The first true cells were prokaryotic cells. These were the first living organisms and were simple life-forms that didn't have a nucleus.
Organisms that lack a nucleus is called a Prokaryote. All prokaryotic cells are bacteria. :)
A prokaryote cell doesn't have a true nucleus. See: http://wiki.biomine.skelleftea.se/wiki/index.php/Prokaryote_versus_eukaryote for an explanation of the differences between eukaryotes, cells with a true nucleus, and prokaryotes.
Prokaryote : bacteria, also red blood cells (not true cells but dieing remnants).
Mammalian red blood cells have no nucleus. Bird and reptile red blood cells DO have a nucleusProkaryotes - bacterial cells (eubacteria and archaebacteria).
false reproductive cells (also called germ cells) are egg & sperm when these reproductive cells fuse together, the zygote is formed
protocells
Organisms that lack a nucleus is called a Prokaryote. All prokaryotic cells are bacteria. :)
A prokaryote.
A cell.
Prokaryote means that it contains no true nucleus, which is a nucleus bound with nuclear envelope. Animal cells and plant cells do have a nucleus which is bound with nuclear envelope. For this reason, they are called eukaryote, meaning true nucleus.
Prokaryote : bacteria, also red blood cells (not true cells but dieing remnants).
true...
Bacteria is a Prokaryote, a simple cell with no true nucleus. Animal and Plant cells are considered Eukaryotic, cells with a true nucleus.
Prokaryote : bacteria, also red blood cells (not true cells but dieing remnants).
The biggest difference between a prokaryote and a eukaryote is the presence of a true-nucleus. Prokaryote does not contain a membrane-bound nucleus and has its DNA suspended in nucleoid region. Eukaryotes do have its nucleus surrounded by a nuclear membrane.
The blood cells of mammals and cordates are not true cells they are formed from other cells... so they are called formed elemements...
A prokaryote cell doesn't have a true nucleus. See: http://wiki.biomine.skelleftea.se/wiki/index.php/Prokaryote_versus_eukaryote for an explanation of the differences between eukaryotes, cells with a true nucleus, and prokaryotes.