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UMD BSCI 330 exam 2 Practice Questions and Answers

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UMD BSCI 330 exam 2 Practice Questions and Answers with proteins, structure = - ANSWER-function describe the structure of primary proteins - ANSWER--linear sequence of amino acid residue -determines mRNA structure the structure of primary amino acids is dependent on? - ANSWER-covalent binds b/...

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  • October 31, 2024
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  • UMD BSCI 330
  • UMD BSCI 330
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UMD BSCI 330 exam 2 Practice Questions

and Answers


with proteins, structure = - ANSWER✔✔-function


describe the structure of primary proteins - ANSWER✔✔--linear sequence of amino acid residue


-determines mRNA structure


the structure of primary amino acids is dependent on? - ANSWER✔✔-covalent binds b/t amino acids in

linear sequence


describe structure of secondary proteins - ANSWER✔✔--folding & twisting of peptide backbone


-NO amino acid side chain interactions


the structure of secondary protein is dependent on? - ANSWER✔✔-weak H-bonds b/t C=O & N-H in

backbone


- NOT SIDE CHAINS


What are two well known structures of secondary proteins? - ANSWER✔✔--alpha helix



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-beta helix


describe the structure of alpha helix - ANSWER✔✔--rigid cylindrical structure


-coils clockwise


the structure of alpha helix is dependent on? - ANSWER✔✔-H-bonding between C=O & N-H are 4 amino

acids apart ON BACKBONE


4 amino acids = ___ helix turns - ANSWER✔✔-ONE


describe the structure of beta sheet's - ANSWER✔✔--flat


-perpendicular interactions


the structure of beta sheet's is dependent on? - ANSWER✔✔-H-bonding is between C=O & N-H on

ADJACENT polypeptide chains


in beta sheet's, adjacent polypeptide chains can be


___ OR ___ - ANSWER✔✔-parallel or antiparallel


is the amino acid sequence of every protein identical to the genetically encoded primary protein? -

ANSWER✔✔-NO! proteins get modified after translation


describe the structure of tertiary proteins - ANSWER✔✔-3D arrangement of secondary structure


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the structure of tertiary protein is dependent on? - ANSWER✔✔-noncovalent attraction between R

group & enviornment


what are examples of the types of enviornment tertiary protein R groups interact with? - ANSWER✔✔--

hydrophobic/hydrophillic


-charge-charge


-salt concentration


- H bonds


describe the function(s) of disulfide bonds - ANSWER✔✔-- help LOCK structure in place


-dont drive structure


Disulfide bonds in a protein chain connect - ANSWER✔✔-2 cysteine residues


disulfide bonds only occur in ___ conditions. ex ___ enviornment - ANSWER✔✔--oxidative conditions


- extracellular enviornments


what happens to disulfide bonds in reduction conditions? - ANSWER✔✔-2 independent sulfides in

cytoplasm


unfolded state of proteins = - ANSWER✔✔-lower free energy



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