Bacteria, Viruses, Cells: Differences & Characteristics

[sueanne]

pls if anyone can answer the following, ill be so grateful...

- do bacterial cells and plant cells have chromosones, glycogen and cellulose??
- why is a virus not considered to be a cell??
- wots the difference between the appearance of yeast, bread mould and the field mushroom?
( is it because yeast is edible, while we can't eat bread mould cos it poisonous)

 

[iansmith]

- do bacterial cells and plant cells have chromosones, glycogen and cellulose??

Chromsome are present in every organism carrying DNA. For most bacteria the there is only 1 chromosome and it is a circle; however several exception exist. Plants also have chromsome and tend to have more chromosome than animals.

For glycongen, only certain type of animals will use glycogen as energy storage. It is not use by bacteria and plant as a energy storage.

For cellulose, both bacteria (for example cyanobacteria) and plant produce cellulose. Urochordates are the only animals that produce cellulose.

- why is a virus not considered to be a cell??

Because it does not have the basic component of what is consider a cell. Viruse are only a protein coat with or without lipid membrane and a chromosome. A cell needs material that will enable it to self-replicate to a certain extent.

- wots the difference between the appearance of yeast, bread mould and the field mushroom?
( is it because yeast is edible, while we can't eat bread mould cos it poisonous)

This might give you a clue to what they want. If you look in a microscope and look at the colony of the organism what are the difference.

Budding yeast
Cells
http://wwwuser.gwdg.de/~molmibio/images/yeastnew.jpg
Colony http://biology.clc.uc.edu/fankhauser/Labs/Microbiology/Yeast_Plate_Count/08_yeast_colonies_P7201186.jpg

Bread Mold
Cells
http://www.sciencenmore.com/brmold.jpg
Colony
http://food.oregonstate.edu/images/safety/bread_mold.jpg

 

[sueanne]

thanks a lot !