PROCESS DIAGRAM
V
a” c
gaS g
A G_C.
Codons
Uac
-
-
-
-
-
-
-
A _S GU A G.Ç.
A C ATC
u U 'C G 'G ^jU ^tU A.G-C
AVC
G
A ffc
*G—
]U A G C
A |
aaUcgqa 8 gUag
Step®:
Transcription
Step 2:
Translation
66 CHAPTER 3
Cells and Tissues
The___
a. DNA
b. tRNA
brings amino acids to the mRNA.
c. ribosome
d. stop codon
Key:
= Adenine
= Guanine
= Cytosine
= Uracil
T ranslation • Figure 3.19
Ribosomes, tRNA, and mRNA work together to assemble the
appropriate amino acids into a protein.
P site
Large
subunit
Initiator tRNA
A site
Small
subunit
Amino acid
Amino acid —
(methionine)
Anticodon
Large and small ribosomal subunits
join to form a functional ribosome
and initiator tRNA fits into position
on the ribosome.
Initiator tRNA
tRNA —^
P site
Anticodon
mRNA
Anticodon of incoming tRNA pairs with
next mRNA codon beside initiator tRNA.
mRNA
Small
subunit
Start codon
i Initiator tRNA attaches to a
start codon.
New
Stop codon
Protein synthesis stops when
the ribosome reaches stop
codon on mRNA.
peptide
) Amino acid on initiator tRNA
forms a peptide bond with
amino acid beside it.
mRNA
movement
tRNA leaves the ribosome; ribosome shifts by
one codon; tRNA binds to newly exposed codon;
steps
Q repeat.
mRNA
Growing
protein
in
^
^
.
Complete protein
tRNA
Summary of movement of ribosome along mRNA
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