PracticeQuestionss_04

PracticeQuestionss_04 - 1. Indicate whether the following...

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1. Indicate whether the following statements are true or false. If a statement is false, explain why it is false. A. Generally, the total number of nonpolar amino acids has a greater effect on protein structure than the exact order of amino acids in a polypeptide chain. B. The “polypeptide backbone” refers to all atoms in a polypeptide chain, except for those that form the peptide bonds. C. The chemical properties of amino acid side chains include charged, uncharged polar, and nonpolar. D. The relative distribution of polar and nonpolar amino acids in a folded protein is determined largely by hydrophobic interactions, which favor the clustering of nonpolar side chains in the interior. 2. Drawn below are segments of β sheets, which are rigid pleated structures held together by hydrogen bonds between the peptide backbones of adjacent strands. The amino acid side chains attached to the C α carbons are omitted for clarity. A. For panel (A) and for panel (B), indicate whether the structure is parallel or antiparallel. B. Draw the hydrogen bonds as dashed lines (- - - - - -). C. Which of the two beta sheets is likely to be more stable? 3. For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once. The α helices and β sheets are examples of protein __________________ structure. A protein such as hemoglobin, which is composed of more than one protein __________________, has __________________ structure. A protein’s amino acid sequence is known as its __________________ structure. A protein __________________ is the modular unit from which many larger single-chain proteins are constructed. The three-dimensional conformation of a protein is its __________________ structure. allosteric ligand secondary domain primary subunit helix quaternary tertiary C a C a C a C C O O N N N H H H C a C a C C O O N N H H C a C a C C O N H C C O O C N H N H C C O O N H N C a H C O N N C a C a C a C a C a C a C a C C O O N N N H H H C a C a C C O O N N H H C a C a C C O N H C C O O C N H N H C C O O N H N C a H C O N N C a C a C a C a (B) C a C a C C O O N N N H H C a C a C C O O N N H H C a C a C C O N H C a C a C C O O N N N H H C a C a C C O O N N H H C a C a C C O N H C a C a C C O O N N N H H C a C a C C O O N N H H C a C a C C O N H C a C a C C O O N N N H H C a C a C C O O N N H H C a C a C C O N H (A)
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4. Protein structures have several different levels of organization. The primary structure of a protein is its amino acid sequence. The secondary and tertiary structures are more complicated. Consider the definitions below and select the one that best fits the term “protein domain.” A. a small cluster of α helices and β sheets B. the tertiary structure of a substrate-binding pocket C. a complex of more than one polypeptide chain
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PracticeQuestionss_04 - 1. Indicate whether the following...

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