WGU BIO C190 PRETEST questions with verified
answers
Ans✓✓✓-Levels of organization
(Citric Acid Cycle) Ans✓✓✓-Krebs Cycle
A biological polymer consists of 358 amino acids linked together covalently. What
is this polymer?
A carbohydrate
A protein
A lipid
A nucleic acid Ans✓✓✓-protein
A cell has divided its chromosomes into two new nuclei. The cytoskeleton of the
cell is currently pinching the cell in the middle to form two new cells. In which
stage of the cell cycle is this cell? Ans✓✓✓-Cytokinesis
A cell undergoing meiosis is currently dividing. The two new daughter cells will be
haploid, but the DNA they contain is still replicated. The homologous
chromosomes have separated and are ready to start the second division, but they
have not yet begun the second round of division. Which stage of the cell cycle is
this cell in? Ans✓✓✓-Telophase 1
A cutting is taken from a mature hydrangea plant with blue flowers. The cutting is
planted in acidic soil and produces red flowers. What caused the flower color in
this hydrangea cutting to change?
1. The complete dominance at the allele coding for flower color
,2. The size of the cutting
3. The unique genes present in the cutting
4. An interaction between the genes and the soil Ans✓✓✓-4
A dog breeder mates two black Labrador retriever dogs. The breeder is surprised
by the offspring produced by this crossing. In addition to offspring with beautiful
black coats, there are dogs with brown, gray, and tan coats. Which form of
inheritance is this an example of? Ans✓✓✓-polygenic inheritance
A fly is heterozygous for wing length, carrying one allele for the dominant long-
winged appearance and one allele for the recessive short-winged appearance.
Which percentage of the fly's gametes will carry the short-winged allele?
1. 25%
2. 50%
3. 75%
4. 100% Ans✓✓✓-2.
A gardener maintains a species of rose that produce either yellow flowers (the
dominant phenotype) or white flowers (the recessive phenotype). One day, the
gardener observes that a cross between two yellow rose bushes has led to a
single rose bush with orange flowers.
What evolutionary mechanism is involved in the change in the gene pool of this
species? Ans✓✓✓-Mutation
A gene contains the sequence CGCATACGGTAC that results in the amino acid
sequence arg-ile-arg-tyr. A mutated version of this gene has an A in place of the
second C and produces the amino acid sequence arg-ile-arg-tyr. What is true
regarding this mutation?
, 1. The mutated gene results in the same amino acid sequence and will result in
the same phenotype.
2. The mutated results are the same amino acid sequence as the original, but the
change in the gene sequence will result in a different phenotype.
3. The mutated gene is similar, but not identical, and can result in a different
phenotype.
4. The change of a single amino acid cannot result in a different phenotype.
Ans✓✓✓-1
A molecular bond results from an electron being transferred from one atom to
another. Which type of bond holds these atoms together? Ans✓✓✓-Ionic
A molecule consists of a chain of glucose monomers linked together. What is the
function of this molecule within the cell?
To store genetic information
To catalyze chemical reactions
To transport materials
To store energy Ans✓✓✓-To store energy
A plastic water bottle is filled with water and placed in the freezer. The next day
the frozen water has expanded, causing the plastic bottle to rupture. Which
characteristic of water is this an example of? Ans✓✓✓-Density
A recessive mutation in the DFN3 gene causes deafness. A mother with DFN3
deafness will have sons who all have deafness. How did the sons inherit the gene
for deafness?
answers
Ans✓✓✓-Levels of organization
(Citric Acid Cycle) Ans✓✓✓-Krebs Cycle
A biological polymer consists of 358 amino acids linked together covalently. What
is this polymer?
A carbohydrate
A protein
A lipid
A nucleic acid Ans✓✓✓-protein
A cell has divided its chromosomes into two new nuclei. The cytoskeleton of the
cell is currently pinching the cell in the middle to form two new cells. In which
stage of the cell cycle is this cell? Ans✓✓✓-Cytokinesis
A cell undergoing meiosis is currently dividing. The two new daughter cells will be
haploid, but the DNA they contain is still replicated. The homologous
chromosomes have separated and are ready to start the second division, but they
have not yet begun the second round of division. Which stage of the cell cycle is
this cell in? Ans✓✓✓-Telophase 1
A cutting is taken from a mature hydrangea plant with blue flowers. The cutting is
planted in acidic soil and produces red flowers. What caused the flower color in
this hydrangea cutting to change?
1. The complete dominance at the allele coding for flower color
,2. The size of the cutting
3. The unique genes present in the cutting
4. An interaction between the genes and the soil Ans✓✓✓-4
A dog breeder mates two black Labrador retriever dogs. The breeder is surprised
by the offspring produced by this crossing. In addition to offspring with beautiful
black coats, there are dogs with brown, gray, and tan coats. Which form of
inheritance is this an example of? Ans✓✓✓-polygenic inheritance
A fly is heterozygous for wing length, carrying one allele for the dominant long-
winged appearance and one allele for the recessive short-winged appearance.
Which percentage of the fly's gametes will carry the short-winged allele?
1. 25%
2. 50%
3. 75%
4. 100% Ans✓✓✓-2.
A gardener maintains a species of rose that produce either yellow flowers (the
dominant phenotype) or white flowers (the recessive phenotype). One day, the
gardener observes that a cross between two yellow rose bushes has led to a
single rose bush with orange flowers.
What evolutionary mechanism is involved in the change in the gene pool of this
species? Ans✓✓✓-Mutation
A gene contains the sequence CGCATACGGTAC that results in the amino acid
sequence arg-ile-arg-tyr. A mutated version of this gene has an A in place of the
second C and produces the amino acid sequence arg-ile-arg-tyr. What is true
regarding this mutation?
, 1. The mutated gene results in the same amino acid sequence and will result in
the same phenotype.
2. The mutated results are the same amino acid sequence as the original, but the
change in the gene sequence will result in a different phenotype.
3. The mutated gene is similar, but not identical, and can result in a different
phenotype.
4. The change of a single amino acid cannot result in a different phenotype.
Ans✓✓✓-1
A molecular bond results from an electron being transferred from one atom to
another. Which type of bond holds these atoms together? Ans✓✓✓-Ionic
A molecule consists of a chain of glucose monomers linked together. What is the
function of this molecule within the cell?
To store genetic information
To catalyze chemical reactions
To transport materials
To store energy Ans✓✓✓-To store energy
A plastic water bottle is filled with water and placed in the freezer. The next day
the frozen water has expanded, causing the plastic bottle to rupture. Which
characteristic of water is this an example of? Ans✓✓✓-Density
A recessive mutation in the DFN3 gene causes deafness. A mother with DFN3
deafness will have sons who all have deafness. How did the sons inherit the gene
for deafness?
