UNE BIOCHEM 1005 WEEK 1 QUESTIONS WITH COMPLETE SOLUTIONS
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Course
CHEM 1005
Institution
University Of New England (UNE
)
What are the four different protein structures? correct answer: 1. Primary
2. Secondary
3. Tertiary
4. Quaternary
What is the primary structure of a protein? correct answer: a linear sequence of amino acids in polypeptide chains which is written from the amino terminus (N-terminus) to the c...
une biochem 1005 week 1 questions with complete so
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University of New England (UNE
)
CHEM 1005
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UNE BIOCHEM 1005 WEEK 1 QUESTIONS
WITH COMPLETE SOLUTIONS
What are the four different protein structures? correct answer:
1. Primary
2. Secondary
3. Tertiary
4. Quaternary
What is the primary structure of a protein? correct answer: a
linear sequence of amino acids in polypeptide chains which is
written from the amino terminus (N-terminus) to the carboxyl
terminus (C-terminus)
What is the secondary structure made of? correct answer: a-
helix, b-sheets, and bends, turns, or loops
How are alpha helices formed? correct answer: They are formed
when the carbonyl group of peptide bonds form a hydrogen
bond with the amide hydrogen located 4 residues down the
chain.
Approximately how much of all secondary structures are a-
helices? correct answer: 1/3
What is not typically found in secondary structures and why?
correct answer: Proline, because it forms a non-traditional
peptide bond and adds a "kink" in the helix
, How are beta sheets formed? correct answer: They are formed
when beta strands are connected laterally by at least two or three
backbone hydrogen bonds
How are the b-strands connected and and by what? correct
answer: They are horizontally by hydrogen bonds formed
between C=O groups of either strand and NH groups of either
strand
B-sheets can either be _____________ or _________________.
correct answer: parallel or anti-parallel
Where does the R group always protrude to? correct answer:
The top or bottom
Depending on the R groups on the sides of the B-sheet, the sheet
may have a ________________ and a ________________ side.
correct answer: hydrophilic and hydrophobic
Where will the hydrophilic side of the sheet be? correct answer:
on the surface of the protein and be exposed to the polar H2O
solvent.
Where will the hydrophobic side of the sheet be? correct answer:
It will be buried in the protein and will only rarely be exposed to
the polar H2O solvent.
What are bends, turns, or loops? correct answer: Short stretched
areas of the polypeptide chain from these structures that are
stabilized by hydrogen bonds (these are not random)
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