BIOL 1107 EXAM 3 KEY QUESTIONS
AND ANSWERS
What is an ORF?
A.an intronic region of DNA
B.a part of the poly-A region of the mature mRNA transcript
C.an open reading frame containing 100 base pairs or more following a start codon
D.a stop codon
E.a type of tRNA - ANSWER-C.an open reading frame containing 100 base pairs or
more following a start codon
Mendel concluded based on his pea studies that
A.if an individual inherits 2 different versions of a gene, one version is dominant and
the other is recessive
B.If an individual inherits 2 different versions of a gene, the versions will cancel out
and nothing will be expressed
C.If an individual inherits 2 different versions of a gene, both versions will be
expressed and detectable in the phenotype of the individual
D.If an individual inherits 2 different versions of a gene, the individual will be true
breeding
E.if an individual inherits 2 different versions of a gene, it will die - ANSWER-A.if an
individual inherits 2 different versions of a gene, one version is dominant and the
other is recessive
This question is about a double character cross for 2 pea plants. Pea seed
roundness is controlled by the R gene - R is dominant and codes for round seeds
and r is recessive and codes for wrinkled seeds. Pea seed color is controlled by the
Y gene - Y is dominant and codes for yellow seeds and y is recessive and codes for
green seeds. In this double character cross, which of the following describes the
offspring? See figure D on Exam Figures document on HuskyCT if this figure will not
load.
RYryRYry x RYRYRYRY
A.100% of the offspring have wrinkled, green seeds
B.100% of the offspring have round, yellow seeds
C.50% of the offspring have green seeds
D.50% of the offspring have wrinkled seeds
E.Only 50% of the offspring will have round, yellow seeds - ANSWER-B.100% of the
offspring have round, yellow seeds
C.
Mendel
A.studied genes with multiple (>2) alleles in his studies with peas
B.crossed peas that were true breeding for 1 or 2 characters
C.kept meticulous notes of his pea crosses
D.A and C - studied genes with multiple (>2) alleles in his studies with peas and kept
meticulous notes
, E.B and C - crossed peas that were true breeding for 1 or 2 characters and kept
meticulous notes of his pea crosses - ANSWER-E.B and C - crossed peas that were
true breeding for 1 or 2 characters and kept meticulous notes of his pea crosses
Imagine a transmembrane receptor that autophosphorylates and dimerizes. This is
most likely an example of
A.a GPCR
B.an RTK
C.a ligand-gated ion channel
D.a hormone receptor
E.guanylyl cyclase - ANSWER-B.an RTK
A recombinant plasmid MUST
A.Contain your gene of interest
B.Lack antibiotic resistance genes
C.Be linear
D.Contain an ampR gene
E.Be knocked out - ANSWER-A.Contain your gene of interest
Pea flower color is controlled by the dominant allele P (purple) and the recessive
allele p (white).
A. PP individuals are white
B. pp individuals are purple
C. Pp individuals are purple
D. The phenotype cannot be predicted
E. Pp individuals are white - ANSWER-C.Pp individuals are purple
Imagine a new DNA sequence has been identified within the groundhog genome.
The sequence codes for a start codon followed by 300 nucleotides and then a stop.
If you were a researcher given this information, which of the following would you do
in order to understand the new sequence's function?
A. Create a knockout groundhog that is missing the new DNA sequence so you can
examine the effects of the sequence's absence
B.PCR
C. Gel electrophoresis
D. Compare the new nucleotide sequence to very different, known gene sequences
in other species
E. Create a cloning vector and copy the sequence - ANSWER-A.Create a knockout
groundhog that is missing the new DNA sequence so you can examine the effects of
the sequence's absence
In cell communication via direct contact
A. plasmodesmata may be used
B. electrical synapses may be used
C. the bloodstream is used to transport chemical signals
D.A and B - plasmodesmata may be used AND electrical synapses may be used
E.A and C - plasmodesmata may be used AND the bloodstream is used to transport
chemical signals - ANSWER-D.A and B - plasmodesmata may be used AND
electrical synapses may be used
AND ANSWERS
What is an ORF?
A.an intronic region of DNA
B.a part of the poly-A region of the mature mRNA transcript
C.an open reading frame containing 100 base pairs or more following a start codon
D.a stop codon
E.a type of tRNA - ANSWER-C.an open reading frame containing 100 base pairs or
more following a start codon
Mendel concluded based on his pea studies that
A.if an individual inherits 2 different versions of a gene, one version is dominant and
the other is recessive
B.If an individual inherits 2 different versions of a gene, the versions will cancel out
and nothing will be expressed
C.If an individual inherits 2 different versions of a gene, both versions will be
expressed and detectable in the phenotype of the individual
D.If an individual inherits 2 different versions of a gene, the individual will be true
breeding
E.if an individual inherits 2 different versions of a gene, it will die - ANSWER-A.if an
individual inherits 2 different versions of a gene, one version is dominant and the
other is recessive
This question is about a double character cross for 2 pea plants. Pea seed
roundness is controlled by the R gene - R is dominant and codes for round seeds
and r is recessive and codes for wrinkled seeds. Pea seed color is controlled by the
Y gene - Y is dominant and codes for yellow seeds and y is recessive and codes for
green seeds. In this double character cross, which of the following describes the
offspring? See figure D on Exam Figures document on HuskyCT if this figure will not
load.
RYryRYry x RYRYRYRY
A.100% of the offspring have wrinkled, green seeds
B.100% of the offspring have round, yellow seeds
C.50% of the offspring have green seeds
D.50% of the offspring have wrinkled seeds
E.Only 50% of the offspring will have round, yellow seeds - ANSWER-B.100% of the
offspring have round, yellow seeds
C.
Mendel
A.studied genes with multiple (>2) alleles in his studies with peas
B.crossed peas that were true breeding for 1 or 2 characters
C.kept meticulous notes of his pea crosses
D.A and C - studied genes with multiple (>2) alleles in his studies with peas and kept
meticulous notes
, E.B and C - crossed peas that were true breeding for 1 or 2 characters and kept
meticulous notes of his pea crosses - ANSWER-E.B and C - crossed peas that were
true breeding for 1 or 2 characters and kept meticulous notes of his pea crosses
Imagine a transmembrane receptor that autophosphorylates and dimerizes. This is
most likely an example of
A.a GPCR
B.an RTK
C.a ligand-gated ion channel
D.a hormone receptor
E.guanylyl cyclase - ANSWER-B.an RTK
A recombinant plasmid MUST
A.Contain your gene of interest
B.Lack antibiotic resistance genes
C.Be linear
D.Contain an ampR gene
E.Be knocked out - ANSWER-A.Contain your gene of interest
Pea flower color is controlled by the dominant allele P (purple) and the recessive
allele p (white).
A. PP individuals are white
B. pp individuals are purple
C. Pp individuals are purple
D. The phenotype cannot be predicted
E. Pp individuals are white - ANSWER-C.Pp individuals are purple
Imagine a new DNA sequence has been identified within the groundhog genome.
The sequence codes for a start codon followed by 300 nucleotides and then a stop.
If you were a researcher given this information, which of the following would you do
in order to understand the new sequence's function?
A. Create a knockout groundhog that is missing the new DNA sequence so you can
examine the effects of the sequence's absence
B.PCR
C. Gel electrophoresis
D. Compare the new nucleotide sequence to very different, known gene sequences
in other species
E. Create a cloning vector and copy the sequence - ANSWER-A.Create a knockout
groundhog that is missing the new DNA sequence so you can examine the effects of
the sequence's absence
In cell communication via direct contact
A. plasmodesmata may be used
B. electrical synapses may be used
C. the bloodstream is used to transport chemical signals
D.A and B - plasmodesmata may be used AND electrical synapses may be used
E.A and C - plasmodesmata may be used AND the bloodstream is used to transport
chemical signals - ANSWER-D.A and B - plasmodesmata may be used AND
electrical synapses may be used
