Bio 181 Grand Canyon University Exam 3 Questions and Answers 100% Verified
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Bio 181 Grand Canyon University
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Bio 181 Grand Canyon University
Which of the following does not occur in prokaryotic eukaryotic gene expression, but
does in eukaryotic gene expression? - ️️C) A poly-A tail is added to the 3' end of an
mRNA and a cap is added to the 5' end.
What do we mean when we use the term monohybrid cross and dihybrid cross? -
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Bio 181 Grand Canyon University Exam
3
Which of the following does not occur in prokaryotic eukaryotic gene expression, but
does in eukaryotic gene expression? - ✔️✔️C) A poly-A tail is added to the 3' end of an
mRNA and a cap is added to the 5' end.
What do we mean when we use the term monohybrid cross and dihybrid cross? -
✔️✔️a dihybrid cross involves organisms that are heterozygous for two characters and
a monohybrid cross involves only one.
A frameshift mutation could result from - ✔️✔️E) either an insertion or a deletion of a
base.
Which of the following helps to hold the DNA strands apart while they are being
replicated? - ✔️✔️single-strand binding proteins
Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism.
Approximately what percentage of the nucleotides in this sample will be thymine? -
✔️✔️8%
What is the function of DNA polymerase III? - ✔️✔️to add nucleotides to the 3' end of a
growing DNA strand
A new DNA strand elongates only in the 5' to 3' direction because - ✔️✔️DNA
polymerase can only add nucleotides to the free 3' end.
How do we describe transformation in bacteria? - ✔️✔️assimilation of external DNA
into a cell
What is the function of topoisomerase? - ✔️✔️relieving strain in the DNA ahead of the
replication fork
Which enzyme catalyzes the elongation of a DNA strand in the 5' → 3' direction? -
✔️✔️DNA polymerase III
Which of the following nucleotide triplets best represents a codon? - ✔️✔️a triplet in the
same reading frame as an upstream AUG
, An Okazaki fragment has which of the following arrangements? - ✔️✔️DNA
polymerase I, DNA polymerase III
How many unique gametes could be produced through independent assortment by an
individual with the genotype AaBbCCDdEE ?
a) 4
b) 8
c) 16
d) 32
e) 64 - ✔️✔️b) 8
Why did the F1 offspring of Mendel's classic pea cross always look like one of the two
parental varieties?
a) no genes interacted to produce the parental phenotype.
b) each allele affected phenotypic expression.
c) the traits blended together during fertilization.
d) one phenotype was completely dominant over another.
e) different genes interacted to produce the parental phenotype. - ✔️✔️d) one
phenotype was completely dominant over another.
When crossing an organism that is homozygous recessive for a single trait with a
heterozygote, what is the chance of producing an offspring with the homozygous
recessive phenotype? - ✔️✔️50%
Which of the following is an example of polygenic inheritance? - ✔️✔️skin pigmentation
in humans
Which of the following is false, regarding the law of segregation?
a) it states that each of two alleles for a given trait segregate into different gametes
b) it can be explained by the segregation of homologous chromosomes during meiosis
c) it can account for the 3:1 ratio seen in the F2 generation of mender's crosses
d) it can be used to predict the likelihood of transmission of certain genetic diseases
within families
e) it is a method that can be used to determine the number of chromosomes in a plant -
✔️✔️e) it is a method that can be used to determine the number of chromosomes in a
plant
Phenylketonuria (PKU) is a recessive human disorder in which an individual cannot
appropriately metabolize a particular amino acid. The amino acid is not otherwise
produced by humans. Therefore, the most efficient and effective treatment is which of
the following?
a) feed them the substrate that can be metabolized into this amino acid
b) transfuse the patients with blood from unaffected donors
c) regulate the diet of the affected persons to severely limit the uptake of the amino acid
d) feed the patients the missing enzymes in a regular cycle, such as twice per week
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