Section 14.3 Quiz

What is a homeobox gene?

• A gene that codes for transcription factors

• A type of RNA

• A cellular organelle

• A protein

What role does an operator play in gene expression?

• It initiates transcription

• It binds to a repressor protein

• It codes for proteins

• It is a type of RNA.

Which of the following is not a part of gene regulation?

• Operon

• Operator

• Differentiation

• Mitochondria

Which of the following statements is true about E. coli?

• It has less than 1000 genes

• It has a genetic library of more than 4000 genes

• It cannot regulate its genes

• It does not have operons.

What is the role of the repressor in the Lac Operon?

• To bind to lactose

• To bind to the operator and block transcription

• To bind to the promoter

• To enhance transcription.

What is the result of lactose binding to the repressor in the Lac Operon?

• Transcription is blocked

• The repressor binds to the operator

• The repressor is released and transcription occurs

• RNA polymerase is inhibited.

What is lactose composed of?

• Glucose and fructose

• Galactose and glucose

• Sucrose and glucose

• Galactose and fructose

In the presence of lactose, the lac repressor becomes ___.

• Active

• Inactive

• Degraded

• Amplified

What is the effect of lactose on the lac operon?

• It inhibits the operon

• It activates the operon

• It degrades the operon

• It replicates the operon.

Fill in the blank: Transcription factors can activate scores of genes at once, thereby dramatically affecting patterns of gene ______.

• A) expression

• B) degradation

• C) mutation

• D) replication