1. CENTRAL DOGMA

2. The flow of genetic information
from DNA to RNA to protein
Initially, the central dogma of biology was simply thought
of as
DNA  mRNA protein

4. What do all those nitrogenous
bases mean?
 On the RNA strand,
each bracket contains
3 nucleotides.
 3 nucleotides are
called a codon, each
codon represents an
amino acid.
 There are 64 (43)
possible code words
which is more than
enough to code for
the 20 amino acids

5. DNA Transcription
 Transcription occurs in the nucleus of the
cell.
 The gene sequence is copied into
messenger RNA (mRNA).
 mRNA has 4 nucleotide bases like DNA, but
instead of Thymine (T) it has Uracil (U).
 Transcription produces a single strand of
mRNA.

6. DNA Transcription
mRNA strand

7. DNA Transcription
The completed mRNA
strand leaves the nucleus
via a nuclear pore and
goes into the cytoplasm.