15. Central Dogma & Gene Regulation

Altering patterns of gene expression in prokaryotes would likely increase a prokaryote's survival by _______.

Which of the following is true about operons?

Which of the following molecules is a protein that stops the transcription of a gene?

When this is present in the cell, it binds to the repressor and the repressor can no longer bind to the operator:

Identify when (before transcription, after transcription but before translation, after translation) each of the following regulatory mechanisms functions.

a. ATP combines with an enzyme, altering its shape.

b. A short RNA is synthesized that is complementary to mRNA.

c. Methylation of DNA occurs.

d. An inducer combines with a repressor.

Select all the true statements about repressible operons: (NCLEX/HESI/TEAS)

a. By default they are on until turned off.

b. An example is the lactose operon.

c. An example is the arginine operon.

d. A repressor must bind to the operator in order for the operon to be turned off.

An operon consists of __________ , ___________ , and __________ , and is associated with a regulatory gene.

In general, __________ operons are inactive until the substrate of their genes’ polypeptides is present.