1 / 7

DNA Replication

DNA Replication. W atch this video to see how DNA replication actually occurs. http://www.youtube.com/watch?v=hfZ8o9D1tus. DNA Replication.

uttara
Download Presentation

DNA Replication

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DNA Replication

  2. Watch this video to see how DNA replication actually occurs. • http://www.youtube.com/watch?v=hfZ8o9D1tus

  3. DNA Replication • During DNA replication, the DNA molecule (double helix) separates into two strands. Next, two new complementary strands are produced by following the rules of base-pairing. • Base-pairing – principle that bonds in DNA can form only between adenine and thymine and between guanine and cytosine A --- T G --- C

  4. DNA Replication • DNA replication is carried out by a series of enzymes. These enzymes “unzip” the double-helix by breaking the hydrogen bonds that exists between the base pairs. Once the original strands are unwound, each strand serves as a template for the attachment of complementary bases.

  5. DNA Replication • The enzyme, DNA polymerase, is the principal enzyme involved in DNA replication. DNA polymerase polymerizes (“reads” and attaches) individual nucleotides to the template DNA strand. DNA polymerase also “proofreads” each new DNA strand, ensuring that the correct nucleotides were attached.

  6. DNA Replication • In most prokaryotes, DNA replication begins at a single location. Alternatively, eukaryotic chromosomes replicate in multiple locations simultaneously. In both cases, replication proceeds in both directions until the chromosome is completely copied. The sites where separation and replication occur are called replication forks.

  7. DNA Replication electron micrograph images of real chromosomes undergoing replication

More Related