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Okazaki fragments

AP Bio_dna_replication

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DNA Replication: A Closer Look * The copying of DNA is remarkable in its speed and accuracy * More than a dozen enzymes and other proteins participate in DNA replication Getting Started * Replication begins at particular sites called origins of replication, where the two DNA strands are separated, opening up a replication ?bubble? * A eukaryotic chromosome may have hundreds or even thousands of origins of replication * Replication proceeds in both directions from each origin, until the entire molecule is copied * At the end of each replication bubble is a replication fork, a Y-shaped region where new DNA strands are elongating * Helicases are enzymes that untwist the double helix at the replication forks * Single-strand binding proteins bind to and stabilize single-stranded DNA

DNA Replication II

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DNA Replication a strand of DNA serves as a template for replication: complementary strain Meselson & Stahl use density centrifugation to determine method of replication grew bacterial in two different weights of Nitrogen media so the nitrogen bases have different weights switched media ruled out conservative replication need to separate strands to determine determined semi-conservative method is the true method replication begins at origin of replication bacterial and yeast: typically begin at high concentration of A/T point because there are only two hydrogen bonds between Adenine and Thymine whereas Guanine and Cytosine have three hydrogen bonds between them origin is 100-150 bp long 11-nucleotide core sequence of adenine and thymine and flanking adenine and thymine regions

Ch 16 AP BIOLOGY Study Guide from Biology Junction

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Chapter 16 The Molecular Basis of Inheritance Lecture Outline Overview: Life?s Operating Instructions In April 1953, James Watson and Francis Crick shook the scientific world with an elegant double-helical model for the structure of deoxyribonucleic acid, or DNA. Your genetic endowment is the DNA you inherited from your parents. Nucleic acids are unique in their ability to direct their own replication. The resemblance of offspring to their parents depends on the precise replication of DNA and its transmission from one generation to the next. It is this DNA program that directs the development of your biochemical, anatomical, physiological, and (to some extent) behavioral traits. Concept 16.1 DNA is the genetic material The search for genetic material led to DNA.
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