Question 1

Show how glutamine interacts with an A-T base pair as seen in the cI and Cro repressors.

Accepted Answer

The answer of Show how glutamine interacts with an A-T...

Question 2

Which of the following structural features of the trp leader sequence,trpL,explains why transcription of the full trp operon is prevented even when the repressor is not bound to the operon?

Accepted Answer

A) an A-rich region of the template strand acts as a factor-independent transcription terminator 
B) there is a stop codon present as the 15th codon of the trpL sequence 
C) the ribosome is stalled at two adjacent Trp codons under conditions where Trp is low 
D) a charged tRNATrp binds to one of the adjacent Trp codons to block ribosomal movement 
E) none of the above 
A) an A-rich region of the template strand acts as a factor-independent transcription terminator 
B) there is a stop codon present as the 15th codon of the trpL sequence 
C) the ribosome is stalled at two adjacent Trp codons under conditions where Trp is low 
D) a charged tRNATrp binds to one of the adjacent Trp codons to block ribosomal movement 
E) none of the above

Question 3

Bacteriophage $\lambda$ establishment of lysogeny in E.coli cells requires a high concentration of _____.This is achieved by the ____ protein binding to the PRE regulatory site.

Accepted Answer

A) Cro;cI 
B) Cro;cII 
C) Cro;cIII 
D) cI;cII 
E) cI;cIII 
A) Cro;cI 
B) Cro;cII 
C) Cro;cIII 
D) cI;cII 
E) cI;cIII

Question 4

At the transcriptional level,how does tryptophan control the production of genes within the trp operon?

Accepted Answer

A) the trp repressor contains a high percentage of Trp residues and is thus only produced when Trp levels are high 
B) without sufficient Trp,the production of the trp repressor is truncated,thus producing a protein that cannot bind to the operon,ultimately resulting in structural gene expression 
C) high levels of Trp cause the repressor to be proteolytically digested 
D) the trp repressor binds to the operon only when bound to Trp 
E) none of the above 
A) the trp repressor contains a high percentage of Trp residues and is thus only produced when Trp levels are high 
B) without sufficient Trp,the production of the trp repressor is truncated,thus producing a protein that cannot bind to the operon,ultimately resulting in structural gene expression 
C) high levels of Trp cause the repressor to be proteolytically digested 
D) the trp repressor binds to the operon only when bound to Trp 
E) none of the above

Show how glutamine interacts with an A-T base pair as seen in the cI and Cro repressors.

Which of the following structural features of the trp leader sequence,trpL,explains why transcription of the full trp operon is prevented even when the repressor is not bound to the operon?

Bacteriophage $\lambda$ establishment of lysogeny in E.coli cells requires a high concentration of _.This is achieved by the protein binding to the P_RE regulatory site.

At the transcriptional level,how does tryptophan control the production of genes within the trp operon?

The Scope of Biochemistry

The Matrix of Life: Weak Interactions in an Aqueous Environment

The Energetics of Life

Nucleic Acids

Introduction to Proteins: the Primary Level of Protein Structure

The Three-Dimensional Structure of Proteins

Protein Function and Evolution

Contractile Proteins and Molecular Motors

Carbohydrates: Sugars,saccharides,glycans

Lipids,membranes and Cellular Transport

Enzymes: Biological Catalysts

Chemical Logic of Metabolism

Carbohydrate Metabolism: Glycolysis, gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

Citric Acid Cycle and Glyoxylate Cycle

Electron Transport, oxidative Phosphorylation, and Oxygen Metabolism

Photosynthesis

Lipid Metabolism I: Fatty Acids,triacylglycerols,and Lipoproteins

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Lipid Metabolism Ii: Membrane Lipids, steroids, isoprenoids, and Eicosanoids

Metabolism of Nitrogenous Compounds I: Principles of Biosynthesis, utilization, and Turnover

Metabolism of Nitogenous Compounds Ii: Amino Acids, porphyrins, and Neurotransmitters

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes,genomes and Chromosomes

Dna Replication

Dna Restructuring: Repair,recombination,rearrangement,amplification

Information Readout: Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Filters

Exam 29: Regulation of Gene Expression

Show how glutamine interacts with an A-T base pair as seen in the cI and Cro repressors.

Which of the following structural features of the trp leader sequence,trpL,explains why transcription of the full trp operon is prevented even when the repressor is not bound to the operon?

Bacteriophage λ\lambdaλ establishment of lysogeny in E.coli cells requires a high concentration of _____.This is achieved by the ____ protein binding to the PRE regulatory site.

At the transcriptional level,how does tryptophan control the production of genes within the trp operon?

The Scope of Biochemistry

The Matrix of Life: Weak Interactions in an Aqueous Environment

The Energetics of Life

Nucleic Acids

Introduction to Proteins: the Primary Level of Protein Structure

The Three-Dimensional Structure of Proteins

Protein Function and Evolution

Contractile Proteins and Molecular Motors

Carbohydrates: Sugars,saccharides,glycans

Lipids,membranes and Cellular Transport

Enzymes: Biological Catalysts

Chemical Logic of Metabolism

Carbohydrate Metabolism: Glycolysis, gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

Citric Acid Cycle and Glyoxylate Cycle

Electron Transport, oxidative Phosphorylation, and Oxygen Metabolism

Photosynthesis

Lipid Metabolism I: Fatty Acids,triacylglycerols,and Lipoproteins

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Lipid Metabolism Ii: Membrane Lipids, steroids, isoprenoids, and Eicosanoids

Metabolism of Nitrogenous Compounds I: Principles of Biosynthesis, utilization, and Turnover

Metabolism of Nitogenous Compounds Ii: Amino Acids, porphyrins, and Neurotransmitters

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes,genomes and Chromosomes

Dna Replication

Dna Restructuring: Repair,recombination,rearrangement,amplification

Information Readout: Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Filters

Bacteriophage $\lambda$ establishment of lysogeny in E.coli cells requires a high concentration of _.This is achieved by the protein binding to the P_RE regulatory site.