Comprehensive Study Guide:
Fundamental Molecular Biology
Curriculum Alignment: Based on Oxford University
Reading List for Medical & Biological Sciences.
Key Concepts: DNA Structure, Replication & Protein
Synthesis.
Primary Reference: Fundamental Molecular Biology by
Lizabeth A. Allison.
High-Quality Summary and Key Points Focused On The
Exam .
Chapter : three
1
, Part 1: The Chemical Foundations of Molecular Biology
1. The Hierarchy of Molecular Interactions
In Oxford exams, they focus on Why DNA is stable. The
secret is the balance of bonds:
Covalent Bonds (Strong): Phosphodiester bonds form the
"Backbone" (5' → 3' direction).
Hydrogen Bonds (Weak/Strategic): Hold the two strands
together.
A = T (2 Hydrogen bonds).
G ≡ C (3 Hydrogen bonds) → Note: G-C rich areas are
harder to melt/separate due to the triple bond.
Hydrophobic Interactions: Push the non-polar
nitrogenous bases to the inside of the helix, shielding them
from water.
2. Nucleotide Structure: The Blueprint
Every nucleotide is a "Trinity" of three components:
Pentose Sugar: (Ribose in RNA vs. Deoxyribose in DNA).
Phosphate Group: Attaches to the 5' carbon, giving DNA
its Negative Charge (crucial for Gel Electrophoresis).
3.Nitrogenous Base: Attached to the 1' carbon via a
Glycosidic Bond.
2
Fundamental Molecular Biology
Curriculum Alignment: Based on Oxford University
Reading List for Medical & Biological Sciences.
Key Concepts: DNA Structure, Replication & Protein
Synthesis.
Primary Reference: Fundamental Molecular Biology by
Lizabeth A. Allison.
High-Quality Summary and Key Points Focused On The
Exam .
Chapter : three
1
, Part 1: The Chemical Foundations of Molecular Biology
1. The Hierarchy of Molecular Interactions
In Oxford exams, they focus on Why DNA is stable. The
secret is the balance of bonds:
Covalent Bonds (Strong): Phosphodiester bonds form the
"Backbone" (5' → 3' direction).
Hydrogen Bonds (Weak/Strategic): Hold the two strands
together.
A = T (2 Hydrogen bonds).
G ≡ C (3 Hydrogen bonds) → Note: G-C rich areas are
harder to melt/separate due to the triple bond.
Hydrophobic Interactions: Push the non-polar
nitrogenous bases to the inside of the helix, shielding them
from water.
2. Nucleotide Structure: The Blueprint
Every nucleotide is a "Trinity" of three components:
Pentose Sugar: (Ribose in RNA vs. Deoxyribose in DNA).
Phosphate Group: Attaches to the 5' carbon, giving DNA
its Negative Charge (crucial for Gel Electrophoresis).
3.Nitrogenous Base: Attached to the 1' carbon via a
Glycosidic Bond.
2
