Answer:
Please find the explanation below
Explanation:
The lac operon is a unit containing structural genes and a single promoter in bacteria such as E.coli. A repressed gene is a gene in which the expression has been inhibited or prevented from occuring.
In E.coli, the lac operon contains three structural genes viz: lacZ, lacY and lacA, that codes for proteins capable of degrading lactose sugar for energy purposes. In the presence of lactose, the expression (transcription and translation) of these three lac genes occur normally.
However, in a scenario where lactose is absent in the bacterial cell, the expression of the lac gene in the lac operon is inhibited. This inhibition/repression is done by LAC REPRESSOR, which is a transcription factor/protein that binds to the OPERATOR region of the lac operon and prevents RNA polymerase (transcription enzyme) from binding to the PROMOTER region.
Once RNA polymerase is prevented from binding to the promoter, transcription (gene expression) does not occur. Hence, in the absence of lactose sugar, the lac operon is a repressed gene.
Answer:
Their genes are expressed differently.
Explanation:
Nerve cells and skin cells have the same genes, but the reason they're different is because of how those genes are expressed and used. Some genes may not be of importance of skin, but they might have an affect on the neural pathways.
Answer:
Explanation:
The relation between individual and society is very close. Essentially, “society” is the regularities, customs and ground rules of anti human behavior. These practices are tremendously important to know how humans act and interact with each other. Society does not exist independently without individual.
Answer:
This order is determined by the attraction between a codon, a sequence of three nucleotides on the mRNA, and a complementary nucleotide triplet on the tRNA called an anticodon.
Explanation:
Hope this helps!! Didn't see what the choices were so I couldn't tell you that part. Just hope what I gave you will do you well!
Answer:pre-formed structures and chemicals, and by infection-induced responses of the immune system.
Explanation: brainliest?