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} Viruses!!
Wednesday, January 27, 2010 @ 6:41 PM
Is a virus a living or a non-living thing?
We can determine whether an object is a living or a non-living thing by these eight characteristics:
Movement, Excretion, Respiration, Irritability, Growth, Reproduction, Adaptability and Nutrition. Most living things can fulfill all or most of the eight criteria.
So are viruses living or non-living??
What i found out was that:
A virus is a small infectious agent that can replicate only inside the cells of other organisms. Viruses can infect all types of organisms from animals to plants and even bacteria!!
When found outside of host cells, viruses exist as a protein coat or capsids, sometimes enclosed within a membrane.
Respiration- As they do not have their own metabolism, they cannot change food into chemical energy that the body can use and we all know that the process of changing food into chemical energy is respiration.
Nutrition- They do not have a need for food.
Reproduction- Viruses cannot reproduce by themselves. They must first attach themselves to the cell membrane and then inject a part of their DNA into the cells of the host organisms. As a result, they cannot reproduce normally without a host cell.
Growth- They cannot grow when alone. It must first inject its own DNA structure into the host organism's cell before new virus cells can grow.
Movement- Viruses are not motile, in other words, they cannot move on their own. They hitch rides in the body or anything that touches them.
Excretion- They do not produce their own waste.
From my views and research , i can conclude that viruses are non-living things!!
References:
http://library.thinkquest.org/CR0212089/virus.htm
http://en.wikipedia.org/wiki/Virus#Life_properties
Done by: Wei Xhan
When found outside of host cells, viruses exist as a protein coat or capsids, sometimes enclosed within a membrane.
Respiration- As they do not have their own metabolism, they cannot change food into chemical energy that the body can use and we all know that the process of changing food into chemical energy is respiration.
Nutrition- They do not have a need for food.
Reproduction- Viruses cannot reproduce by themselves. They must first attach themselves to the cell membrane and then inject a part of their DNA into the cells of the host organisms. As a result, they cannot reproduce normally without a host cell.
Growth- They cannot grow when alone. It must first inject its own DNA structure into the host organism's cell before new virus cells can grow.
Movement- Viruses are not motile, in other words, they cannot move on their own. They hitch rides in the body or anything that touches them.
Excretion- They do not produce their own waste.
From my views and research , i can conclude that viruses are non-living things!!
References:
http://library.thinkquest.org/CR0212089/virus.htm
http://en.wikipedia.org/wiki/Virus#Life_properties
Done by: Wei Xhan