AP Biology Operons

Lac operons are an example of __________ control, while trp operons are an example of __________ control.

• negative, regulatory

• regulatory, complete

• positive, negative

• apparent, nonapparent

Select all true statements about operons.

• The operator is an on-off switch.

• The repressor in an operon attaches to the promoter.

• The RNA polymerase attaches to the strand when the repressor is removed.

• The promoter is the spot where the gene attaches to the strand.

Organisms like E. Coli undergo ______ ____________ (two words) to adapt itself to metabolize certain substances.

Tags

NGSS.HS-LS4-4

Regulatory genes:

• regulate another gene further down the chain

• make regulatory proteins that latch on in other places

• both of these

• neither of these

In the absence of an inducer, gene expression of an inducible promoter will be

• on

• off

• halfway on

When a gene is activated _________ binds to the DNA at the start of the gene and moves along the DNA to create mRNA

• keritanase

• RNA polymerase

• TAQ polymerase

• catalyase

What is the purpose of transcription?

• to create mRNA so that a specific protein can be coded for

• to aide the cell in creating cellular energy (ATP)

• to bind amino acids together to form a polypeptide

• to ensure that daughter cells have the same DNA as the mother cell

Regulatory proteins help express a _________.

Tags

NGSS.HS-LS1-1

How does the repressor in an operon function when considering negative control?

• A molecule attaches to the operator, and when it is removed, the operator is turned off, allowing the RNA polymerase to attach to the strand.

• It enables the process until it loses a gene attached to it.

• Both of these

• Neither of these

What does the operon model attempt to explain?

• the coordinated control of gene expression in bacteria

• the mechanism of viral attachment to a host cell