Self Quiz for the Polypeptide and Protein Synthesis: Translation

Study the material in this section and then write out the answers to these question.
Do not just click on the answers and write them out. This will not test your understanding of this tutorial.

1. Define translation. (ans)

2. Match the following with their role in translation.

_____ A series of three tRNA bases complementary to a mRNA codon. (ans)
_____ The ribozyme that forms peptide bonds between amino acids during translation. (ans)
_____ The ribosomal subunit that binds to mRNA to form the initiation complex. (ans)
_____ The ribosomal site where an aminoacyl-tRNA first attaches during translation. (ans)
_____ The ribosomal site where the growing amino acid chain is temporarily being held by a tRNA as the next codon in the mRNA is being read. (ans)
_____ A complex of an amino acid and a tRNA molecule. (ans)
_____ The sequence of bases on mRNA to which a 30S or 40S ribosomal subunit first attaches. (ans)
_____ A series of three mRNA bases coding for no amino acid and thus terminates the protein chain: UAA, UAG, UGA. (ans)
_____ A complex consisting of a 30S or 40S ribosomal subunit, a tRNA having the anticodon UAC and carrying an altered form of the amino acid methionine (N-formylmethionine or f-Met), and proteins called initiation factors. (ans)
_____ A three-dimensional, inverted cloverleaf-shaped molecule about 70 nucleotides long to which a specific amino acid can be attached; transports amino acids to the ribosome during translation. (ans)

a. 30S or 40S ribosomal subunit
b. ribosome binding site
c. initiation complex
d. 50S or 60S ribosomal subunit
e. tRNA
f. aminoacyl-tRNA
g. anticodon
h. P-site of ribosome
i. A-site of ribosome
j. peptidyl transferase
k. nonsense (stop) codon
l. release factors
m. start cocon

3. What amino acid sequence would the DNA base sequence AAAGAGCCT code for? Hint: see Fig. 2. (ans)


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