DNA structure and replication review (article) | Khan Academy
DNA replication occurs through the help of several enzymes. These enzymes "unzip" DNA molecules by breaking the hydrogen bonds that hold the two strands together.
Molecular mechanism of DNA replication - Khan Academy
New DNA is made by enzymes called DNA polymerases, which require a template and a primer (starter) and synthesize DNA in the 5' to 3' direction. During DNA replication, one new strand …
Mode of DNA replication: Meselson-Stahl experiment
There were three basic models for DNA replication that had been proposed by the scientific community after the discovery of DNA's structure. These models are illustrated in the diagram …
Stages of transcription: initiation, elongation & termination (article ...
The picture below shows DNA being transcribed by many RNA polymerases at the same time, each with an RNA "tail" trailing behind it. The polymerases near the start of the gene have …
Semi-conservative replication (video) | Khan Academy
Here, we focus on the Meselson-Stahl experiment, which proved DNA replication is semi-conservative. In this process, each new DNA pair consists of one old strand and one new …
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 …
Antiparallel structure of DNA strands (video) | Khan Academy
DNA structure consists of two strands, each with a backbone of alternating phosphate and sugar groups. These strands are linked by complementary nitrogenous bases, forming a ladder-like …
Transcription: an overview of DNA transcription (article) | Khan …
The main enzyme involved in transcription is RNA polymerase, which uses a single-stranded DNA template to synthesize a complementary strand of RNA. Specifically, RNA polymerase builds …
Repaso de la estructura y replicación del ADN (artículo) | Khan …
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Leading and lagging strands in DNA replication - Khan Academy
DNA replication is a precise process where DNA unwinds and splits into two strands. Each strand then serves as a template for a new DNA molecule. The leading strand is built continuously, …