DNA Structure and Function

DNA

Contributors
Christian Bien Portrait_edited.jpg

Ben Whitten

tutorial.png

one.png
What is DNA?
Slide1.jpeg

DNA stands for deoxyribonucleic acid, and at its core, it is the code for all life! The structure of DNA is further covered in another page, but it is key to know that there are four types of nitrogenous bases found in DNA. These include; 


  • Adenine (A) 

  • Thymine (T) 

  • Cytosine (C) 

  • Guanine (G) 


DNA follows a complementary base pairing rule. This is the phenomenon where adenine will always bond with thymine (A with T), and cytosine will always pair with guanine (C with G). The bonds which are formed between these bases are hydrogen bonds, where adenine and thymine have 2 hydrogen bonds and cytosine and guanine have 3 hydrogen bonds.

two.png
Where is DNA found?
Slide2.jpeg

The location of DNA varies with the type of cell. In a eukaryotic cell, DNA occurs bound to proteins in chromosomes within the nucleus. Linear DNA becomes tightly coiled to form the chromosomes. It is important to note that DNA is enclosed in a nuclear membrane to protect its interior. In a prokaryotic cell, DNA is found in an unbound circular form in the nucleoid region of the cytosol, which is not bound by a nuclear membrane. This type of DNA is found in organelles like the chloroplast and the mitochondria, and is also found in prokaryotic organisms like protists.

Topic Menu
DNA Structure
DNA Replication
Coding and Non-Coding DNA
Protein Synthesis
Proteins

Want your ATAR notes to empower over 77,000 students per year?

Logo-New-Large.png

Join the Team.
Empower Education.

three.png

Sign Up for Free to Read More 

Get instant access to all content and subscribe to our weekly email list on study tips, opportunities and other free resources. 

It only takes a minute...

Slide3.jpeg
four.png
Slide4.jpeg
five.png
Slide5.jpeg
six.png
Slide6.jpeg
157-seven.png
Slide1.jpeg
156-eight.png
Slide8.jpeg