16 Questions
What is the membrane-bound organelle where eucaryotic cells have two or more chromosomes?
Nucleus
What is the purpose of exposing crystals of purified bacterial ribosomes to X rays?
To analyze the resulting diffraction pattern
Which proteins are involved in looping and coiling bacterial DNA within the nucleoid?
Condensins
In what phylum are membrane-bound DNA-containing regions present as exceptions to the norm of bacterial DNA packaging?
Planctomycetes
What distinguishes bacterial DNA packaging from that of eukaryotes and some archaea?
Absence of histone proteins
What is the unique feature of the nuclear body of Gemmata obscuriglobus among bacteria?
Bounded by two membranes
What are plasmids in prokaryotes?
Extrachromosomal DNA molecules
How many genes do plasmids generally contain?
Less than 30 genes
What is the role of plasmids in host cells?
Not important for cell function
How do single-copy plasmids differ from multicopy plasmids?
Multicopy plasmids produce only one copy per cell
Which type of replication do plasmids undergo?
Autonomous replication
What is the term used to describe plasmids that are able to integrate into the chromosome and are replicated with it?
Episomes
What is the term for the loss of a plasmid, which can occur spontaneously or be induced by specific treatments?
Curing
Which type of plasmids are important in spreading antibiotic resistance among bacteria?
Conjugative plasmids
What do bacteriocin-encoding plasmids provide to the bacteria that harbor them?
Competitive advantage
Which plasmids carry genes for factors that make their hosts more pathogenic?
Virulence plasmids
Explore the differences in genetic material packaging between procaryotic and eucaryotic cells. Learn about the presence of membrane-bound organelles like the nucleus in eucaryotes and the location of the chromosome in a nucleoid in procaryotes.
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