Viruses are actually not cells at all they are parasites which have a non-cellular structure which is composed mainly of nucleic acid. Viruses lack ribosomes therefore they must use ribosomes from their host cells to interject RNA into viral proteins. All viruses can either contain DNA or RNA but they cannot have both.

Viruses are actually not cells at all they are parasites which have a non-cellular structure which is composed mainly of nucleic acid. Viruses lack ribosomes therefore they must use ribosomes from their host cells to interject RNA into viral proteins. All viruses can either contain DNA or RNA but they cannot have both. When living outside the cell a virus is known as a virion. Virions have at least one protein that is synthesized by specific genes in the nucleic acid.

Reference:

http://micro.magnet.fsu.edu/cells/virus.html

Answer the following no later than Saturday using no fewer than 250 words:

Select at least two cell structures and describe their structure and function. What hypothesis could you form to explain what would happen to the cell or the organism if either cell structure were damaged or destroyed?

Nucleus- This is the “brain” of the cell. The nucleus is where DNA is kept or RNA is transcribed. RNA would be transported out of the nucleus through nuclear pores. There are also proteins that are needed which are transported through the nuclear pores. The nucleolus would be visible as a dark spot and is where ribosomes are formed. I would have to hypothesis that if the nucleus were damaged or destroyed the cell would die mainly because there would be no brain and that would result in no direction given on how to function properly, the genetic material would no longer be produced which would result in the cell dying.

Ribosomes- These are where the proteins synthesis, or where RNA is translated into protein. The translation of protein is extremely important for cells. There are large numbers ranging into the hundreds of thousandsof ribosomes found throughout cells. The ribosomes float freely in cytoplasm and can be bound to the endoplasmic reticulum also known as ER. Ribosomes that are bound to the endoplasmic reticulum (ER) are known as rough endoplasmic reticulum because when viewed they appear as black dots on the endoplasmic reticulum (ER) giving it a rough texture. Ribosomes are very small and are made up of fifty proteins and several long RNA’s which are intricately bound together, they have no membrane. I would have to hypothesis that if the ribosomes were damaged or destroyed the cell would be at risk because proteins would no longer be produced which is what makes up the immune system.

Reference:

http://mvc.bioweb.dcccd.edu/weblinks/organelles.html

 

How can prokanyotic cells live without a nucleus?

I am not 100% on this but I believe they can live without a nucleus because they have a plasmid which is an extra chromosomal DNA which is separated from the chromosomal DNA that can replicate itself independently.