Download DNA RNA DNA RNA Short Answer 1. How many codons code for

PROTEIN SYNTHESIS PRACTICE
Name
Per
1. Use your amino acid chart to decode the amino acid sequence for the following mRNA strand. (Group the mRNA into codons.)
mRNA:
A U G A G C C C C U A C A C G U A A
amino acid sequence:
2. The process you used to complete number one is called ____________________
3. Using the following strand of DNA find its (not so) hidden amino acid sequence.
(Hint: you need to play the role of RNA polymerase and convert the DNA into mRNA, then complete translation.)
DNA: T A C G T G A A C C T T T T G A C C A T C
mRNA:
amino acid sequence:
4. Comparing DNA and RNA: Carefully read each term or phrase in the left-hand column of the following table. If the term or
phrase applies to DNA, place a check mark in the column labeled DNA. If it applies to RNA, place a check mark in the column
labeled RNA. If it applies to both nucleic acids, place a check mark in both columns.
DNA
RNA
Made of nucleotides
Deoxyribose
Ribose
Uracil
Thymine
Sugar contains one less oxygen
DNA
RNA
Does not leave nucleus
Transcription
Messenger
More than one type
Found in nucleus
Leaves nucleus
5. Use your amino acid chart to complete the following table. The first column has been completed to help you get started.
Amino acid
tRNA anticodon
mRNA codon
DNA
Phenylalanine
AAA
UUU
AAA
Glycine
Methionine (start)
Valine
GGA
GTC
GUG
GAT
True/False
1. __ Some amino acids are coded by more than one codon.
2. __ All amino acids are coded by more than one codon.
3. __ Proteins can start with any amino acid.
4. __ Codons are located on the mRNA.
5. __ Only one codon indicates the end of a protein.
6. __ Anticodons neutralize codons so they cannot function properly.
7. __ Only one codon indicates the start of a protein.
8. __ When multiple codons code for the same amino acid, the first two bases of the codon are ususally the same.
9. __ The STOP codons are UAA, UGA, and UAG.
10. __ The AUG codon indicates the start of a protein.
Short Answer
1. How many codons code for the amino acid ARGININE? ____
2. What is the mRNA sequence that codes for the peptide: MET, ARG, LYS, SER, STOP
3. Is there only one possible RNA sequence for number 2 above? ________
4. Use the amino acid circle chart in your text book on p303 to find the amino acid that has mRNA codon: UGC
Amino Acid =_________________
5. Now try using the small square amino acid chart you got during class to look up the same mRNA codon: UGC, do
you get the same amino acid or different? __________________
6. Approximately how many RNA nucleotides are needed to code for a protein that is 50 amino acids long? ______
7. Approximately how many codons are needed to build a protein that is 120 amino acids long? _____
8. How many peptide bonds are found in a hemoglobin polypeptide that is 146 amino acids long? ______