Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
What is Prokaryotic Gene Expression ?
Control of prokaryotic gene expression occurs primarily at the level of transcription. Prokaryotic genes are arranged in units consisting of a regulator gene and associated units called operons. An operon consists of a promotor site, an operator site, and structural genes. The regulator gene, adjacent to the promotor and operator sites, produces repressors, protein molecules that bind to the operator site, preventing the attachment of RNA polymerase and the start of transcription of structural genes.
The concentration of certain enzymes, called inducible enzymes, is very much dependent upon the concentration of substrate in the cell. For example, in E. coli, the concentration of beta-galactosidase enzyme is very low in a lactose-free environment, but a large increase of the enzyme proportional to the lactose added to the growth medium is produced by a gene segment called the lac operon.
In high concentrations of lactose, inducer sugar molecules bind to the lac repressors and detach them from the operator, allowing RNA polymerase to bind and protein synthesis to occur. Two other proteins are produced along with beta-galactosidase - a permease and a transacetylase. The beta-galactosidase cleaves lactose into glucose and galactose; the permease facilitates transport of lactose across the bacterial cell membrane. The function of the transacetylase is not clear. When the lactose level decreases, repressors bind to the operator site and the operon becomes inactive.
Explain Materials for Root End Filling- Amalgam a) Its radiopacity is the better than any other REF materials b) Greatest amount of leakage! c) Corrosion, and significant
How sugar used in Flavors and Mouthfeel? In frozen desserts, sugars balance flavor and mouthfeel. Since low temperatures tend to numb the taste buds, sugars enhance flavors, th
History of Psychiatric Nursing: In 1873, Linda Richards, developed better nursing care in psychiatric hospitals, and organized nursing services and educational programmes in
PHYLUM CNIDARIA (= COELENTERATA ) Definition and Introduction Tissue grade eumetazoans with a radial symmetry .The term coelenterate signifies the presence
Define the term - Cholera Cholera is caused by the gram negative, V. cholerae, which is acquired by ingesting food or water contaminated by faecal material from patients or
You work with petunias and you have identified a single gene that causes their flowers to either be all pigmented (solid), or streaked with white. Depending on the genotype of this
Phosphorus deficiency Deficiency of phosphorus is usually primary and is widespread under natural conditions. It is characterized by pica, poor growth, infertility, and osteody
Q. What are some human diseases caused by bacteria and what are their respective modes of transmission? The major human bacterial infections transmitted by respiratory secretio
Clinical Neuropsychology Clinical neuropsychology is the application of neuropsychological knowledge to the assessment, management and rehabilitation of people who have suffere
Determine the types of blood There are three types of blood cells. They are Red Blood Corpuscles (RBC), White Blood Corpuscles (WBC) or leucocytes and blood platelets or thromb
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd