WorksheetsUnit 6 AP Bio
Total questions: 15
Worksheet time: 15mins
Introns are significant to biological evolution because
their presence allows exons to be shuffled.
they protect the mRNA from degeneration.
A mutation in which of the following parts of a gene is likely to be most damaging to a cell?
intron
exon
Alternative RNA splicing
is a mechanism for increasing the rate of transcription.
can allow the production of proteins of different sizes from a single mRNA
When does translation begin in prokaryotic cells?
as soon as transcription has begun
once the pre-mRNA has been converted to mRNA
Why might a point mutation in DNA make a difference in the level of proteinʹs activity?
It might substitute an amino acid in the active site.
It might exchange one stop codon for another stop codon.
A frameshift mutation could result from
a base insertion only.
either an insertion or a deletion of a base.
a base deletion only.
What does the operon model attempt to explain?
the coordinated control of gene expression in bacteria
the mechanism of viral attachment to a host cell
The tryptophan operon is a repressible operon that is
turned off whenever tryptophan is added to the growth medium
turned on only when glucose is present in the growth medium.
When this is taken up by the cell, it binds to the repressor so that the repressor no longer binds to the operator:
inducer
repressor
Transcription of the structural genes in an inducible operon
occurs continuously in the cell.
starts when the pathwayʹs substrate is present.
Muscle cells and nerve cells in one species of animal owe their differences in structure to
having different genes.
having different genes expressed.
If you were to observe the activity of methylated DNA, you would expect it to
be unwinding in preparation for protein synthesis.
have turned off or slowed down the process of transcription.
This can inhibit transcription by blocking the binding of positively acting transcription factors to the DNA:
enhancer
promoter
repressor
Which of the following separates molecules by movement due to size and electrical charge?
gel electrophoresis
gene cloning
Which of the following processes is directly involved in the synthesis of proteins in a cell?
Transcription
Translation
Replication
Mutation
