Biology
Biology, 09.07.2019 22:00, phancharamachasm

The proteorhodopsin protein consists of a single polypeptide chain. what is the highest level of structure possible in this protein?

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Biology, 21.06.2019 20:30, chozz2783
Match the descriptions / definitions with the term they best describe 1. three dimensional relationship of the different polypeptide chains in a multisubunit protein or protein complex 2. common folding pattern in proteins in which a linear sequence of amino acids folds into a right-handed coil stabilized by internal hydrogen-bonding between polypeptide backbone atoms. 3. the amino acid sequence of a protein 4. a region on the surface of a protein that can interact with another molecule through noncovalent bonding. 5. three-dimensional arrangement of alpha-helices and beta-sheets within a single polypeptide, typically stabilized by a variety of noncovalent bonds, including ionic and hydrogen bonds, and nonpolar interactions / hydrophobic force. 6. the chain of repeating carbon and nitrogen atoms, linked by peptide bonds, in a protein. 7. common structural motif in proteins in which different sections of the polypeptide chain run alongside each other and are joined together by hydrogen bonding between atoms of the polypeptide backbone. 8. portion of a polypeptide chain that has a discrete tertiary structure of its own and can often fold independently of the rest of the chain 9. regular local folding patterns in a protein, including alpha-helix and beta-sheet a. primary structure b. beta-sheet c. protein d. coiled-coil e. polypeptide backbone f. secondary structure g. side chain h. tertiary structure i. binding site j. alpha-helix k. quaternary structure l. protein domain
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Biology, 27.06.2019 05:30, cass8947
Which of the following statements concerning protein structure is/are incorrect? a) the primary structure consists of a chain of amino acids joined by peptide bonds. b) the secondary structure consists of a twisting or folding of the peptide chai. c) the tertiary structure refers to the three dimensional shape of the protein. d) the quaternary structure is present in all proteins and consists of the combination. e) of several polypeptide chains.
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Biology, 06.07.2019 20:20, GutsnGlory
Rhodopsins are light-sensitive molecules composed of a protein (opsin) and retinal (derivative of vitamin a). opsin is a membrane protein with several alpha-helical segments that loop back and forth through the plasma membrane. there are two classes of rhodopsins. according to oded beje, one class has relatively slow dynamics (a photocycle of approximately 0.5 second) and is well suited for light detection. the second class has faster dynamics (a photocycle of approximately 0.02 seconds) and is well suited for chemiosmosis-pumping of protons or chloride ions across cell membranes. oded beje was the first, in september 2000, to report on a rhodopsin (proteorhodopsin) found in the domain bacteria. [source: o. beje et al., science 289 (2000): 1902.] proteorhodopsin consists of a single polypeptide chain. what is the highest level of structure found in this protein?
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Biology, 09.07.2019 16:30, blondie02
The tertiary structure of a protein is the a. organization of a polypeptide chain into an α-helix or β-pleated sheet b. order in which amino acids are joined in a polypeptide chain. c. unique three-dimensional shape of the fully folded polypeptide d. overall protein structure resulting from the aggregation of two or more polypeptide subunits
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