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DNA Replication
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DNA clamp
A protein that holds DNA polymerase in place during strand extension.
DNA helicase loader
A protein that assists helicase to load onto the DNA double helix at the replication fork.
Replication bubble
The region formed by two replication forks moving in opposite directions during DNA replication.
DNA gyrase
A type of topoisomerase found in bacteria that introduces negative supercoils into DNA.
Primase
Synthesizes a short RNA primer to initiate DNA synthesis.
Nucleotide excision repair
Repairs bulky lesions in DNA that distort the double helix, like those caused by UV light.
Replicative DNA polymerases
The group of DNA polymerases involved in the replication of the cellular genome.
Topoisomerase
Relieves the stress on DNA strands caused by unwinding.
DNA polymerase III
Main enzyme that adds nucleotides in a 5' to 3' direction to form a new complementary DNA strand.
DNA polymerase I
Removes RNA primers and replaces them with DNA nucleotides.
Base excision repair
Repairs small, non-helix-distorting base lesions, such as cytosine deamination.
Replication licensing factors
Proteins that ensure DNA replication occurs only once per cell cycle by regulating the assembly of the replication machinery.
PCNA (Proliferating Cell Nuclear Antigen)
The sliding clamp in eukaryotes that increases the processivity of DNA polymerases.
Pre-initiation complex
A complex of proteins that forms at the origin of replication prior to the start of DNA synthesis.
Sliding clamp loader
A protein complex that opens the sliding clamp so it can encircle DNA and then loads it onto the DNA.
Telomerase
An enzyme that adds repetitive nucleotide sequences to the ends of chromosomes, preventing their shortening during replication.
Mismatch repair
A repair system that fixes incorrectly paired nucleotides that escape proofreading by DNA polymerases.
DNA-dependent DNA polymerase
Enzyme that synthesizes a new DNA strand using an existing DNA strand as a template.
Replication fork
The Y-shaped region of a replicating DNA molecule where new strands are growing.
DNA ligase I
Specifically involved in sealing nicks during lagging strand synthesis and long-patch base excision repair.
Single-strand binding proteins (SSBs)
Bind to and stabilize single-stranded DNA until it can be used as a template.
Origin of replication
The specific sequence where DNA replication is initiated.
Flap endonuclease (FEN1)
Cleaves flap structures that can arise during DNA replication and repair.
Helicase
Unwinds the DNA double helix to separate the two strands.
Lagging strand
New complementary DNA strand synthesized in fragments (Okazaki fragments) opposite to the direction of the replication fork.
Okazaki fragments
Short fragments of DNA synthesized on the lagging strand during DNA replication.
Telomere
The repetitive nucleotide sequences at the ends of eukaryotic chromosomes, which protect the ends from degradation.
RNA-dependent DNA polymerase (Reverse transcriptase)
An enzyme that synthesizes DNA from an RNA template, used by retroviruses.
Leading strand
New complementary DNA strand synthesized continuously in the direction of the replication fork.
Ligase
Joins Okazaki fragments together to create one continuous DNA strand.
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