Biochem Module 6 Exam Study Guide – Practice Questions with Answers. Updated 2025/2026

Biochem Module 6 Exam Study
Guide – Practice Questions
with Answers. Updated
2025/2026



In DNA, adenine always pairs with ________.


- Thymine
- Guanine
- Uracil

- Cytosine - Ans✔✔-- Thymine


DNA is built from which of the following?


- Nucleosides
- Genes
- Purines
- Nucleotide

- Codons - Ans✔✔-- Nucleotide

, The double helix of DNA is stabilized mainly by __________.


- Ionic bonds
- Covalent bonds
- Ion-dipole bonds
- Hydrogen bonds

- Hydrogen covalent bonds - Ans✔✔-- Hydrogen bonds


Which of the following pentose sugars is a constituent of DNA?


- Xylose
- Ribitol
- 2-deoxyribose
- Arabinose

- Ribose - Ans✔✔-- 2-deoxyribose


Pyrimidines have ________ ring(s), (each) containing ______ nitrogen(s),
whereas purines have ________ ring(s), (each) containing ______ nitrogen(s).


- 1; 1; 1; 1
- 1; 2; 2; 2
- 2; 2; 1; 2
- 2; 1; 1; 2

- 2; 2; 1; 1 - Ans✔✔-- 1; 2; 2; 2