DNA Synthesis - PowerPoint PPT Presentation

1 / 22
About This Presentation
Title:

DNA Synthesis

Description:

DNA Synthesis Chapters 16 &17 Nucleotide structure 3 components 1. 5 carbon sugar (ribose) 2. Phosphate 3. Nitrogenous base Dehydration synthesis 5 to 3 ... – PowerPoint PPT presentation

Number of Views:35
Avg rating:3.0/5.0
Slides: 23
Provided by: Lancas62
Category:

less

Transcript and Presenter's Notes

Title: DNA Synthesis


1
DNA Synthesis
  • Chapters 16 17

2
Nucleotide structure
  • 3 components
  • 1. 5 carbon sugar (ribose)
  • 2. Phosphate
  • 3. Nitrogenous base

3
Dehydration synthesis
  • 5 to 3
  • Phosphate (5C) binds with the hydroxyl group
    (3C)
  • Removes water
  • Phosphodiester bond
  • Bond links 2 sugars of nucleotides

4
(No Transcript)
5
Double Helix
  • Two strands held together
  • A forms 2 hydrogen bonds with T
  • G forms 3 hydrogen bonds with C

6
Duplication
  • Semiconservative replication
  • Old strand template
  • DNA has one old one new strand

7
Duplication
  • Leading side
  • Continuous strand in the 5 to 3 direction
  • Lagging strand
  • Side that is duplicated in short segments
  • Okazaki fragments
  • Short stretches on the lagging side

8
Duplication
  • DNA Polymerases
  • Lengthens by adding new nucleotides
  • DNA primase
  • Forms primer to start replication

9
Duplication
  • DNA helicase
  • Opens helix in front of the polymerase
  • DNA gyrase
  • Releases strain on the molecule
  • DNA ligase
  • Bonds Okazaki fragments

10
Duplication
  • Replication fork
  • Site of opening of the DNA
  • Site of active replication

11
Stages of replication
  • Initiation
  • Elongation
  • Termination

12
Protein synthesis
  • DNA RNA protein
  • Transcription Translation

13
(No Transcript)
14
RNA
  • rRNA ribosomal RNA
  • Site where polypeptides are assembled
  • tRNA transfer RNA (anti-codon)
  • Transport aa for building polypeptides
  • mRNA messenger RNA (codon)
  • Transcribes the information
  • Directs which aa are assembled

15
Ribosomes
16
Transcription
  • Nucleus
  • Initiation
  • Promoter
  • RNA polymerase
  • Elongation
  • Termination
  • Stop signal (hair pin)

17
Transcription
18
Translation
  • Cytoplasm in eukaryotes
  • 1. Initiation
  • 2. Elongation
  • 3. Termination

19
Translation
20
Translation
21
Eukaryotes
22
Protein synthesis
Write a Comment
User Comments (0)
About PowerShow.com