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Chromosomes (article) | Cell cycle | Khan Academy
https://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/a/dna-and-chromosomes-article
Web ResultImage of a cell undergoing DNA replication (all the chromosomes in the nucleus are copied) and chromosome condensation (all the chromosomes become compact). In the first image, there are four decondensed, stringy chromosomes in the nucleus of the cell. After DNA replication, each chromosome now consists of two …
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Chromatid - National Human Genome Research Institute
https://www.genome.gov/genetics-glossary/Chromatid
Web Result5 days ago · Definition. A chromatid is one of the two identical halves of a chromosome that has been replicated in preparation for cell division. The two “sister” chromatids are joined at a constricted region of …
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9.2: DNA Replication - Biology LibreTexts
https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Concepts_in_Biology_(OpenStax)/09%3A_Molecular_Biology/9.02%3A_DNA_Replication
Web ResultMar 17, 2022 · Escherichia coli has 4.6 million base pairs in a single circular chromosome, and all of it gets replicated in approximately 42 minutes, starting from a single origin of replication and proceeding around the chromosome in both directions. This means that approximately 1000 nucleotides are added per second.
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Chromosome Replication - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/chromosome-replication
Web ResultIn almost all bacteria, chromosome replication is initiated by the DnaA protein, with the only exceptions belonging to the endosymbiont group [118]. Originally, DnaA was identified in E. coli by isolation of conditional mutants that specifically affected initiation of chromosome replication (for review see [20,21] ).
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8.4: Chromosomes and Chromatin - Biology LibreTexts
https://bio.libretexts.org/Bookshelves/Biochemistry/Fundamentals_of_Biochemistry_(Jakubowski_and_Flatt)/01%3A_Unit_I-_Structure_and_Catalysis/08%3A_Nucleotides_and_Nucleic_Acids/8.04%3A_Chromosomes_and_Chromatin
Web ResultJul 13, 2023 · Before typical cell division (mitosis), these chromosomes are replicated by DNA polymerase to make two identical chromosomes, one for each future daughter cell. The two identical chromosomes, called sister chromatids , bind to each other at a common structure called the centromere .
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Molecular mechanism of DNA replication (article) | Khan Academy
https://www.khanacademy.org/science/ap-biology/gene-expression-and-regulation/replication/a/molecular-mechanism-of-dna-replication
Web ResultThe double-stranded DNA of the circular bacteria chromosome is opened at the origin of replication, forming a replication bubble. Each end of the bubble is a replication fork, a Y-shaped junction where double-stranded DNA is separated into two single strands.
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9.2 DNA Replication - Concepts of Biology | OpenStax
https://openstax.org/books/concepts-biology/pages/9-2-dna-replication
Web ResultThere are multiple origins of replication on the eukaryotic chromosome, such that replication can occur simultaneously from several places in the genome. During elongation, an enzyme called DNA polymerase adds DNA nucleotides to the 3' end of the template.
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Chromosomes Fact Sheet - National Human Genome Research …
https://www.genome.gov/about-genomics/fact-sheets/Chromosomes-Fact-Sheet
Web ResultAug 15, 2020 · Females have two X chromosomes in their cells, while males have one X and one Y chromosome. Inheriting too many or not enough copies of sex chromosomes can lead to serious problems. For example, females who have extra copies of the X chromosome are usually taller than average and some have …
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DNA Replication - National Human Genome Research Institute
https://www.genome.gov/genetics-glossary/DNA-Replication
Web Result4 days ago · At the end of this process, once the DNA is all replicated, the cell actually has twice the amount of DNA that it needs, and the cell can then divide and parcel this DNA into the daughter cell, so that the daughter cell and the parental cell in many case are absolutely genetically identical. ... Chromosome …
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The Initiation and Completion of DNA Replication in Chromosomes
https://www.ncbi.nlm.nih.gov/books/NBK26826/
Web ResultThe Initiation and Completion of DNA Replication in Chromosomes. We have seen how a set of replication proteins rapidly and accurately generates two daughter DNA double helices behind a moving replication fork.
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