Gene Regulation DNA dependent

All the genes in both a prokaryotic cell and a eukaryotic cell are expressed at the same time.

• True

• False

What is the main function of transcriptional regulation?

• To regulate DNA replication

• To control gene expression

• To modify proteins

• To produce lipids

One way to regulate the expression of a gene is to control the formation of mRNA. This is called ___ control.

• transcriptional

• translational

• post-transcriptional

• post-translational

Which DNA sequences regulate transcription by binding transcription factors?

• A) Ribosomes

• Codons

• Cis-acting sequences

• Codons

What are general transcription factors?

• Proteins that regulate DNA replication

• Proteins required for basal transcription

• Proteins that translate mRNA

• Enzymes that cut DNA

Genes can be shut off (not expressed) when a ___ binds to the ____.

• activator, operator

• repressor, silencer

• corepressor, operator

• repressor, promotor

What happens if a promoter is absent?

• Transcription occurs at a high level

• Transcription does not occur

What term describes a low level of transcription with only the promoter?

• High transcription

• No transcription

• Basal transcription

• Silent transcription

Which regulatory sequence is typically located close to the promoter?

• Enhancer

• Silencer

• Cis-acting sequence

• Stop codon

Negative control of gene expression is mediated by __ and results in a(n) __ in the frequency of transcription.

• activators, increase

• activators, decrease

• repressors, increase

• repressors, decrease