DNA function & structure (with diagram) (article) | Khan Academy
Chromosomal DNA consists of two DNA polymers that make up a 3-dimensional (3D) structure called a double helix. In a double helix structure, the strands of DNA run antiparallel, meaning …
Discovery of the structure of DNA (article) | Khan Academy
The carbon atoms of the deoxyribose sugar in DNA nucleotides are labeled with numbers accompanied by prime marks. Prime marks look similar to apostrophes (e.g., 3').
DNA structure and replication review (article) | Khan Academy
Knowing the structure of DNA unlocked the door to understanding many aspects of DNA's function, such as how it is copied and how the information it carries can be used to produce …
Mode of DNA replication: Meselson-Stahl experiment
The semi-conservative model, in which each strand of DNA serves as a template to make a new, complementary strand, seemed most likely based on DNA's structure. The models were tested …
Molecular structure of DNA (video) | Khan Academy
DNA, short for deoxyribonucleic acid, consists of nucleotides forming a double helix structure. Nucleotides contain a phosphate group, deoxyribose sugar, and a nitrogenous base. The …
DNA structure (article) | Khan Academy
A video shows the three-dimensional shape of a DNA double helix. The double helix consists of two DNA strands wound around each other, with their sugar-phosphate backbones on the …
Prokaryotic cells (article) | Khan Academy
The majority of prokaryotic DNA is found in a central region of the cell called the nucleoid, and it typically consists of a single large loop called a circular chromosome.
Interphase (video) | Cell cycle | Khan Academy
In the G1 phase, the cell grows and takes in nutrients. In the S phase, the cell's DNA is replicated. Each replicated chromosome consists of two sister chromatids connected at the centromere. …
Intro to gene expression (central dogma) - Khan Academy
Summary: DNA is divided up into functional units called genes, which may specify polypeptides (proteins and protein subunits) or functional RNAs (such as tRNAs and rRNAs). Information …
Chromosomes and genes (article) | Khan Academy
DNA, or deoxyribonucleic acid, is formed through a process called DNA replication. DNA replication occurs during the cell division process known as the S phase of the cell cycle.