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Transcription
Define the following
 Messenger
RNA
 Ribosomal RNA
 Transfer RNA
 Transcription
 Codon
Morse Code
Genes and Proteins
 Read
on pg. 294 what role proteins
play
 How
does DNA factor in?
RNA
3
chemical differences between DNA
and RNA
 1. Single strand
 2. Sugar in RNA is ribose
 3. Uracil (U) instead of thymine (T)
 “U R single”
Three types of RNA
 Messenger
RNA (mRNA)
 Ribosomal
RNA (rRNA)
 Transfer
RNA (tRNA)
Messenger RNA (mRNA)
 RNA that
transports information from
DNA in the nucleus to the cell's
cytoplasm
Ribosomal RNA (rRNA)
 RNA that
makes up the ribosomes;
 Clamps onto mRNA and
 Uses it’s information to assemble
amino acids in the correct order
Transfer RNA (tRNA)
 RNA that
transports amino acids to
the ribosomes to be assembled into
proteins
Transcription
 Process
in the cell nucleus where
enzymes make an RNA copy of a
DNA strand
 1. Enzymes unzip the molecule of
DNA
 2. RNA nucleotides pair with
complementary DNA nucleotides on a
DNA strand
Transcription cont…

AGC TAA CCG

UCG AUU GGC

GACAAGTCCACAATC

CUGUUCAGGUGUUAG
Transcription cont…
 3.
mRNA molecule breaks away as
the DNA strands rejoin
 mRNA leaves the nucleus and enters
the cytoplasm
Page 297
Page 297
Amino Acids
The Genetic Code
4
nitrogen bases make up 20 amino
acids (64 combos)
 This is the genetic code
 Separated into codons
 Set of three nitrogen bases that
codes for an amino acid