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Why doesn't bacteria have their DNA encased in a nuclear envelope?
They are prokaryotes so did not evolve in the same way as eukaryotes. Bacteria are "simpler" organisms but have a highly complicated structure of their own
What Single celled organtism that can cause disease?
All the bacteria are the single celled organisms which do not have nuclear membrane and nucleus like eukaryotes.
What is a primitive cell with nuclear materials not enclosed by the nuclear membrane?
Eukaryotes are primitive cell with nuclear materials not enclosed by the nuclear membrane. Eukaryotes are formed by a single circular molecule of DNA.
Which observation supports the position of eukaryotes at the convergence of the ring of life?
The presence of shared genes and biochemical pathways among eukaryotes, archaea, and bacteria supports the idea of eukaryotes at the convergence of the ring of life. Additionally, the endosymbiotic theory, which proposes that eukaryotic organelles like mitochondria and chloroplasts were once free-living prokaryotes, is also evidence for this positioning. Lastly, genetic analyses have shown that eukaryotes share genetic similarities with both archaea and bacteria, further suggesting their position at the center of evolutionary relationships.
What is the function of the nuclear membrance?
it helps in selective transport of molecules between nucleus and cytoplasm
What are some common traits of bacteria and archaea?
There are two traits that archaeans and bacteria share. These are the presence of a plasma membrane and the lack of a nuclear envelope.
Does fungi cell have nuclear material?
Yes. Fungi are eukaryotes.
What is a cell with a nuclear membrane?
Any cell with a nucleus will have a nuclear membrane. The nuclear membrane is just the outside of the nucleus - like the rubber on the outside of a rubber ball - that keeps your DNA in one place. Eukaryotes have nuclei, and therefore also have nuclear membranes. Prokaryotes (such as bacteria) do not have nuclei, and therefore don't have nuclear membranes. Their DNA floats free in the cell.
Why animal and plant cells cannot be classified as prokaryote?
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.
Does salmonella have organelles?
No. Escherichia coli (E. coli) is a bacterial species. Bacteria differ from eukaryotes (such as animals, plants, and fungi) in that the chromosome is not surrounded by a membrane. In eukaryotes the nuclear membrane surrounds the DNA thus creating a compartment in the cell known as the nucleus.
What are the two major groups of microorganisms based on whether or not the nuclear material is encased in a membrane?
Microorganisms are primarily categorized into two major groups based on the presence or absence of a membrane around their nuclear material: prokaryotes and eukaryotes. Prokaryotes, which include bacteria and archaea, lack a membrane-bound nucleus, while eukaryotes, such as fungi, protozoa, and algae, have a defined nucleus encased in a nuclear membrane. This distinction is fundamental to understanding the complexity and organization of different microbial life forms.
Can you distinguish the prokaryotic organisms from the eukaryotic organisms?
Yes. The prokaryotes are much smaller and have no organelles. They have an area in the cell that their DNA is found but there is no nuclear membrane around it. The opposite is true to eukaryotes. Bacteria are an example of prokaryotes and human cells are eukaryotic.
