Chapter 18 Review

Front

What is the role of tryptophan in gene regulation?

Back

Corepressor

Front

What is the role of an active repressor in gene expression?

Back

It binds to the operator to inhibit transcription.

Front

What is epigenetic inheritance?

Back

The inheritance of traits transmitted by mechanisms not directly involving the nucleotide sequence.

Front

What is an example of post-transcriptional control of gene expression?

Back

The removal of introns and alternative splicing of exons.

Front

What happens if the repressor of an inducible operon cannot bind the operator?

Back

Continuous transcription of the operon's genes occurs.

Front

Define corepressor in the context of gene regulation.

Back

A molecule that binds to a repressor protein, enabling it to bind to the operator and inhibit transcription.

Front

What is the function of a promoter in gene expression?

Back

It is a DNA sequence that initiates transcription of a particular gene.

Front

Explain the concept of alternative splicing.

Back

The process by which different combinations of exons are joined together to produce multiple protein variants from a single gene.

Front

What is the significance of histone acetylation in gene expression?

Back

It typically enhances gene expression by loosening the DNA-histone interaction.

Front

What are transcription factors?

Back

Proteins that help regulate the transcription of specific genes by binding to nearby DNA.