28) Briefly define what is meant by negative and positive control of the lac ope

Question

28) Briefly define what is meant by negative and positive control of the lac operon. 29) At the molecular level, how do proteins like repressors bind to DNA? How can bi nding affinities be increased or decreased? Sually have atleaur two 3Hes Don bnlny Danaun 2) lostene site 30) Microbial genomics is a rapidly growing field. Of great interest to geneticists is the search for new operons as new microbial genome sequences become available. What kind of "signature" or identifying feature would you look for as you searched new genomes for candidate operons?

Explanation / Answer

a. A group of structural genes that are arranged under a common promoter.

b. Common operator, that controls these gene expression.

c. the regulator molecules, including activators/ inducers, repressors/co-repressors, that negatively or positively induce transcription of the regulated gene under a common promoter-operator system.

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