How do bacteria avoid wasteful production of unnecessary proteins when their genes are always on? The answer lies in regulating the operon. As trp levels increase, trp binds to trpR, causing a ...

This is a preview. Log in through your library . Abstract We have cloned a DNA fragment harboring the genes for ribosomal proteins L2, L4, and L23 on a plasmid vector that contains a lac operator and ...

A model is proposed that accounts for regulation of the histidine operon by a mechanism involving alternative configurations of mRNA secondary structure (the alternative stem model). New evidence for ...