1). Watson & Crick  proposed double helix structure in 1953.

    2). information gathered  X-ray diffraction studies from Rosalind Franklin.

         1).  DNA is made:    

 2). There are only 4 DNA nucleotides.

        3).  bond only with a specific complimentary nucleotide

    thus:

CYTOSINE-GUANINE

       4) form double helix

    1). The chromatin DNA helices unwinds.

    2).  DNA molecule separates 

    3).  template for creating a new strand.

4). nucleotides line up next to old ones (complementary base pairing)

        5). DNA polymerase.

        6). 2 new strands of DNA

             complementary pairing:

3). Types of RNA

i). Ribosomal RNA (rRNA)

 ii). Messenger RNA (mRNA)

iii). Transfer RNA (tRNA)

1). Definitions

gene:

triplet: 3 base codes of DNA

codon: 3 base codes of mRNA 

anticodon: 3 base pairs of tRNA

intron

exon

i). The helix is unwound

ii). The complimentary RNA bases

3). The mRNA travels to the cytoplasm to a ribosome

4). Translation

i).  mRNA binds to the ribosome

ii). tRNA that holds a specific amino acid binds the ribosome and a polypeptide chain is released.

iii). Complementary base pairs (anticodons) in the tRNA bind to the mRNA (codons).

 

URACIL : ADENINE

ADENINE: URACIL

GUANINE : CYTOSINE

CYTOSINE : GUANINE