Biology Help?

Question

Define an operon (what it is, where it is found), and tell me the
critical difference between the trp operon and the lac operon. How does
each one work? Why is the trp operon repressed when tryptophan is
present, while the lac operon is not repressed in the presence of
lactose?

Answer 1

I think you need to read your text book and/or lecture notes. I'm guessing that this is for a Genetics class? If so, your text book will have a very nice description of operons and their regulation. This is something you'll just have to come to understand.

Fundamentally, though, an operon is a group of genes that is coordinately expressed and regulated. The lac operon encodes proteins involved in the breakdown and catabolism of lactose, while the trp operon encodes enzymes in a biosynthetic pathway. Because of their different roles in metabolism, they are regulated differently.

Now, go to your book or notes and find the information you need to to answer these questions, and learn it.

Answer 2

operon-in genetics, site on a bacterial chromosome containing genes that control protein synthesis (structural genes) together with a gene that determines whether the structural genes are active or not (operator gene).

lac operon-The lac operon is an operon required for the transport and metabolism of lactose in Escherichia coli and some other enteric bacteria.

trp operon-Trp operon is an anabolic operon which promotes the production of tryptophan in the absence of tryptophan in the environment. This is regulated both by repression and by attenuation.

Hope it helps!

Answer 3

Ok what grade are you in?And you'll have to speak in english if you want an answer,i'm only in 9th!

Answer 4

sorry dont know