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BIOCHEM 4511: Dr. Wu: CH. 5-6 Mastering exam 2024 midterm
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BIOCHEM 4511: Dr. Wu: CH. 5-6 Mastering exam 2024 midterm
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BIOCHEM 4511: Dr. Wu: CH. 5 -6 Mastering exam 2024 midterm In considering protein secondary structure which of the following is INCORRECT? - ANSWER -The 310 helix is right -handed and often contains proline residues The amino acid side chain residues in an α helix point ________ away from the center of the helix. - ANSWER -Outward __________ between amide protons and carbonyl oxygens is necessary to stabilize a regular folding of protein secondary structure. - ANSWER -Hydrogen Bonding A ________ plot describes which structures in a polypeptide are sterically possible and which are not based on the angles of rotation about the backbone Namide -Cα and C α-Ccarbonyl bonds. - ANSWER -
Ramachandran Proteins have an asymmetrical tertiary structure, while multi -subunit proteins can exhibit several types of symmetry. - ANSWER -True The functional organization of proteins where specific complexes of two or more polypeptides are formed is called ________ structure. - ANSWER -Quaternary structure To what level of structure do α-helices belong? - ANSWER -Secondary structure What is TRUE about the rotation of bonds in a protein backbone? - ANSWER -The bond between the carbonyl carbon and nitrogen is restricted. Other bonds are free to rotate depending only on steric hindrance or the presence of proline residues. The conformation of the backbone of a polypeptide is described completely by the angle(s) of rotation about which bond(s)? - ANSWER -
N-Cα and C α-C bonds only Ramachandran determined the "allowed" values of the phi and psi angles primarily by considering ________. - ANSWER -Steric Hindrance The amino acid that destabilizes alpha -helical structures and is usually found at the ends of alpha helices is______________. - ANSWER -
Glycine Proline is NOT often found in α-helices of proteins because it - ANSWER -
Lacks a hydrogen atom on its amide nitrogen
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