Test Bank for Essentials of Medical Genetics for
Nursing and Health Professionals 1st Edition
McClary / All Chapters 1 - 27 / Full Complete
2023
Chapter 1-3: Foundations of Genetics
1. A nurse is explaining the structure of DNA to a patient. Which of the following components
form the backbone of the DNA double helix?
A. Nitrogenous bases
B. Hydrogen bonds
C. Phosphate groups and deoxyribose sugars
D. Adenine and guanine
Correct Answer: C
Rationale: The backbone of the DNA double helix is composed of alternating phosphate
groups and deoxyribose sugars. The nitrogenous bases (A, T, C, G) are attached to the sugar and
form the rungs of the ladder, held together by hydrogen bonds.
2. Which of the following statements accurately describes the process of transcription?
A. It occurs in the cytoplasm and produces a protein.
B. It involves the synthesis of an mRNA strand from a DNA template.
C. It requires the enzyme DNA polymerase.
D. It results in two identical DNA molecules.
Correct Answer: B
Rationale: Transcription is the process of synthesizing a messenger RNA (mRNA) strand
from a DNA template. It occurs in the nucleus. Translation occurs in the cytoplasm and produces
a protein. DNA replication results in two identical DNA molecules and requires DNA polymerase.
3. A patient asks about the difference between a genotype and a phenotype. Which of the
following is the best response?
A. "Genotype is the physical appearance, and phenotype is the genetic makeup."
B. "Genotype refers to the genetic makeup, and phenotype is the observable physical or
biochemical characteristics."
C. "Genotype is only for dominant traits, and phenotype is for recessive traits."
D. "Genotype and phenotype are the same thing."
, Correct Answer: B
Rationale: Genotype refers to the specific allele composition of an individual (e.g., AA, Aa,
aa). Phenotype is the observable expression of that genotype (e.g., brown eyes, blue eyes).
4. Which of the following is an example of a frameshift mutation?
A. A single nucleotide is substituted with another.
B. A single nucleotide is inserted into the DNA sequence.
C. A segment of DNA is inverted.
D. A codon is changed to a stop codon.
Correct Answer: B
Rationale: A frameshift mutation occurs when the addition or deletion of a nucleotide
changes the reading frame of the codons downstream. A substitution (A) is a point mutation. An
inversion (C) is a chromosomal rearrangement. A nonsense mutation (D) creates a stop codon.
5. SATA: Which of the following are considered pyrimidine bases in DNA? (Select all that
apply.)
A. Adenine
B. Cytosine
C. Guanine
D. Thymine
E. Uracil
Correct Answers: B, D
Rationale: The pyrimidine bases in DNA are cytosine and thymine. Adenine and guanine are
purines. Uracil is a pyrimidine found in RNA, not DNA.
6. During which phase of the cell cycle does DNA replication occur?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Correct Answer: B
Rationale: DNA replication occurs during the S (synthesis) phase of interphase. The G1 and
G2 phases are gap phases for growth and preparation. The M phase is for mitosis.
7. A nurse is teaching a patient about the role of RNA. Which type of RNA carries the genetic
code from the nucleus to the ribosome?
A. Ribosomal RNA (rRNA)
B. Transfer RNA (tRNA)
,C. Messenger RNA (mRNA)
D. Small nuclear RNA (snRNA)
Correct Answer: C
Rationale: Messenger RNA (mRNA) transcribes the genetic code from DNA in the nucleus
and carries it to the ribosomes in the cytoplasm for protein synthesis.
8. What is the term for the specific location of a gene on a chromosome?
A. Allele
B. Locus
C. Genome
D. Karyotype
Correct Answer: B
Rationale: A locus is the specific physical location of a gene or DNA sequence on a
chromosome. An allele is a variant form of a gene.
9. Which of the following best describes a codon?
A. A sequence of three nucleotides that codes for a single amino acid.
B. The entire sequence of a gene.
C. A protein that regulates gene expression.
D. A type of chromosomal mutation.
Correct Answer: A
Rationale: A codon is a sequence of three nucleotides (a triplet) in mRNA that specifies a
particular amino acid or a stop signal during protein synthesis.
10. A patient has a karyotype reported as 46,XY. What does this indicate?
A. A female with a normal chromosome count.
B. A male with a normal chromosome count.
C. A male with Down syndrome.
D. A female with Turner syndrome.
Correct Answer: B
Rationale: 46,XY is the normal karyotype for a male. 46 means there are 46 chromosomes,
and XY indicates the presence of an X and a Y sex chromosome.
11. SATA: Which of the following are components of a nucleotide? (Select all that apply.)
A. A phosphate group
B. A deoxyribose sugar
C. An amino acid
, D. A nitrogenous base
E. A lipid molecule
Correct Answers: A, B, D
Rationale: A nucleotide, the building block of DNA, consists of three parts: a phosphate
group, a deoxyribose sugar, and a nitrogenous base. Amino acids are the building blocks of
proteins.
12. The process by which a single gene can produce multiple different proteins is known as:
A. Mutation
B. Alternative splicing
C. Translation
D. Replication
Correct Answer: B
Rationale: Alternative splicing is a regulated process during gene expression that results in a
single gene coding for multiple proteins. Exons can be included or excluded from the final mRNA
transcript.
13. A nurse is discussing the Human Genome Project. What was the primary goal of this
project?
A. To create a map of all human genes.
B. To determine the sequence of the entire human genome.
C. To develop gene therapy for all genetic diseases.
D. To create a database of all human mutations.
Correct Answer: B
Rationale: The primary goal of the Human Genome Project was to determine the complete
sequence of the human genome and identify all the genes it contains.
14. Which of the following is an example of a purine base?
A. Thymine
B. Cytosine
C. Adenine
D. Uracil
Correct Answer: C
Rationale: Adenine and guanine are purines. Thymine, cytosine, and uracil are pyrimidines.
15. What is the name of the enzyme responsible for unwinding the DNA double helix during
replication?
Nursing and Health Professionals 1st Edition
McClary / All Chapters 1 - 27 / Full Complete
2023
Chapter 1-3: Foundations of Genetics
1. A nurse is explaining the structure of DNA to a patient. Which of the following components
form the backbone of the DNA double helix?
A. Nitrogenous bases
B. Hydrogen bonds
C. Phosphate groups and deoxyribose sugars
D. Adenine and guanine
Correct Answer: C
Rationale: The backbone of the DNA double helix is composed of alternating phosphate
groups and deoxyribose sugars. The nitrogenous bases (A, T, C, G) are attached to the sugar and
form the rungs of the ladder, held together by hydrogen bonds.
2. Which of the following statements accurately describes the process of transcription?
A. It occurs in the cytoplasm and produces a protein.
B. It involves the synthesis of an mRNA strand from a DNA template.
C. It requires the enzyme DNA polymerase.
D. It results in two identical DNA molecules.
Correct Answer: B
Rationale: Transcription is the process of synthesizing a messenger RNA (mRNA) strand
from a DNA template. It occurs in the nucleus. Translation occurs in the cytoplasm and produces
a protein. DNA replication results in two identical DNA molecules and requires DNA polymerase.
3. A patient asks about the difference between a genotype and a phenotype. Which of the
following is the best response?
A. "Genotype is the physical appearance, and phenotype is the genetic makeup."
B. "Genotype refers to the genetic makeup, and phenotype is the observable physical or
biochemical characteristics."
C. "Genotype is only for dominant traits, and phenotype is for recessive traits."
D. "Genotype and phenotype are the same thing."
, Correct Answer: B
Rationale: Genotype refers to the specific allele composition of an individual (e.g., AA, Aa,
aa). Phenotype is the observable expression of that genotype (e.g., brown eyes, blue eyes).
4. Which of the following is an example of a frameshift mutation?
A. A single nucleotide is substituted with another.
B. A single nucleotide is inserted into the DNA sequence.
C. A segment of DNA is inverted.
D. A codon is changed to a stop codon.
Correct Answer: B
Rationale: A frameshift mutation occurs when the addition or deletion of a nucleotide
changes the reading frame of the codons downstream. A substitution (A) is a point mutation. An
inversion (C) is a chromosomal rearrangement. A nonsense mutation (D) creates a stop codon.
5. SATA: Which of the following are considered pyrimidine bases in DNA? (Select all that
apply.)
A. Adenine
B. Cytosine
C. Guanine
D. Thymine
E. Uracil
Correct Answers: B, D
Rationale: The pyrimidine bases in DNA are cytosine and thymine. Adenine and guanine are
purines. Uracil is a pyrimidine found in RNA, not DNA.
6. During which phase of the cell cycle does DNA replication occur?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Correct Answer: B
Rationale: DNA replication occurs during the S (synthesis) phase of interphase. The G1 and
G2 phases are gap phases for growth and preparation. The M phase is for mitosis.
7. A nurse is teaching a patient about the role of RNA. Which type of RNA carries the genetic
code from the nucleus to the ribosome?
A. Ribosomal RNA (rRNA)
B. Transfer RNA (tRNA)
,C. Messenger RNA (mRNA)
D. Small nuclear RNA (snRNA)
Correct Answer: C
Rationale: Messenger RNA (mRNA) transcribes the genetic code from DNA in the nucleus
and carries it to the ribosomes in the cytoplasm for protein synthesis.
8. What is the term for the specific location of a gene on a chromosome?
A. Allele
B. Locus
C. Genome
D. Karyotype
Correct Answer: B
Rationale: A locus is the specific physical location of a gene or DNA sequence on a
chromosome. An allele is a variant form of a gene.
9. Which of the following best describes a codon?
A. A sequence of three nucleotides that codes for a single amino acid.
B. The entire sequence of a gene.
C. A protein that regulates gene expression.
D. A type of chromosomal mutation.
Correct Answer: A
Rationale: A codon is a sequence of three nucleotides (a triplet) in mRNA that specifies a
particular amino acid or a stop signal during protein synthesis.
10. A patient has a karyotype reported as 46,XY. What does this indicate?
A. A female with a normal chromosome count.
B. A male with a normal chromosome count.
C. A male with Down syndrome.
D. A female with Turner syndrome.
Correct Answer: B
Rationale: 46,XY is the normal karyotype for a male. 46 means there are 46 chromosomes,
and XY indicates the presence of an X and a Y sex chromosome.
11. SATA: Which of the following are components of a nucleotide? (Select all that apply.)
A. A phosphate group
B. A deoxyribose sugar
C. An amino acid
, D. A nitrogenous base
E. A lipid molecule
Correct Answers: A, B, D
Rationale: A nucleotide, the building block of DNA, consists of three parts: a phosphate
group, a deoxyribose sugar, and a nitrogenous base. Amino acids are the building blocks of
proteins.
12. The process by which a single gene can produce multiple different proteins is known as:
A. Mutation
B. Alternative splicing
C. Translation
D. Replication
Correct Answer: B
Rationale: Alternative splicing is a regulated process during gene expression that results in a
single gene coding for multiple proteins. Exons can be included or excluded from the final mRNA
transcript.
13. A nurse is discussing the Human Genome Project. What was the primary goal of this
project?
A. To create a map of all human genes.
B. To determine the sequence of the entire human genome.
C. To develop gene therapy for all genetic diseases.
D. To create a database of all human mutations.
Correct Answer: B
Rationale: The primary goal of the Human Genome Project was to determine the complete
sequence of the human genome and identify all the genes it contains.
14. Which of the following is an example of a purine base?
A. Thymine
B. Cytosine
C. Adenine
D. Uracil
Correct Answer: C
Rationale: Adenine and guanine are purines. Thymine, cytosine, and uracil are pyrimidines.
15. What is the name of the enzyme responsible for unwinding the DNA double helix during
replication?
