It is a circular chromosome plus plasmids.
Bacterial DNA in Human Genomes. A new study finds strong evidence that bacteria can transfer genes into human genomes, especially in cancer cells. By Ed Yong | June 20, 2013. Pseudomonas, one of the bacteria groups that have transferred genes to human Bacterial DNA – a circular chromosome plus plasmids. The DNA of most bacteria is contained in a single circular molecule, called the bacterial chromosome. The chromosome, along with several proteins and RNA molecules, forms an irregularly shaped structure called the nucleoid. This sits in the cytoplasm of the bacterial cell. In addition to the chromosome, bacteria often contain plasmids – small circular DNA molecules. Bacteria can pick up new plasmids from other bacterial cells (during conjugation) or from the environment. · just now. Report Abuse. bacteria's DNA floats freely through out its cytoplasm because bacteria are prokaryotic which means they are a type of cell that has no membrane bound organelles so no nucleus. this is unlike eukaryotic cells (plant and animals cells) in which the DNA is located inside the nucleus. Source(s): my bio class. What are the basic properties of the genomes of bacteria? Most bacteria have a genome that consists of a single DNA molecule (i.e., one chromosome) that is several million base pairs in size and is circular (doesn't have ends like chromosomes of eukaryotic organisms).  1 Scientists can force bacteria to keep them. 2  Virtually all plasmids that are used to deliver DNA contain genes for antibiotic resistance. 3  Once bacteria have been treated with a plasmid, scientists grow them in the presence of antibiotic. 4  Only those cells that contain the plasmid will survive, grow and reproduce. This sits in the cytoplasm of the bacterial cell. In addition to the chromosome, bacteria often contain plasmids – small circular DNA molecules. Bacteria can pick up new plasmids from other bacterial cells (during conjugation) or from the environment. Best Answer: Bacteria, as mentioned in the previous answers, have no nucleus, so the DNA is located in the cytoplasm. However, the bacterial chromosome tends to be tethered to the plasma membrane. This area of the cytoplasm containing the chromosome is referred to as the nucleoid. Report Abuse. bacteria's DNA floats freely through out its cytoplasm because bacteria are prokaryotic which means they are a type of cell that has no membrane bound organelles so no nucleus. this is unlike eukaryotic cells (plant and animals cells) in which the DNA is located inside the nucleus. Source(s): my bio class. In 2000, scientists claimed to have “resurrected” bacteria, named Lazarus bacteria, discovered in a salt crystal conventionally dated at 250 million years old. They were shocked that the bacteria’s DNA was very similar to modern bacterial DNA.  This plasmid can be introduced into a bacterium by way of the process called transformation. Then, because bacteria divide rapidly, they can be used as factories to copy DNA fragments in large quantities. A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. Plasmids naturally exist in bacterial cells, and they also occur in some eukaryotes. Often, the genes carried in plasmids provide bacteria with genetic advantages, such as antibiotic resistance. Plasmids have a wide range of lengths, from roughly one thousand DNA base pairs to hundreds of thousands of base pairs Eukaryotic DNA is packaged into chromosomes. Chromosomes are single strands of DNA. Bacterial DNA is packaged into a single chromosome that is a continuous loop. In both cases, the DNA must be folded or coiled so that it will fit into the cell. In bacteria the compaction involves DNA binding proteins that help to form initial loops followed by coiling of DNA. DNA Replication in Bacteria. In general, DNA is replicated by uncoiling of the helix, strand separation by breaking of the hydrogen bonds between the complementary strands, and synthesis of two new strands by complementary base pairing. 7) . In bacteria, Par proteins function to separate bacterial chromosomes to opposite poles of the cell during cell division. They bind to the origin of replication of the DNA and physically pull or push the chromosomes apart, similar to the mitotic apparatus of eukaryotic cells.
http://www.the-scientist.com/?articles.view/articleNo/36108/title/Bacterial-DNA-in-Human-Genomes/ http://biotechlearn.org.nz/themes/bacteria_in_biotech/bacterial_dna_the_role_of_plasmids https://answers.yahoo.com/question/index?qid=20090406200358AAeO5Hf http://www.lehigh.edu/~jas0/G16.html http://biotechlearn.org.nz/themes/bacteria_in_biotech/bacterial_dna_the_role_of_plasmids https://answers.yahoo.com/question/index?qid=20090406200358AAeO5Hf https://answersingenesis.org/natural-selection/antibiotic-resistance/10-dna-in-ancient-bacteria/ http://www.nature.com/scitable/definition/plasmid-plasmids-28 http://highered.mheducation.com/sites/9834092339/student_view0/chapter4/bacterial_chromosome_compaction.html http://faculty.ccbcmd.edu/~gkaiser/SoftChalk%20BIOL%20230/Prokaryotic%20Cell%20Anatomy/nucleoid/nucleoid/nucleoid3.html
dna in bacteria