
Molecular mechanism of DNA replication - Khan Academy
One of the key molecules in DNA replication is the enzyme DNA polymerase. DNA polymerases are responsible for synthesizing DNA: they add nucleotides one by one to the growing DNA chain, …
DNA proofreading and repair (article) | Khan Academy
DNA polymerases are the enzymes that build DNA in cells. During DNA replication (copying), most DNA polymerases can “check their work” with each base that they add.
Polymerase chain reaction (PCR) (article) | Khan Academy
Like DNA replication in an organism, PCR requires a DNA polymerase enzyme that makes new strands of DNA, using existing strands as templates. The DNA polymerase typically used in PCR is called …
Polymerase chain reaction (PCR) (video) | Khan Academy
PCR (Polymerase Chain Reaction) is a vital technique in molecular biology, enabling researchers to amplify specific DNA fragments exponentially. Essential for cloning, forensics, and medical …
Stages of transcription: initiation, elongation & termination (article ...
To begin transcribing a gene, RNA polymerase binds to the DNA of the gene at a region called the promoter. Basically, the promoter tells the polymerase where to "sit down" on the DNA and begin …
Transcription: an overview of DNA transcription (article) | Khan Academy
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 an …
Telomeres and telomerase (article) | Khan Academy
Once the 3′ end of the lagging strand template is sufficiently elongated, DNA polymerase adds the complementary nucleotides to the ends of the chromosomes; thus, the ends of the chromosomes are …
Leading and lagging strands in DNA replication - Khan Academy
On the leading strand, DNA polymerase catalyzes the continuous synthesis of DNA in the 5' to 3' direction. However, on the lagging strand, DNA synthesis occurs in short fragments called Okazaki …
DNA structure and replication review (article) | Khan Academy
The primary enzyme involved in this is DNA polymerase which joins nucleotides to synthesize the new complementary strand. DNA polymerase also proofreads each new DNA strand to make sure that …
DNA replication (article) | Khan Academy
DNA polymerase is the enzyme responsible for synthesizing new DNA. To do this, DNA polymerase moves along a template strand and adds complementary nucleotides one at a time to a growing DNA …