Page 168 - MNU microbiology theoritical 2025

General Microbiology & Immunology (PM 401) Second level Semester 4 2024/2025

DNA Facts

• Chromosomes are made of DNA

• Deoxyribonucleic Acid (DNA) is the molecule that stores genetic information in

cells

• DNA is often called the blueprint of life.

.
Function of DNA

• DNA is responsible for carrying and transmitting the hereditary materials

or the genetic instructions from parents to offsprings.

• DNA also plays an important role in the production of proteins

DNA Structure

• DNA consists of two long chains (two strands) that twist around

each other, forming a double helix

• Each strand consists of repeating nucleotides

• The backbone of DNA strand consists of alternating phosphate and

deoxyribose sugar

• A nucleotide: The basic building blocks of DNA in a DNA chain consists

of

1. A nitrogenous base

2. A Phosphate Group

3. Sugar (deoxyribose)

General Microbiology & Immunology (PM 401) theoretical handbook Page 157