Control of gene expression

All the cells in your body express the same exact genes.

• True

• False

Some steps of gene expression are regulated.

• True

• False

Which of the following groups loosens DNA so transcription can occur?

• Histone methylation

• Histone lamination

• Histone phosphorylation

• Histone acetylation

Proteins that bind directly to DNA and affect whether and how fast a gene is transcribed:

• Transcription factors

• Translation factors

• Replication factors

• Expression factors

Activators speed up transcription by:

• Binding to a silencer

• Binding to an enhancer

• Binding to a promoter

• Binding to a repressor

Mechanisms that delay post transcriptional modifications also delay the delivery of mRNA to the cytoplasm for translation. These mechanisms include:

• Alternative splicing

• 5' cap

• 3' poly-A tail

• Nuclear pores

To transport mRNA to the cytoplasm, some proteins attach to the ________ in mRNA:

• Promoter region

• Terminator region

• Elongation region

• Zip code region

The longer an mRNA persists in the cytoplasm, the more protein molecules can be made from it.

• True

• False

Tiny bits of RNA that can shut down translation of particular mRNAs:

• RNA interference

• MicroRNAs

• MacroRNAs

• tRNAs

Mechanism in which any double stranded RNA is cut up into pieces that are taken up by special enzyme complexes is called:

• Alternative splicing

• RNA interference

• Post transcriptional modification

• DNA interference