Are all plasmids of bacteria circular?

Plasmids are genetic units that can replicate autonomously outside the nucleus of eukaryotic cells or outside the nucleoid region of prokaryotes, including cyclic deoxyribonucleic acid (DNA) molecules in eukaryotic organelles (mainly mitochondria and chloroplasts) and outside the nucleoid region of bacterial cells"

I think that, according to the above paragraph, the plasmids of bacteria should all be circular.

And also. It's that not all bacteria have plasmids

Both. But I think this loop is like a rope that meets two ends, it's a loop, but if you crumple the rope that connects at these two ends, it's still called a loop, and it's not necessarily round.

Yes, because plasmids are defined as small circular DNA, of course they are circular.

There are also linear ones, which are available in biochemistry textbooks.

a.Extrachromosomal proteins.

b.Genetic material outside the nucleus of chromosomes.

c.Enzymes in the cytoplasm.

d.Inclusions in the cytoplasm of the socks.

e.Nutrient granules in the cytoplasm.

Correct Answer: Sue Brother B

a.Virulence celescent factor associated with the austogenic pathogenicity of bacteria.

b.Sexual pili encoding bacteria.

c.Transferable DNA that confers antimicrobial resistance in the bacterium schotan

d.Transportable DNA with viral genes

e.Transferable DNA in bacterial nucleus

Correct answer: c

It doesn't belong. Plasmids are not the basic structure of bacteria.

The basic structure of bacteria includes: cell wall, cell membrane, cytoplasm, and nucleoplasm. Special structures include: capsule, flagella, fimbrium, spores, plasmids, etc.

Plasmids are extrachromosomal genetic material that is double-stranded circular DNA. The molecular weight is smaller than that of chromosomes and can carry certain genetic information, such as antimicrobial resistance factors, bacteriocins, and sex pili, which are basically encoded on plasmids. Plasmids can replicate independentlyBacteria that have lost their plasmids can still survive normally

Plasmids can transfer traits to another bacterium through conjugation, transduction, etc.

There are two contents in the whole volume of the high school "Biology" (elective) of the People's Education Edition, one is that plasmids are often used in genetic engineering, and the other is that plasmids are contained in the structural cytoplasm of bacteria. Do other cells also have plasmids?

Is there only one plasmid? Here's a brief summary of what you know. 1What is a plasmid and what are the characteristics of plasmidsPlasmids are circular DNA molecules that are able to replicate very small outside the chromosomes of the cell.

Broadly speaking, almost all cells have plasmids (such as mitochondrial DNA), and in a narrow sense, plasmids are present in many organisms such as bacteria, yeasts, actinomycetes, etc. Plasmids are double-stranded DNA molecules like chromosomal DNA, and plasmids can also carry genetic information, and plasmids generally contain a few to hundreds of genes that control bacterial resistance, nitrogen fixation, antibiotic production and other traits. However, plasmids also have some properties that are different from chromosomal DNA.

1) The plasmid can independently replicate the plasmid as DNA, with the ability to replicate, the replication of the plasmid can not depend on chromosomes, but in the bacterial cytoplasm, plasmid replication must have the host cell to provide the enzymes and raw materials required for replication, this characteristic is very useful when the plasmid needs to be amplified in genetic engineering, and a large number of plasmids can be obtained. (2) The plasmid is very small, and the molecular weight of the bacterial plasmid is generally small, which is about that of bacterial DNA. The size of the bacterial plasmid is only about one percent of that of the nucleometric of ordinary bacteria.

a.Nucleoplasmic DNA

b.Cytosolic granules.

c.Nucleoproteosomes in the cytoplasm.

d.Nucleoplasm (or dyeing the chromobody) to envy the outer DNAEMedium dress up mediators.

Correct answer: d

Answer]: A plasmid is a DNA molecule other than chromosomes (or nucleoides) in organisms such as bacteria, Saccharomyces cerevisiae and Actinomycetes, which exist in the cytoplasm and have the ability to replicate autonomously, so that it can maintain a constant copy number in the daughter cells and express the genetic information it carries.