MolBio Lec Finals: Lesson 12: Control of Gene Expression

A single gene may use a regulatory site to control the expression of that gene, but genes rarely have multiple regulatory sites.

• TRUE
• FALSE

Which of the following are not matched correctly?

• exon splicing-occurs in nucleus
• post-translational modifications-phosphorylation
• snRNA-splice out exons from transcript
• activated enhancers-trigger transcription
• all are matched correctly

Which of the following is part of an operon?

• structural genes

• an operator

• a promoter

• a CAP binding site

• all of the choices

Proteins that block the passage of RNA polymerase are called:

• operons
• activators
• repressors
• enhancers
• promoters

In eukaryotic gene regulation, the location of the promoter is always before and the location of the enhancer always after the gene being regulated.

• True
• False

In an operon the location of the regulatory region occurs ________ the structural genes.

• after
• within
• before

Which is not part of the lac operon?

• repressor

• activator protein

• operator

• promotor

• structural gene

In the absence of glucose, E. coli can import lactose to change into glucose and galactose because CAP binds to the

• cAMP
• DNA
• lac operon
• operator
• repressor

E. coli is able to use foods other than glucose in the absence of available glucose, because falling levels of glucose cause an increase of

• cAMP
• CAP
• lactase
• glu operons
• E) tRNA

In eukaryotes, many genes may have to interact with each other, requiring more interacting elements than can fit around a single promoter. This physical limitation is overcome by

• alternating promoters and operators
• placing promoters on both sides of each gene
• the use of very long promoters
• distant sites in a chromosome controlling transcription of a gene
• having factors on one chromosome control genes on another gene