#Question id: 3988
#Unit 3. Fundamental Processes
The tryptophan operon of E. coli is repressed by tryptophan added to the growth medium. The tryptophan repressor probably:
#Question id: 3989
#Unit 3. Fundamental Processes
Which one of the following statements about the transcription attenuation mechanism is true?
#Question id: 3990
#Unit 3. Fundamental Processes
Which of the following statements is true of the attenuation mechanism used to regulate the tryptophan biosynthetic operon in E. coli?
#Question id: 3991
#Unit 3. Fundamental Processes
Attenuation in the trp operon of E. coli:
#Question id: 3992
#Unit 3. Fundamental Processes
RecA protein provides the functional link between DNA damage and the SOS response by displacing the LexA protein from its operator sites on the SOS genes. RecA does so by:
#Question id: 3993
#Unit 3. Fundamental Processes
An example of coordinate control is the down-regulation of ribosomal RNA synthesis in response to amino acid starvation, which will cause synthesis of ribosomal proteins to be limited. What is the correct order of the following events that participate in the signaling process?
1. Binding of stringent factor to the ribosome.
2. Formation of the unusual nucleotide ppGpp.
3. Formation of the unusual nucleotide pppGpp.
4. Uncharged tRNA binds in the ribosomal A-site.