Download G19S Amino Acid code

Activity
Determining the Amino Acid from mRNA codon
Determine how the mutation in mRNA chains below will affect the amino acid sequence. Use
the genetic code to complete this exercise.
RNA Sequences
Example: UGU-CCG to UUG-CCG
Amino Acid Sequences
Cys-Pro to Cys-Pro
No change in amino acid sequence
a. –GGA-CGU to –GAU-CGU
b. –AUC-UGC to –AUC-UGG
c. –UGU-CCU-CCU to -UGU-UUC-CCU
Name___________________________________________________________
Predicting Amino Acids
Transcribe and Translate
Molecules of DNA carry the genetic instructions for protein formation. Converting
these DNA instructions into proteins requires a series of coordinated steps in transcription
and translation.
1. Complete column B by writing the correct mRNA codon for each sequence of DNA
bases listed in the column marked DNA Base Sequence. Use the letters A, U, C, or G
2. Identify the process responsible by writing its mane below the arrow in Column A.
3. Identify the process responsible by writing its name below the arrow in Column C.
4. Complete column D by writing the name of the correct amino acid that is coded by
each base sequence. Use the mRNA genetic code table to translate the mRNA base
sequences to amino acid sequences
A
B
C
D
DNA base
Process
mRNA codon
Process
Amino Acid
sequence
ATG
GGG
ATT
ATA
GTT
TTT
GCT
TAG
AAA
Analysis
1. Where within the cell:
a. are the DNA instructions located? ___________________________________
b. does transcription occur? _________________________________________
c. does translation occur? ___________________________________________
2. Describe and DRAW the structure of tRNA
3. EXPLAIN why specific base paring is essential to the process of transcription and
translation.
4. What are the start codon (sequence/s) and stop codon (sequence/s)