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WorksheetsGene regulation
Total questions: 14
Worksheet time: 8mins
When will a lac operon be activated?
Glucose is low and lactose is present
Glucose is high and lactose is absent
both glucose and lactose is high
both glucose and lactose is low
DNA is coiled around
chromatin
histones
nucleosome
nucleus
Bacterial genes are organized into
promotors
operons
regulator genes
structural genes
Where does the RNA Polymerase bind to for the initiation of
Regulator
Structural genes
Operator
Promotor
In prokaryotes, gene expression is regulated at various different levels
true
false
specific sequence within the DNA that bind transcription factors to turn transcription on or off
Regulator
Promotor
Operator
Structural genes
When tryptophan (try) is absent, the trp represser unbinds from the operator and this results in RNA synthesis to do what?
be blocked
proceed
Inducible operon s
lac operon
trp open
bound to a repressor under normal conditions
similar to competitive inhibition
RNA polymerase needs --- to initiate transcription.
holoenzymes
transcriptional factors
histones
microRNA
T/F In prokaryotes, gene expression is regulated at various different levels
T
F
which represents eukaryotic gene expression?
gene expression is regulated at many levels
rna transcription occurs prior to protein synthesis
contain nucleus
environmental factos control transcription
which represent prokaryotic gene expression?
lack nucleus
DNA is confined to a nuclear compartment
RNA transcription and protein formation occur almost simulatneously
gene expression is regulated at many levels
which is correct?
heterochromatin-dense, no transcription;
euchromatin- not dense, transcription
euchromatin-dense, no transcription;
heterochromatin- not dense, transcription
histone acetylation- increase transcription; histone methylation (and DNA methylation)- decrease transcription
histone methylation- increase transcription; histone acetylation- decrease transcription
regarding the translational initiation complex (ribosome + eIF-2), which is correct?
if eIF-2 is phosphorylated, translation is blocked
if eIF-2 is not phosphorylated, translation occurs
if eIF-2 is not phosphorylated, translation is blocked
if eIF-2 is phosphorylated, translation occurs
