* Rungs of the ladder: These are made of nitrogenous bases (adenine, thymine, guanine, and cytosine), which pair up specifically (A with T, G with C) like puzzle pieces.

* Sides of the ladder: These are made of alternating sugar (deoxyribose) and phosphate molecules. These form the backbone of the helix.

Key features:

* Double-stranded: Two strands of DNA wind around each other.

* Antiparallel: The two strands run in opposite directions.

* Right-handed: The helix twists to the right.

* Major and minor grooves: The helix has alternating larger and smaller grooves that allow proteins to bind and interact with the DNA.

Visual Representation:

* Model kits: You can find physical models to help visualize the structure.

* Illustrations: Search online for images of the DNA double helix.

* 3D software: Some programs allow you to explore the structure in 3D.

Understanding the double helix is crucial for understanding how DNA stores and transmits genetic information.