AP Biology- OPERONS with
100% correct answers
already graded A+(VERIFIED
& UPDATED)
operon - answer unit of genetic function found in bacteria that consists of
a promoter, operator, and a cluster of genes whose products function in a
common pathway; goal is to save energy
operator - answer regulatory switch that is in the promoter
repressor - answer off switch; prevents genes transcription by binding to
the operator and blocking the RNA polymerase; product of a separate
regulatory gene; can be active or inactive, it just depends on the presence
of other molecules
inducible operons (lac operon) - answer transcription of this DNA segment
is usually OFF; stimulated when a specific molecule interacts with a
regulatory protein; catabolic; usually OFF bc reactants needed for the
coded instructions are not always present; once reactants are present
they cause this DNA to turn ON; done in an effort to conserve energy
repressible operon (trp operon) - answer transcription usually ON; can be
inhibited (repressed) when a specific molecule bonds to a regulatory
protein; if the products of this gene hits a certain level they will cause the
operon to turn OFF; products act as the specific molecule; anabolic
histone acetylation - answer acetyl groups are attached to positively
charged lysines in histone tails; loosens chromatin structure, promoting
initiation of transcription
100% correct answers
already graded A+(VERIFIED
& UPDATED)
operon - answer unit of genetic function found in bacteria that consists of
a promoter, operator, and a cluster of genes whose products function in a
common pathway; goal is to save energy
operator - answer regulatory switch that is in the promoter
repressor - answer off switch; prevents genes transcription by binding to
the operator and blocking the RNA polymerase; product of a separate
regulatory gene; can be active or inactive, it just depends on the presence
of other molecules
inducible operons (lac operon) - answer transcription of this DNA segment
is usually OFF; stimulated when a specific molecule interacts with a
regulatory protein; catabolic; usually OFF bc reactants needed for the
coded instructions are not always present; once reactants are present
they cause this DNA to turn ON; done in an effort to conserve energy
repressible operon (trp operon) - answer transcription usually ON; can be
inhibited (repressed) when a specific molecule bonds to a regulatory
protein; if the products of this gene hits a certain level they will cause the
operon to turn OFF; products act as the specific molecule; anabolic
histone acetylation - answer acetyl groups are attached to positively
charged lysines in histone tails; loosens chromatin structure, promoting
initiation of transcription
