Science worksheets for class 12
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True or False: All of your body cells contain the same genes.
True
False
What is an operon?
a part of a ribsome
a part of a Rna
a unit made up of linked genes that code for proteins needed to do a specific task
needed for dna replication
Operons are found in which of the following organisms?
Bacteria(prokaryotes)
plants and animals(eukaryotes)
only animals
virsuses
What does a promoter do?
binds RNA polymerase for transcription
binds DNA polymerase for replication
binds the operator
binds the repressor
The lac operon genes only become expressed if:
lactose binds to repressor
glucose binds to repressor
repressor binds to operator
lactose binds to operator
What is the name of the stretch of DNA where RNA polymerase binds?
operator
promoter
enhancer
regulatory gene
What does the lactose do to the Operon?
Blocks transcription of the lactase gene by cutting up the DNA
Binds to the repressor preventing it from attaching to the operator
The lactose binds promoter to prevent transcription
Allows for the transcription rate of lactase to slow down
Regulatory proteins (transcription factors) may
encourage transcription
prevent transcription
stop transcription once its started
either encourage or prevent transcription
In a repressible operon, the corepressor
allows transcription to progress
allow the repressor to prevent transcription
binds to the promoter and transcribes the gene
When subunits are available in the environment, a cell will use them to create necessary macromolecules. What type of operon would it most likely use for this process?
repressible operon
inducible operon
In the lac operon the inducer is
lactose
glucose
galactose
all of the above
What is 1 in the diagram?
RNA polymerase
Inducer
Repressor
Operator
What is 2 in the diagram?
RNA polymerase
Inducer
Repressor
Operator
In the top picture the operon is
on
off
What type of operon is the trp (tryptophan) operon?
inducible
repressible
positive control
promotor
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