Download Worksheet 13.2

Biology Honors I!
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Name ___________________ Period ___
Worksheet 13.2: Ribosomes & Protein Synthesis
(pages 366-371; iBooks pages 621-629)
1. Proteins are made by joining _____________________ into long called
polypeptides.
2. How can only four bases in RNA carry instructions for 20 different amino acids?
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3. What is a codon? _____________________________________________________
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4. Which letter represents the number of possible three-base codes? _____________
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A. 4! !
B. 12! !
C. 64! !
D. 128
5. ________ True or False. All amino acids are specified by only one codon.
6. What is the start codon? __________ What does it code for? ________________
7. What is a polypeptide? ________________________________________________
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8. Can a codon contain two of the same bases? _____________________________
9. Circle each codon in the diagram of RNA below.
A
U
G
U
C
G
A
A
C
10. List the 3 stop codons:
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Biology Honors I!
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Name ___________________ Period ___
11. Use the codon wheel to complete the table.
mRNA Code
Amino Acid
AAA
GCG
GAU
CAA
12. What two mRNA codes corresponds with histidine? ________ ________
13. How many different mRNA codes correspond to arginine? ______________
14. How many different mRNA codes correspond with methionine? ____________
15. What occurs during the process of translation?.
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16. Where in the cell does translation take place? ____________________________
17. What is an anticodon? _______________________________________________
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Biology Honors I!
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Name ___________________ Period ___
18. Number the four tRNA anticodons in the order in which they should appear to
match the codons in the mRNA strand.
mRNA
phenylalanine
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leucine
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lysine
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methionine
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19. Which anticodon matches the mRNA codon UUC? ______________
20. Which amino acid is carried by the anticodon UUU? (Hint: figure out the codon)
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Biology Honors I!
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Name ___________________ Period ___
Match the roles with the molecules. Molecules may be used more than once.
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Roles!!
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Molecules
21. _________ Master Plan
A. DNA
22. _________ Goes to the ribosomes in the cytoplasm!
B. RNA
23. _________ Blueprint
24. _________ Remains in the nucleus
25. Go to page 368 in your textbook (iBooks page 624) and list the steps of translation.
A. ____________________________
B. ____________________________
C. ____________________________
D. ____________________________
26. Many proteins are ___________________, which catalyze and regulate chemical
reactions.
27. ___________ True or False: Genes are the keys to almost everything that living
cells do.
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