Exam 11: Regulation of Gene Expression in Bacteria and Their Viruses

RNA polymerase binds to the promoter and transcribes the ara operon.In the presence of arabinose,both the CAP-cAMP complex and the AraC-arabinose complex must bind to:

Gene regulation in bacteria and bacteriophage utilize the following terminology.Twelve terms are given below (a - l), followed by twelve statements.Write the letter of the correct term.A single letter is sufficient.Not all letters need be used.Some letters may be used more than once. Term List -small molecules that bind to regulatory molecule,such as repressor

In the presence of the repressor molecule and free tryptophan,the trp operon is:

Which of the following is/are NOT part of the trp operon?

Under conditions where tryptophan is scarce:

In Bacillus,the presence of alternate forms of which molecule is responsible for the control of large numbers of genes?

A prokaryotic operon is composed of a series of adjacent genes under the control of:

Gene regulation in bacteria and bacteriophage utilize the following terminology.Twelve terms are given below (a - l), followed by twelve statements.Write the letter of the correct term.A single letter is sufficient.Not all letters need be used.Some letters may be used more than once. Term List -phenotype of trp R⁺ O⁺ S⁺ in the presence of tryptophan

Which of the following DNA-binding proteins contain a helix-turn-helix domain?

Consider an E.coli cell with the following mutations.What effect would each mutation have on the function of the lac operon (assuming no glucose is present)? a)a mutant lac operator that cannot bind repressor b)a mutant lac repressor that cannot bind the lac operator c)a mutant lac repressor that cannot bind to allolactose d)a mutant lac promoter that cannot bind CAP plus cAMP

Which of the following is an example of a cis-acting element?

In the presence of abundant tryptophan:

The enzyme $\beta$ -galactosidase can convert the disaccharide lactose into:

Which of the following is an example of a trans-acting factor?

A super repressor mutation (I^S)results in:

The order of the structural genes controlling the trp operon is:

The repression of the transcription of lactose-metabolizing genes in the presence of glucose is an example of:

A constitutive operator mutation (O^c)results in:

A partial diploid of genotype I⁺ P⁺ O⁺ Z⁺ Y^- / I⁺ P^- O⁺ Z⁺ Y⁺ will show:

Gene regulation in bacteria and bacteriophage utilize the following terminology.Twelve terms are given below (a - l), followed by twelve statements.Write the letter of the correct term.A single letter is sufficient.Not all letters need be used.Some letters may be used more than once. Term List -type of operons responding to catabolite repression (glucose effect)