Mutations caused by chemical and physical mutagens are classified based on how they alter the DNA sequence. The two major types of base substitution mutations are transitions and transversions. A third category, frameshift mutations, involves insertion or deletion of bases…
A chemical mutagen is any chemical substance that increases the frequency of mutations above the spontaneous background rate. Chemical mutagens act by damaging DNA in different ways — some mimic normal bases, some chemically modify existing bases, some physically insert…
Reactive Oxygen Species and DNA damage are closely linked processes in cellular biology. ROS such as superoxide, hydrogen peroxide, and hydroxyl radicals can damage DNA through oxidative stress, leading to mutations and genomic instability. Reactive Oxygen Species (ROS) are highly…
Understanding cancer requires more than studying genes—it demands insight into how cancer cells consume and utilize energy. One of the most fundamental discoveries in tumor biology is the Warburg effect, first described by Otto Warburg in 1924. Warburg observed that…
In the intricate world of molecular biology, gene expression is precisely controlled by an elaborate regulatory system.1 At the heart of this system lie enhancers—powerful DNA sequences that play a pivotal role in determining when, where, and how strongly genes…
Have you ever wondered how your body knows how to build itself—cell by cell, organ by organ? The answer lies in DNA (Deoxyribonucleic Acid). DNA is the genetic instruction manual of life. From the color of your eyes to how…
You’ve probably heard of DNA—the famous molecule that holds the instructions for life. But what is DNA actually made of? The answer is nucleotides. Think of nucleotides as tiny, powerful building blocks. They come together like Legos to form the long…
The Central Dogma of Molecular Biology is the fundamental principle that explains how genetic information flows inside cells. Biology is full of beautiful simplicity hidden within complex processes. One of the most fundamental frameworks in molecular biology is the central…