Unit 6 part 2 review

The lac operon is an example of an inducible operon. Which of the following describes the process that occurs when lactose is present?

• The lactose binds to the repressor which inactivates it and the repressor binds to the operator to turn translation on.

• The lactose binds to the repressor which activates it and the repressor releases from the operator to turn translation on.

• The lactose binds to the repressor which inactivates it and the repressor releases from the operator to turn translation on.

• The lactose binds to the repressor which activates it and the repressor binds to the operator to turn translation on.

Tags

NGSS.HS-LS3-1

The trp operon is an example of a repressible operon. Which of the following describes the process that occurs when tryptophan is present?

• The tryptophan binds to the repressor which inactivates it and the repressor binds to the operator to turn translation off.

• The tryptophan binds to the repressor which activates it and the repressor releases from the operator to turn translation off.

• The tryptophan binds to the repressor which inactivates it and the repressor releases from the operator to turn translation off.

• The tryptophan binds to the repressor which activates it and the repressor binds to the operator to turn translation off.

Tags

NGSS.HS-LS1-3

In the trp operon, the tryptophan binds to the repressor. Which of the following is the term used to describe this molecule?

• Inducer

• Corepressor

• Enhancer

• CAP

In the lac operon, the allolactose binds to the repressor. Which of the following is the term used to describe this molecule?

• Inducer

• Corepressor

• Enhancer

• CAP

Which of the following describes the type of pathway that an inducible operon controls?

• Anabolic pathway

• Catabolic pathway

Which of the following describes the type of pathway that a repressible operon controls?

• Anabolic pathway

• Catabolic pathway

Which of the following describes the function of the operator in the operon?

• Site of repressor binding for on/off switch

• Site of RNA polymerase binding for transcription

• Site of promoter binding for RNA synthesis

• Site of inducer binding for activation of pathway

Which of the following describes the function of the promoter in the operon?

• Site of repressor binding for on/off switch

• Site of RNA polymerase binding for transcription

• Site of operator binding for RNA sythensis

• Site of inducer binding for activation of pathway

Which of the following describes how a plasmid and gene of interest are combined to create a vector?

• A restriction enzyme binds to the same restriction site on both DNA strands then DNA ligase seals phosphodiester linkages

• A primer binds to the gene of interest to facilitate the process of inserting the gene into the plasmid

• A helicase unwinds the DNA to allow for the gene of interest to be inserted then DNA ligase seals phosphodiester linkages

• A DNA polymerase uses the gene of interest as a template to insert the gene into the plasmid

Which of the following describes why Taq polymerase is required for PCR?

• The Taq polymerase is able to unwind the DNA double helix reducing the need of additional enzymes

• The Taq polymerase binds to the DNA without a required primer facilitating the process of PCR

• The process of PCR requires prokaryotic polymerase as it is less complex

• The process of PCR requires extremely high temperatures that would denature other polymerases