Gene Expression

Gene expression is the ability for a gene to be:

• in the genome.

• transcribed.

• non-coding.

• a dominant allele.

what does a promoter do?

• it allows a gene to be transcribed
• it creates a DNA segment
• it is another word for ribosomes
• it is another word for RNA

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

Genes can be turned on (expressed) when a(n) ____ such as CRP or cAMP receptor protein binds to the CRP binding site.

• repressor

• corepressor

• inducer

• activator

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

The DNA is tightly wrapped around the histone proteins and the gene is methylated.

• The gene is silenced.

• The gene is active.

• It is impossible to tell.

• The gene is on and off at various times.

The protein DNA wraps around to form a nucleosome.

• Gene

• Chromosome

• Nucleus

• Histone

These chemical tags inactivate or silence a gene.

• acetyl groups

• methyl groups

• histones

• genes

Which of the genes below would you want to have demethylated in your body? Select all that apply.

• Cancer causing genes

• Genes associated with anxiety.

• tumor suppressor genes

• genes related to immune system function

Which model would be an accurate model of a demethylated or acetylated gene?

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