the building blocks
Download
Skip this Video
Download Presentation
The Building Blocks

Loading in 2 Seconds...

play fullscreen
1 / 26

The Building Blocks - PowerPoint PPT Presentation


  • 123 Views
  • Uploaded on

The Building Blocks. 3.3 Nucleic Acids. HELIXHELIX. Nucleic Acids. Information storage. Nucleic Acids. Function: store & transmit hereditary information Examples: RNA (ribonucleic acid) DNA (deoxyribonucleic acid) Structure: monomers = nucleotides. Nucleotides. 3 parts

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' The Building Blocks' - shamus


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
the building blocks
The Building Blocks
  • 3.3 Nucleic Acids
nucleic acids
Nucleic Acids

Informationstorage

nucleic acids1
Nucleic Acids
  • Function:
    • store & transmit hereditary information
  • Examples:
    • RNA (ribonucleic acid)
    • DNA (deoxyribonucleic acid)
  • Structure:
    • monomers = nucleotides
nucleotides
Nucleotides
  • 3 parts
    • nitrogen base (C-N ring)
    • pentose sugar (5C)
      • ribose in RNA
      • deoxyribose in DNA
    • phosphate(PO4)group

Are nucleic acidscharged molecules?

rna dna
RNA & DNA
  • RNA
    • single nucleotide chain
  • DNA
    • double nucleotide chain
      • N bases bond in pairs across chains
    • spiraled in a double helix
      • double helix 1st proposed as structure of DNA in 1953 by James Watson & Francis Crick(just celebrated 50th anniversary in 2003!)
types of nucleotides
Types of nucleotides
  • 2 types of nucleotides
    • different nitrogen bases
    • purines
      • double ring N base
      • adenine (A)
      • guanine (G)
    • pyrimidines
      • single ring N base
      • cytosine (C)
      • thymine (T)
      • uracil (U)
nucleic polymer
Nucleic polymer
  • Backbone
    • sugar to PO4 bond
    • phosphodiester bond
      • new base added to sugar of previous base
      • polymer grows in one direction
    • N bases hang off the sugar-phosphate backbone

Dangling bases?Why is this important?

pairing of nucleotides
Pairing of nucleotides
  • Nucleotides bond between DNA strands
    • H bonds
    • purine :: pyrimidine
    • A :: T
      • 2 H bonds
    • G :: C
      • 3 H bonds

Matching bases?Why is this important?

information polymer
Information polymer
  • Function
    • series of bases encodes information
      • like the letters of a book
    • stored information is passed from parent to offspring
      • need to copy accurately
    • stored information = genes
      • genetic information

Passing on information?Why is this important?

slide12

T

G

A

C

T

A

C

A

G

G

A

T

C

dna molecule
DNA molecule
  • Double helix
    • H bonds between bases join the 2 strands
      • A :: T
      • C :: G

H bonds?Why is this important?

copying dna
Copying DNA
  • Replication
    • 2 strands of DNA helix are complementary
      • have one, can build other
      • have one, can rebuild the whole

Matching halves?Why is this a good system?

when does a cell copy dna
When does a cell copy DNA?
  • When in the life of a cell does DNA have to be copied?
    • cell reproduction
      • mitosis
    • gamete production
      • meiosis
dna replication
DNA replication

“It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material.”

James Watson

Francis Crick

1953

interesting note
Interesting note…
  • Ratio of A-T::G-C affects stability of DNA molecule
    • 2 H bonds vs. 3 H bonds
    • biotech procedures
      • more G-C = need higher T° to separate strands
    • high T° organisms
      • many G-C
    • parasites
      • many A-T (don’t know why)
another interesting note
Another interesting note…
  • ATPAdenosine triphosphate
  • modified nucleotide
    • adenine (AMP) + Pi + Pi

+

+

carbohydrates
Carbohydrates
  • Structure / monomer
    • monosaccharide
  • Function
    • energy
    • raw materials
    • energy storage
    • structural compounds
  • Examples
    • glucose, starch, cellulose, glycogen

glycosidic bond

lipids
Lipids
  • Structure / building block
    • glycerol, fatty acid, cholesterol, H-C chains
  • Function
    • energy storage
    • membranes
    • hormones
  • Examples
    • fat, phospholipids, steroids

ester bond (in a fat)

proteins
Proteins
  • Structure / monomer
    • amino acids
    • levels of structure
  • Function
    • enzymes u defense
    • transport u structure
    • signals u receptors
  • Examples
    • digestive enzymes, membrane channels, insulin hormone, actin

peptide bond

nucleic acids2
Nucleic acids
  • Structure / monomer
    • nucleotide
  • Function
    • information storage & transfer
  • Examples
    • DNA, RNA

phosphodiester bond

ad