Codons

What happens after
Transcription?

★Once in the ribosomes, the tRNA
pairs up with the rRNA – ribosomal
RNA - which takes the message from
the mRNA and translates it from
nucleotide language into amino acids.
These amino acids bond together and
become proteins.

★Transcription creates mRNA –
messenger RNA - which sends
messages from DNA to the cytoplasm
and to the ribosomes.

★The tRNA – transfer RNA - helps to
transfer the mRNA to the ribosomes,
but does so only 3 codons at a time.

direction

Match

Match the following

• Transcription

• Translation

• mRNA

Nucleus

Ribosome

Nucleus, Cytoplasm & Ribosomes

• Nucleus

• Ribosome

• Nucleus, Cytoplasm & Ribosomes

Translating RNA into an

Amino Acid

1.

You receive a DNA message.
a.

For example, ATA

2.

You transcribe it into RNA
a.

The ATA changes to UAU

3.

You translate it into a protein. To do this
with the wheel:
a.

Start at the center and find the big U

b.

Then, move out to the next layer and
find the A

c.Then, move out to the next layer and
find the next U

d.

Finally, move to the outside and locate
the amino acid, which we call Tyr
(short for Tyrosine)

Directions: Use the codon chart to answer the questions below.

Question: Translate the codons provided into
amino acids.

Codon

Amino Acid

CCC

CAG

UAC

GGG

AUU

Match

Match the following

• UUU
• UAG

• AUG

• GUG

• UGG

Phenyl-alanine

Stop

Methionine (Start)

Valine

Tryptophan

• Phenyl-alanine
• Stop

• Methionine (Start)

• Valine

• Tryptophan

Reorder

Reorder the following amino acids if given this mRNA strand:

AUG UCC CCA CUC UAA

• Methionine

• Serine

• Proline

• Leucine

• Stop

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Multiple Choice

What amino acid is represented by the codon UUA?

• Phenylalanine

• Tyrosine

• Leucine

• Stop codon

Multiple Choice

mRNA: UUA CAG GUA

Use the codon chart to determine the second amino acid.

• Methionine (MET)

• Leucine (LEU)

• Glutamine (GLN)