Gene Regulation and Operon Function

The video tutorial explains the components and regulation of genes on a plasmid used in the P glow lab. It covers the origin of replication, AmpR gene with constitutive promoters, and GFP gene with inducible promoters. The arabinos operon and PBAD promoter are discussed, highlighting how arabinose regulates gene expression. The lab application involves inserting a plasmid into bacteria to control GFP gene expression, resulting in green fluorescence when arabinose is present.

What is the role of the origin of replication in a plasmid?

• To initiate transcription of genes

• To allow plasmid replication in bacteria

• To provide antibiotic resistance

• To regulate gene expression

Which gene provides resistance to ampicillin in the plasmid?

• araC gene

• lacZ gene

• gfp gene

• ampR gene

What is a constitutive promoter?

• A promoter that is activated by light

• A promoter that is only active in the presence of glucose

• A promoter that requires a regulator protein

• A promoter that is always active

Which gene is controlled by an inducible promoter in the plasmid?

• lacZ gene

• ampR gene

• gfp gene

• araC gene

What triggers the activation of an inducible promoter?

• Presence of a specific sugar

• Constant environmental conditions

• Absence of light

• Presence of a regulator protein

What is the function of the pBAD promoter in the arabinose operon?

• To replicate the plasmid

• To provide antibiotic resistance

• To inhibit gene expression

• To activate gene expression in the presence of arabinose

Which genes are part of the arabinose operon?

• araC, gfp, ampR

• araB, araA, araD

• gfp, ampR, araC

• lacZ, lacY, lacA

How does arabinose affect the araC protein?

• It inhibits the araC protein

• It degrades the araC protein

• It changes the shape of araC, causing it to detach from DNA

• It binds to araC and activates it

In the pGLO lab, what replaces the original genes in the arabinose operon?

• ampR gene

• gfp gene

• lacZ gene

• araC gene

What observable effect does the expression of the gfp gene have on bacteria?

• Bacteria change shape

• Bacteria become resistant to antibiotics

• Bacteria grow faster

• Bacteria glow green