Geneva College
LANIF · 012 DOIB
1848
G Department of Biology
★ ★
EST. 1848
P R O C H R I S T O E T P AT R I A
BIOD 210 — Genetics Final Examination
M O L E CU L A R G E N E T I CS , D N A R E P L I C AT I O N , T RA N S C R I PT I O N & M E N D E L I A N
I N H E R I TA N C E
INSTITUTION Geneva College PROGRAM Bachelor of Science in Biology
COURSE CODE BIOD 210 COURSE TITLE Genetics
ACADEMIC YEAR EXAM TITLE Final Examination — 100% Solved
| Already Graded A+
TOTAL QUESTIONS 151 Questions FORMAT Multiple Choice — Select the
Single Best Answer
EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question.
▸ Topics: DNA/RNA structure, nucleotide chemistry, DNA replication, transcription, translation, Mendelian
genetics, gene regulation, mutations, and chromosomal inheritance.
▸ All content derived from BIOD 210 Genetics curriculum at Geneva College.
▸ Correct answers and detailed rationales appear below each question for comprehensive board review.
SECTION I — NUCLEOTIDES, DNA STRUCTURE,
Questions 1 – 151
REPLICATION & MENDELIAN GENETICS
,1. A nucleotide is made up of which three components?
A. Amino group, carboxyl group, and R-group
B. Phosphate group, pentose sugar, and a nitrogenous base
C. Ribose sugar, phosphate group, and a fatty acid
D. Deoxyribose sugar, amino group, and a nitrogenous base
CORRECT ANSWER B — Phosphate group, pentose sugar, and a nitrogenous base
RATIONALE A nucleotide consists of three components: a phosphate group, a pentose sugar
(deoxyribose in DNA or ribose in RNA), and a nitrogenous base. This is the
fundamental building block of nucleic acids. A nucleoside has only two
components (sugar + base, no phosphate). Amino acids have amino groups,
carboxyl groups, and R-groups — they are protein building blocks, not nucleotide
components.
2. Which nitrogenous bases are classified as purines?
A. Cytosine and Thymine
B. Adenine and Guanine
C. Thymine and Uracil
D. Cytosine and Uracil
CORRECT ANSWER B — Adenine and Guanine
RATIONALE Adenine (A) and Guanine (G) are purines — characterized by a double-ring
structure. Cytosine (C), Thymine (T), and Uracil (U) are pyrimidines with a single-
ring structure. This structural distinction is fundamental to understanding DNA
base pairing and nucleotide chemistry.
,3. Which nitrogenous bases are classified as pyrimidines?
A. Adenine and Guanine
B. Adenine and Thymine
C. Cytosine, Thymine, and Uracil
D. Guanine and Cytosine
CORRECT ANSWER C — Cytosine, Thymine, and Uracil
RATIONALE Cytosine (C), Thymine (T), and Uracil (U) are pyrimidines — single-ring
nitrogenous bases. Thymine is found in DNA, while Uracil replaces Thymine in
RNA. Adenine and Guanine are purines (double-ring structures).
4. How can purines be structurally differentiated from pyrimidines?
A. Purines are single-ringed while pyrimidines are double-ringed
B. Purines are double-ringed while pyrimidines are single-ringed
C. Purines contain uracil while pyrimidines contain thymine
D. Purines are found only in RNA while pyrimidines are found only in DNA
CORRECT ANSWER B — Purines are double-ringed while pyrimidines are single-ringed
RATIONALE The key structural distinction is that purines (Adenine and Guanine) have a
double-ring structure, while pyrimidines (Cytosine, Thymine, Uracil) have a
single-ring structure. This structural difference determines how bases pair in the
DNA double helix — a purine always pairs with a pyrimidine.
, 5. What are the key differences between DNA and RNA?
A. DNA is single-stranded with ribose sugar; RNA is double-stranded with deoxyribose sugar
B. DNA is double-stranded with deoxyribose sugar and bases A,T,G,C; RNA is single-stranded
with ribose sugar and bases A,U,G,C
C. DNA and RNA are structurally identical but have different bases
D. DNA contains uracil while RNA contains thymine
CORRECT ANSWER B — DNA is double-stranded with deoxyribose sugar and bases A,T,G,C; RNA
is single-stranded with ribose sugar and bases A,U,G,C
RATIONALE DNA is double-stranded, has deoxyribose sugar (lacking an -OH group at the 2'
carbon), and uses A, T, G, C. RNA is single-stranded, has ribose sugar (with the -OH
group at the 2' carbon), and uses Uracil instead of Thymine.
6. What is the difference between a nucleoside and a nucleotide?
A. A nucleoside contains a phosphate group; a nucleotide does not
B. A nucleoside is pentose sugar + nitrogenous base; a nucleotide is pentose sugar +
nitrogenous base + phosphate group
C. A nucleoside is found in DNA; a nucleotide is found in RNA
D. There is no difference — the terms are synonymous
CORRECT ANSWER B — A nucleoside is pentose sugar + nitrogenous base; a nucleotide is
pentose sugar + nitrogenous base + phosphate group
RATIONALE A nucleoside consists of two components: a pentose sugar bonded to a
nitrogenous base. A nucleotide adds a third component — one or more phosphate
groups attached to the 5' carbon. Nucleotides are the monomers that polymerize
to form nucleic acids.
LANIF · 012 DOIB
1848
G Department of Biology
★ ★
EST. 1848
P R O C H R I S T O E T P AT R I A
BIOD 210 — Genetics Final Examination
M O L E CU L A R G E N E T I CS , D N A R E P L I C AT I O N , T RA N S C R I PT I O N & M E N D E L I A N
I N H E R I TA N C E
INSTITUTION Geneva College PROGRAM Bachelor of Science in Biology
COURSE CODE BIOD 210 COURSE TITLE Genetics
ACADEMIC YEAR EXAM TITLE Final Examination — 100% Solved
| Already Graded A+
TOTAL QUESTIONS 151 Questions FORMAT Multiple Choice — Select the
Single Best Answer
EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question.
▸ Topics: DNA/RNA structure, nucleotide chemistry, DNA replication, transcription, translation, Mendelian
genetics, gene regulation, mutations, and chromosomal inheritance.
▸ All content derived from BIOD 210 Genetics curriculum at Geneva College.
▸ Correct answers and detailed rationales appear below each question for comprehensive board review.
SECTION I — NUCLEOTIDES, DNA STRUCTURE,
Questions 1 – 151
REPLICATION & MENDELIAN GENETICS
,1. A nucleotide is made up of which three components?
A. Amino group, carboxyl group, and R-group
B. Phosphate group, pentose sugar, and a nitrogenous base
C. Ribose sugar, phosphate group, and a fatty acid
D. Deoxyribose sugar, amino group, and a nitrogenous base
CORRECT ANSWER B — Phosphate group, pentose sugar, and a nitrogenous base
RATIONALE A nucleotide consists of three components: a phosphate group, a pentose sugar
(deoxyribose in DNA or ribose in RNA), and a nitrogenous base. This is the
fundamental building block of nucleic acids. A nucleoside has only two
components (sugar + base, no phosphate). Amino acids have amino groups,
carboxyl groups, and R-groups — they are protein building blocks, not nucleotide
components.
2. Which nitrogenous bases are classified as purines?
A. Cytosine and Thymine
B. Adenine and Guanine
C. Thymine and Uracil
D. Cytosine and Uracil
CORRECT ANSWER B — Adenine and Guanine
RATIONALE Adenine (A) and Guanine (G) are purines — characterized by a double-ring
structure. Cytosine (C), Thymine (T), and Uracil (U) are pyrimidines with a single-
ring structure. This structural distinction is fundamental to understanding DNA
base pairing and nucleotide chemistry.
,3. Which nitrogenous bases are classified as pyrimidines?
A. Adenine and Guanine
B. Adenine and Thymine
C. Cytosine, Thymine, and Uracil
D. Guanine and Cytosine
CORRECT ANSWER C — Cytosine, Thymine, and Uracil
RATIONALE Cytosine (C), Thymine (T), and Uracil (U) are pyrimidines — single-ring
nitrogenous bases. Thymine is found in DNA, while Uracil replaces Thymine in
RNA. Adenine and Guanine are purines (double-ring structures).
4. How can purines be structurally differentiated from pyrimidines?
A. Purines are single-ringed while pyrimidines are double-ringed
B. Purines are double-ringed while pyrimidines are single-ringed
C. Purines contain uracil while pyrimidines contain thymine
D. Purines are found only in RNA while pyrimidines are found only in DNA
CORRECT ANSWER B — Purines are double-ringed while pyrimidines are single-ringed
RATIONALE The key structural distinction is that purines (Adenine and Guanine) have a
double-ring structure, while pyrimidines (Cytosine, Thymine, Uracil) have a
single-ring structure. This structural difference determines how bases pair in the
DNA double helix — a purine always pairs with a pyrimidine.
, 5. What are the key differences between DNA and RNA?
A. DNA is single-stranded with ribose sugar; RNA is double-stranded with deoxyribose sugar
B. DNA is double-stranded with deoxyribose sugar and bases A,T,G,C; RNA is single-stranded
with ribose sugar and bases A,U,G,C
C. DNA and RNA are structurally identical but have different bases
D. DNA contains uracil while RNA contains thymine
CORRECT ANSWER B — DNA is double-stranded with deoxyribose sugar and bases A,T,G,C; RNA
is single-stranded with ribose sugar and bases A,U,G,C
RATIONALE DNA is double-stranded, has deoxyribose sugar (lacking an -OH group at the 2'
carbon), and uses A, T, G, C. RNA is single-stranded, has ribose sugar (with the -OH
group at the 2' carbon), and uses Uracil instead of Thymine.
6. What is the difference between a nucleoside and a nucleotide?
A. A nucleoside contains a phosphate group; a nucleotide does not
B. A nucleoside is pentose sugar + nitrogenous base; a nucleotide is pentose sugar +
nitrogenous base + phosphate group
C. A nucleoside is found in DNA; a nucleotide is found in RNA
D. There is no difference — the terms are synonymous
CORRECT ANSWER B — A nucleoside is pentose sugar + nitrogenous base; a nucleotide is
pentose sugar + nitrogenous base + phosphate group
RATIONALE A nucleoside consists of two components: a pentose sugar bonded to a
nitrogenous base. A nucleotide adds a third component — one or more phosphate
groups attached to the 5' carbon. Nucleotides are the monomers that polymerize
to form nucleic acids.
