Regents Biology 2006-2007 Nucleic acids: Information molecules.

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2006-2007 Regents Biology Nucleic acids: Information molecules

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Transcript of Regents Biology 2006-2007 Nucleic acids: Information molecules.

Page 1: Regents Biology 2006-2007 Nucleic acids: Information molecules.

2006-2007 Regents Biology

Nucleic acids:

Information molecules

Page 2: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

Nucleic Acids Examples

DNA DeoxyriboNucleic

Acid

RNA RiboNucleic Acid

RNA

Page 3: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

DNADNA

Nucleic Acids Function:

genetic material stores information

genesblueprint for building proteins

DNA RNA proteins

transfers informationblueprint for new cellsblueprint for next generation

proteinsproteins

Page 4: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

AA

A

A

TC

G

CG

TG

C

T

Genes (DNA)are needed

to run bodies every day…to make you and me…to make new cells…

to make babies!

Page 5: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

Nucleic acids

Building block = nucleotides

5 different nucleotides different nitrogen bases A, T, C, G, U

nucleotide – nucleotide – nucleotide – nucleotide

phosphate

sugar N base

Nitrogen basesI’m the

A,T,C,G or Upart!

Page 6: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

Nucleotide chains Nucleic acids

nucleotides chained into a polymer DNA

double-sideddouble helixA, C, G, T

RNAsingle-sidedA, C, G, U

phosphate

sugar N base

phosphate

sugar N base

phosphate

sugar N base

phosphate

sugar N base

strong bonds

RNA

Page 7: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

DNA Double strand twists into a double helix

weak bonds between nitrogen bases join the 2 strands A pairs with T

A :: T C pairs with G

C :: G the two strands can

separate when our cells need to make copies of it

weak bonds

Page 8: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

Copying DNA Replication

copy DNA 2 strands of DNA helix are

complementary they are matching have one, can build other have one, can rebuild the whole

Page 9: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

Copying DNA pairing of the bases

allows each strand to serve as a pattern for a new strand

Newly copied strands of DNA

DNA replication

Page 10: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

Watson and Crick … and others…1953 | 1962

Page 11: Regents Biology 2006-2007 Nucleic acids: Information molecules.

Regents Biology

HELIXHELIXHELIXHELIX

Let’s build some

DNA!


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