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:

Which of the following statements is FALSE?

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:

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.

Describe the operon model of gene regulation.

Which of the following is not part of an operon?

a. Operator

b. Promoter

c. Origin

d. Gene