UF DNA & Serology
Final Exam Study Set
75 Multiple-Choice Questions with Answers & Rationales
University of Florida — Forensic Biology Program
,Table of Contents
Domain 1: DNA Structure and Function
Domain 2: DNA Extraction Methods
Domain 3: PCR Theory and Optimization
Domain 4: STR Analysis
Domain 5: DNA Quantification Methods
Domain 6: Electrophoresis
Domain 7: Population Genetics and Statistics
Domain 8: Serology
Domain 9: Biological Evidence Collection and Preservation
Domain 10: Forensic DNA Interpretation
Domain 11: CODIS Database and DNA Indexing
Domain 12: Mitochondrial DNA and Y-STR Analysis
Domain 13: Quality Assurance and Accreditation Standards
, Domain 1: DNA Structure and Function
1. What type of chemical bond connects the two antiparallel strands of the DNA
double helix?
A) Covalent bonds between phosphate groups
B) Hydrogen bonds between complementary nitrogenous bases
C) Peptide bonds between amino acids
D) Ionic bonds between sugar and phosphate groups
Correct Answer: B) Hydrogen bonds between complementary nitrogenous
bases
Rationale: The DNA double helix is stabilized by hydrogen bonds between complementary
base pairs: adenine-thymine (2 H-bonds) and guanine-cytosine (3 H-bonds). Covalent
phosphodiester bonds connect nucleotides within each strand.
2. Which of the following correctly describes the structure of a nucleotide?
A) Amino acid + sugar + phosphate
B) Nitrogenous base + ribose sugar + phosphate group
C) Nitrogenous base + deoxyribose sugar + phosphate group
D) Nitrogenous base + glucose + sulfate group
Correct Answer: C) Nitrogenous base + deoxyribose sugar + phosphate group
Rationale: A deoxyribonucleotide consists of three components: a nitrogenous base (A, T,
G, or C), a deoxyribose sugar (five-carbon pentose), and a phosphate group. In RNA, the
sugar is ribose instead of deoxyribose.
3. Chargaff's rules state that in double-stranded DNA:
A) Adenine equals guanine and cytosine equals thymine
B) Adenine equals thymine and guanine equals cytosine
C) Purines always equal pyrimidines in single-stranded DNA
D) The total number of purines equals the total number of amino acids
Correct Answer: B) Adenine equals thymine and guanine equals cytosine
Rationale: Erwin Chargaff demonstrated that in any double-stranded DNA molecule, the
amount of adenine equals thymine (A=T) and the amount of guanine equals cytosine
(G=C). This base-pairing rule was fundamental to Watson and Crick's model.
4. DNA is described as antiparallel. What does this mean?
Final Exam Study Set
75 Multiple-Choice Questions with Answers & Rationales
University of Florida — Forensic Biology Program
,Table of Contents
Domain 1: DNA Structure and Function
Domain 2: DNA Extraction Methods
Domain 3: PCR Theory and Optimization
Domain 4: STR Analysis
Domain 5: DNA Quantification Methods
Domain 6: Electrophoresis
Domain 7: Population Genetics and Statistics
Domain 8: Serology
Domain 9: Biological Evidence Collection and Preservation
Domain 10: Forensic DNA Interpretation
Domain 11: CODIS Database and DNA Indexing
Domain 12: Mitochondrial DNA and Y-STR Analysis
Domain 13: Quality Assurance and Accreditation Standards
, Domain 1: DNA Structure and Function
1. What type of chemical bond connects the two antiparallel strands of the DNA
double helix?
A) Covalent bonds between phosphate groups
B) Hydrogen bonds between complementary nitrogenous bases
C) Peptide bonds between amino acids
D) Ionic bonds between sugar and phosphate groups
Correct Answer: B) Hydrogen bonds between complementary nitrogenous
bases
Rationale: The DNA double helix is stabilized by hydrogen bonds between complementary
base pairs: adenine-thymine (2 H-bonds) and guanine-cytosine (3 H-bonds). Covalent
phosphodiester bonds connect nucleotides within each strand.
2. Which of the following correctly describes the structure of a nucleotide?
A) Amino acid + sugar + phosphate
B) Nitrogenous base + ribose sugar + phosphate group
C) Nitrogenous base + deoxyribose sugar + phosphate group
D) Nitrogenous base + glucose + sulfate group
Correct Answer: C) Nitrogenous base + deoxyribose sugar + phosphate group
Rationale: A deoxyribonucleotide consists of three components: a nitrogenous base (A, T,
G, or C), a deoxyribose sugar (five-carbon pentose), and a phosphate group. In RNA, the
sugar is ribose instead of deoxyribose.
3. Chargaff's rules state that in double-stranded DNA:
A) Adenine equals guanine and cytosine equals thymine
B) Adenine equals thymine and guanine equals cytosine
C) Purines always equal pyrimidines in single-stranded DNA
D) The total number of purines equals the total number of amino acids
Correct Answer: B) Adenine equals thymine and guanine equals cytosine
Rationale: Erwin Chargaff demonstrated that in any double-stranded DNA molecule, the
amount of adenine equals thymine (A=T) and the amount of guanine equals cytosine
(G=C). This base-pairing rule was fundamental to Watson and Crick's model.
4. DNA is described as antiparallel. What does this mean?
