Not all bacteria (prokaryotic cells) are spore forming. So it is not a trait shared by all cells. The highly studied Escherichia coli is not spore forming, but the bacteria of the genus Bacillus are.

Spores are a special kind of bacterial offspring with a highly dehydrated and condensed content, and special cell walls produced in a special form of mitosis, that help bacteria to survive hostile environment. It is a resistant form of the cell, that given good condition will form new “normal cells” to start new bacterial colony.

HTH

Patrick

Some bacteria (a prokaryote) can form spores examples include Bacillus, Clostridium and Anthrax
http://www.microbe.org/microbes/spores.asp

Spores are a way that bacteria can survive in a dormant form for long periods of time.

Some spores can survive for years. Thats why the British govenment had to spend millions in the 1990s cleaning a scotish island after a WW2 germ warfare experiment left it covered in Anthrax spores.
http://news.bbc.co.uk/1/hi/scotland/1457035.stm

Yes and No.
Seeds are embryo, they have a different genetic material from the parent plant. Spores are just a highly resistant backup of the bacteria, genetically identical to its parent. But, they serve the same purpose: survival and dissemination of the genome.

Patrick

Do you mean centrosome?

For a quick overview over the centrosome you could read this:

http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=mboc4.section.2995

And for this kind of research a good free site is:

http://www.ncbi.nlm.nih.gov/entrez/

Search in “Books” for “whatever your looking at”. It even suggest some keywords in case of typo 🙄 After that you just have to select which book you want to see (try the more general first…) and here is your answer. Complete and up-to date.

HTH

Patrick

Bacterial spores are not like seeds. They are survival rather than reproductive structures.