CHEM 210 Biochemistry Module 6 Exam (2026–2027) | PortageLearning | Verified Questions and Answers with Detailed Rationales |Comprehensive Module 6 Study Guide | Latest Update with complete solution

CHEM 210 Biochemistry
CHEM 210 Biochemistry Module 6 Exam (2026–2027) | Portage

Learning | Verified Questions and Answers with Detailed Rationales |

Comprehensive Module 6 Study Guide | Latest Update with complete

solution

Gradegurus




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,Question 1

In DNA, the pair (D) ___ is held together by 3 hydrogen bonds.
A) nucleotides
B) cytosine, thymine, and uracil
C) 2-deoxyribose
D) cytosine and guanine

Correct answer: D
Rationale: Guanine (G) and cytosine (C) form three hydrogen bonds with each other.
Adenine–thymine (A–T) forms only two.




Question 2

In RNA, cytosine always pairs with:
A) thymine
B) adenine
C) guanine
D) adenosine

Correct answer: C
Rationale: In both DNA and RNA, cytosine (C) pairs with guanine (G) via three hydrogen
bonds.




Question 3

Which of the following is a second messenger in cells?
A) FAD

, B) cAMP
C) AMP
D) dATP
E) UTP

Correct answer: B
Rationale: Cyclic AMP (cAMP) is a well-known second messenger that relays signals
from cell-surface receptors to target molecules inside the cell.




Question 4

DNA is built from which of the following?
A) nucleosides
B) genes
C) purines
D) nucleotides
E) codons

Correct answer: D
Rationale: Nucleotides are the monomeric building blocks of nucleic acids (DNA and
RNA).




Question 5

(Image of a single ring with two nitrogens – a pyrimidine base)
Identify the structure.
A) uracil
B) thymine (DNA)
C) adenine (purine)
D) cytosine (pyrimidine)

Correct answer: B (thymine)
Rationale: The image shows a single-ring pyrimidine with a methyl group – that is
thymine (found in DNA).