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17 lut 2023 · What is DNA replication. When & where does the process occur. Learn how & why DNA is replicated. Also, learn the replication steps in order with a labeled diagram.
8 paź 2021 · During interphase (S phase) the DNA replicates to create two identical strands of DNA called chromatids, joined together by a narrow region called the centromere; The two chromatids that make up the double structure of a chromosome are known as ‘sister chromatids’
28 lut 2021 · DNA replicates in the S phase of interphase. After replication, the chromosomes are composed of two linked sister chromatids. When fully compact, the pairs of identically packed chromosomes are bound to each other by cohesin proteins. The connection between the sister chromatids is closest in a region called the centromere.
17 mar 2022 · When a cell divides, it is important that each daughter cell receives an identical copy of the DNA. This is accomplished by the process of DNA replication. The replication of DNA occurs during the synthesis phase, or S phase, of the cell cycle, before the cell enters mitosis or meiosis.
Additional replication proteins are needed to help in opening the double helix and thus provide the appropriate single-stranded DNA template for the DNA polymerase to copy. Two types of protein contribute to this process—DNA helicases and single-strand DNA-binding proteins.
After replication, each chromosome is comprised of two DNA molecules. The two halves of a replicated chromosome are called chromatids. Before a cell can divide, the entire genome must be copied, so that there is a complete set of chromosomes available to be passed to each daughter cell.
Diagram of DNA replication. A circle of double stranded DNA has a region labeled SSO near a region labeled DSO. A nick forms in DSO and DNA polymerase III begins copying and displacing the nicked strand.
