Replicación del ADN. RESUMEN Fácil!. Pregunta de Examen de Selectividad. Biología 2 Bachillerato.

**SUMMARY OF THE DNA REPLICATION PROCESS: Replication begins with the opening of the DNA strands to be replicated: HELICASE breaks hydrogen bonds between strands. TOPOISOMERASES and GYRASES release tension. SSB proteins stabilize the strands. An RNA polymerase (primase) synthesizes a primer that provides a 3'OH end to DNA polymerases, which add new nucleotides by forming phosphodiester bonds. DNA POLYMERASES add nucleotides and synthesize new strands. One strand is synthesized continuously (leading strand). The other strand is synthesized discontinuously (Okazaki fragments). When the polymerase removes the RNA primers and replaces DNA, the DNA ligase enzyme joins the fragments. **CHARACTERISTICS OF REPLICATION. DNA replication is: 1) SEMICONSERVATIVE. New DNA molecules have one strand from the original molecule and another newly synthesized strand. 2) BIDIRECTIONAL. It occurs in two directions. 3) SEMIDISCONTINUOUS. One of the strands is synthesized in pieces (Okazaki fragments). Video Moments: 00:00 Components of a Replication Fork. 05:00 SUMMARY of DNA Replication. Enzymes. 08:55 Characteristics of DNA Replication. --------------------------------------------------------------------------------------------------------------------------------------------- This video provides a solution to an exercise from the Galicia 2022 university entrance exam, extraordinary session.