Biotechnology Protein Review Page 2
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311. What is the difference between introns and exons?
12. What is meant by antisense strand of DNA and the sense strand of DNA?
13.
a) What is the purpose of the mRNA “start” codon? What is the start codon? ___________
b) What is the purpose of the 3 mRNA “stop” codons?
c). List these stop codons. _________________________________
14. Explain the statement: “There is redundancy in the genetic code, but no ambiguity.” Provide an
example to illustrate your explanation.
15. Using your “genetic map” chart, fill in the following table:
DNA triplet
mRNA codon
tRNA Anticodon
Amino Acid
GGG
GAA
Lysine
AGC
Leucine
16. Complete the chart below summarizing the changes made to a pre-mRNA molecule in eukaryotes.
mRNA end
Description of
Function #1
Function #2
modification
5’ end
3’ end
17. On the transfer RNA (tRNA) diagram to the
right, label the anticodon and site of
Amino acid attachment.
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