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FREEProteinStructureBiochemistryHomeworkPage-1

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Name:
Class:
Date:
Protein Folding and Protein Structure
Examine the diagrams and fill in the letter in each blank below. Some blanks have more than one letter answer.
Then answer the two questions below.
A
B
M E P K L I T F T S F S Q
D
C
E
______ 1. primary structure
______ 2. secondary structure
______ 3. tertiary structure
______ 4. quaternary structure
______ 5. held together primarily with
hydrogen bonds
______ 6. held together primarily through
R group interactions
______ 7. consists only of the sequence of
amino acids
______ 8. contains more than one
polypeptide subunit
______ 9. contains more than one helix,
sheet, or other simple structure
______ 10. beta strand (sheet)
______ 11. alpha helix
______ 12. globular shape
Folded
Normal Temperature
Range
Unfolded
Folded
13. In the picture above, one color is used for the amino
acids with hydrophilic R groups and one color is used to
show amino acids with hydrophobic R groups. Which color
is which? How do you know?
14. When a protein is exposed to temperatures outside
its normal range, it “denatures”. What does “denature”
mean? Explain your answer below.
_________________________________________________________
_________________________________________________________
_________________________________________________________
_________________________________________________________
_________________________________________________________
_________________________________________________________
(C) Bethany Lau 2016
Name: Answer Key
Class:
Date:
Protein Folding and Protein Structure
Examine the diagrams and fill in the letter in each blank below. Some blanks have more than one letter answer.
Then answer the two questions below.
A
B
M E P K L I T F T S F S Q
D
C
E
A
______
1. primary structure
B,C 2. secondary structure
______
D
______
3. tertiary structure
E
______
4. quaternary structure
B,C 5. held together primarily with
______
hydrogen bonds
D 6. held together primarily through
______
R group interactions
A
______
7. consists only of the sequence of
amino acids
E
______
8. contains more than one
polypeptide subunit
D,E 9. contains more than one helix,
______
sheet, or other simple structure
B
______ 10. beta strand (sheet)
C
______
11. alpha helix
D
______
12. globular shape
Folded
Normal Temperature
Range
Unfolded
Folded
13. In the picture above, one color is used for the amino
acids with hydrophilic R groups and one color is used to
show amino acids with hydrophobic R groups. Which color
is which? How do you know?
14. When a protein is exposed to temperatures outside
its normal range, it “denatures”. What does “denature”
mean? Explain your answer below.
In the diagram, the black colored amino acids are the
_________________________________________________________
Denaturation means the polypeptide unfolds or changes
_________________________________________________________
from its normal shape. In the picture, the normally
polypeptide, away from the water molecules surrounding
_________________________________________________________
the polypeptide.
folded protein is shown at the top. But when the
_________________________________________________________
temperature drops too low or the temperature goes too
hydrophobic ones. They fold into the inside of the folded
_________________________________________________________
(C) Bethany Lau 2016
high, the protein unfolds or folds in a different way from
_________________________________________________________
its normal shape needed for function.
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