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Biology: Protein Synthesis, Extra Credit
Name:
Place these events in the correct order defining protein synthesis.
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
Ribosome moves along mRNA to enclose new codon
Two mRNA codons are exposed to the larger ribosomal sub-unit
Hydrogen bonds between complementary base pairs of DNA break
The tRNA molecule carrying the first amino acid binds by its complimentary anticodon to the first
codon
RNA Nucleotides are attached to the DNA strand according to the rules of base pairing
RNA Polymerase binds to single stranded DNA
tRNA breaks away from polypeptide chain
Messenger RNA molecules leave the nucleus via nuclear pores
Histone coat protecting the DNA double helix in the region of the cistron is stripped away
Several ribosomes become attached to a molecule of RNA
Polypeptide chain assumes secondary, tertiary or quaternary structure
Amino Acids become attached to specific transfer RNA molecules
Peptide bonds form between adjacent amino acids
Double helix of DNA unwinds
Polypeptide chain leaves ribosome
Answers:
Step # Letter
1.
2.
3.
4.
5.
6.
7.
Event
i Histone coat protecting the DNA double helix in the region of the cistron is stripped away
c Hydrogen bonds between complementary base pairs of DNA break
n Double helix of DNA unwinds
f RNA Polymerase binds to single stranded DNA
e RNA Nucleotides are attached to the DNA strand according to the rules of base pairing
h Messenger RNA molecules leave the nucleus via nuclear pores
l (Amino Acids become attached to specific transfer RNA molecules)- this occurs all the time as
free amino acid and free tRNA become available.
8. d The tRNA molecule carrying the first amino acid binds by its complimentary anticodon
to the first codon
9. b Two mRNA codons are exposed to the larger ribosomal sub-unit
10. m Peptide bonds form between adjacent amino acids
11. a Ribosome moves along mRNA to enclose new codon
12. g tRNA breaks away from polypeptide chain
13. j Several ribosomes become attached to a molecule of RNA
14. o Polypeptide chain leaves ribosome
15. k Polypeptide chain assumes secondary, tertiary or quaternary structure