions, if my memory is correct. []

[Seany (OP)]

I do see your point.
Viruses

Move -- yes

Respire? -- (No. Viruses do not have the ability to respire on their own. They need to use the mitochondria of their host cells in order to use the process of respiration of the cell they have invaded. So, in other words,you could say that viruses "borrow" the respiratory ability of a cell, and that can be aerobic or anerobic, with or without oxygen.)

Sense -- no

Circulation -- no

Growth -- yes

Reproduce -- yes? multiplying in a way..

Excrete -- No idea..

Nutrition -- Surely they eat on something??

I'm still not sure whether MRS GREN has to agree for it to be living..! It's very vague!