Gene regulation and mutation revision

Prokaryotes regulate gene expression primarily

• in order to maintain homeostasis
• in response to changing environmental conditions
• during development as cells specialize
• Prokaryotes do not regulate gene expression. All genes are always on

Alternative RNA splicing involves

• removing introns and splicing the same exons together
• removing exons and splicing the same introns together
• removing introns and splicing different exons together
• removing exons and splicing different introns together

Eukaryotes need to regulate their genes

• during cell specialization that occurs during development
• in order to maintain homeostasis
• both a and b
• neither a or b

An operon is

• a genetic on/off switch in prokaryotes
• a genetic on/off switch in eukaryotes
• a group of related genes and the associated gene switches in prokaryotes
• a group of related genes and the associated gene switches in eukaryotes

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

• activator, operator
• repressor, operator
• corepressor, operator
• repressor, promotor

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

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

• True
• False

specific sequence within the DNA that bind transcription factors to turn transcription on or off

• Regulator
• Promotor
• Operator

A segment of DNA produces methionine, threonine, histidine, aspartate, and glycine when translated. A substitution mutation occurs and causes the synthesis of the segment shown. Which is the new peptide chain when the new DNA segment is translated?

• methionine, leucine, histidine, aspartate, glycine
• methionine, phenylalanine, histidine, aspartate, glycine
• Methionine, proline, histidine, aspartate, glycine
• methionine, serine, histidine, aspartate, glycine

Part of a chromosome is reversed.

• Inversion Mutation
• Deletion Mutation
• Translocation
• Point Mutation