E. coli strains diploid for the lac region were constructed by introducing a plasmid carrying the lac genes. The plasmid carries one copy of the lac region, and the chromosome carries the other copy. The two copies of the lac region have different genotypes, as shown in the chart below. Indicate whether the products of the lacy gene (permease) and the lacZ gene (ß-galactosidase) will be inducible, uninducible, or constitutive in each strain (assuming glucose is absent). lac region on plasmid lac region on chromosome permease B-galactosidase I-o+Z+Y- I+o+ Z-Y+ I+o+Z+Y- I+o°Z=Y+ I- oº Z+Y- I+o+ Z-Y+ Is o+ Z+Y- I+o+ Z-Y+ I+ oc Z+Y- Is o+ Z-Y+
Bacterial Genomics
The study of the morphological, physiological, and evolutionary aspects of the bacterial genome is referred to as bacterial genomics. This subdisciplinary field aids in understanding how genes are assembled into genomes. Further, bacterial or microbial genomics has helped researchers in understanding the pathogenicity of bacteria and other microbes.
Transformation Experiment in Bacteria
In the discovery of genetic material, the experiment conducted by Frederick Griffith on Streptococcus pneumonia proved to be a stepping stone.
Plasmids and Vectors
The DNA molecule that exists in a circular shape and is smaller in size which is capable of its replication is called Plasmids. In other words, it is called extra-chromosomal plasmid DNA. Vectors are the molecule which is capable of carrying genetic material which can be transferred into another cell and further carry out replication and expression. Plasmids can act as vectors.
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