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UNE BIOCHEMISTRY EXAM WEEK 1 QUESTIONS AND ANSWERS
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UNE BIOCHEMISTRY EXAM WEEK 1QUESTIONS AND ANSWERS
fundamental structure is the linear sequence of amino acids in a polypeptide
chain.
amino terminus (N-terminus) to carboxyl terminus (C-terminus) - The
fundamental structures are written from the ______________ to the
______________.
The sorts of secondary structures include alpha helices, beta pleated sheets, and
bends/turns/loops.
The alpha helix (secondary structure) is generated when the carbonyl group of
one peptide bond establishes a hydrogen connection with the amide nitrogen of
another peptide bond four amino acids along the polypeptide chain.
The peptide backbone is made up of hydrogen bonds (alpha helix structure).
This unique bonding sequence produces a structure that is both compact and
rigid.
Alpha helices make up around a third of all secondary structures.
Proline and "kink" - ANSWER ____ is not normally present in these structures
because it creates a non-traditional peptide bond and adds a "___" to the helix.
Beta sheets are created when beta strands are linked laterally (e.g.). - ANSWER
are produced when _______ strands are joined laterally by at least two or three
backbone hydrogen bonds.
, ANSWER: The beta strands are joined horizontally by ___________ bonds
produced between the C=O groups of either strand and the _____ groups of
either strand.
R groups - ANSWER the ________ always protrude to the top or bottom.
hydrophilic and hydrophobic side - ANSWER Depending on the R groups on
the beta's sides, the sheet could have a ________ and a _________ side.
exposed on the protein's surface to the polar H2O solvent - ANSWER For beta-
pleated sheets with two sides, where and to what will the hydrophilic side be
exposed?
will be buried in the protein and rarely exposed to the polar H2O solvent -
ANSWER: For beta pleated sheets with two sides, where will the hydrophobic
side be? Has it ever been exposed to the H2O solvent?
supersecondary structures - ANSWER Tertiary structures are also known as
what?
Tertia-ry structure is the overall 3D shape of a polypeptide chain, including
interactions between alpha-helices, beta-sheets, and any other loops, turns, or
bends.
bends, turns, or loops - ANSWER: Short stretches/areas of the polypeptide
chain generate these structures that are stabilized by hydrogen bonding.
Rossman fold - ANSWER Give an example of a tertiary structure.
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