3- peptide ,Protein organization worksheet

Name: ID: Biochemistry Module In this worksheet, we will practice describing the synthesis, structures, and functions of proteins. Q1: Which of the following best explains the role of hydrogen bonds in protein structure? • • • • A Hydrogen bonds form within amino acids to join the carboxyl group to the amino group. B Hydrogen bonds form between amino acids to hold the protein in its secondarystructure shape (e.g., alpha-helix). C Hydrogen bonds form between amino acids to hold them in a polypeptide chain. D Hydrogen bonds form between amino acids and water molecules to contribute to the quaternary structure of the protein. Q2: Proteins are complex macromolecules formed from polypeptide chains. What monomers join to form polypeptides? • A Glycerol • B Lipids • C Fatty acids • D Simple sugars • E Amino acids Q3: Which of the following best describes the primary structure of a protein? • A The primary structure of a protein refers to the sequence of amino acids in its polypeptide chain. • • • B The primary structure of a protein is the complex 3D structure formed when multiple polypeptides interact and combine. C The primary structure of a protein is the 3D structure that forms due to interactions between the R groups of amino acids. D The primary structure of a protein is the folded structure (alpha-helix or beta-sheet) formed by additional bonds formed in the polypeptide chain. Q4: Which of the following best describes the quaternary structure of a protein? • • • • A The quaternary structure of a protein is the 3D structure that forms due to interactions between the R groups of amino acids. B The quaternary structure of a protein is the folded structure (alpha-helix or betasheet) formed by additional bonds formed in the polypeptide chain. C The quaternary structure of a protein is the complex 3D structure formed when multiple polypeptides interact and combine. D The quaternary structure of a protein refers to the sequence of amino acids in its polypeptide chain. Q5: Which of the following best describes the secondary structure of a protein? • • • • A The secondary structure of a protein refers to the sequence of amino acids in its polypeptide chain. B The secondary structure of a protein is the folded structure (alpha-helix or betasheet) formed by additional bonds that are formed in the polypeptide chain. C The secondary structure of a protein is the 3D structure that forms due to interactions between the R groups of amino acids. D The secondary structure of a protein is the complex 3D structure formed when multiple polypeptides interact and combine. Q6: Which of the following best explains the structure of a polypeptide? • A A polypeptide is a protein formed by the joining of three amino acids to a glycerol molecule. • • • B A polypeptide is a chain of amino acids joined together by carboxyl bonds between the amino groups of each amino acid. C A polypeptide is a chain of amino acids joined together by peptide bonds between the carboxyl group of one and the amino group of another. D A polypeptide is a chain of proteins joined by peptide bonds between the hydrogens of each protein. Q7: Which of the following best describes the tertiary structure of a protein? • • • • A The tertiary structure of a protein is the folded structure (alpha-helix or beta-sheet) formed by additional bonds that are formed in the polypeptide chain. B The tertiary structure of a protein is the complex 3D structure formed when multiple polypeptides interact and combine. C The tertiary structure of a protein refers to the sequence of amino acids in its polypeptide chain. D The tertiary structure of a protein is the 3D structure that forms due to interactions between the R groups of amino acids. Q8: The following is a list of bonds found in biological molecules: I. II. III. IV. V. Hydrogen Ionic Phosphodiester Disulfide bridges Glycosidic What bonds are commonly present in the tertiary structure of proteins? • A I only • B I, II, and IV • C I and IV only • D II, III, and IV • E I, II, and III Q9: Keratin is a long protein found in hair and nails, with many repeats of the sulfur-containing amino acid cysteine. Using the table provided, determine the group of proteins that keratin is most likely to belong to. • A Globular • B Fibrous • C Conjugated Q10: Part of the basic structure of an amino acid is provided. Give the molecular formula of the functional group that is missing. • A NH+4 • B NH2 • C CH3 • D COOH 11. A peptide bond is the linkage between: a. The carbonyl carbon of the carboxylic acid of one amino acid and the nitrogen of the amine of THAT amino acid b. The oxygen of the carboxylic acid of one amino acid and the carbon next to the amine of ANOTHER amino acid c. The carbonyl carbon of the carboxylic acid of one amino acid and the carbon NEXT TO the amine of another amino acid d. The carbonyl carbon of the carboxylic acid of one amino acid and the nitrogen of the amine of ANOTHER amino acid 12. What does N-terminus refer to? a. The end of a protein with a free carboxylic acid group b. The first amino acid with the abbreviation ‘N’ in the protein c. The end of a protein with a free amine group d. A protein chain 13-Proteins are built in the following sequence: A: two or more protein units attach to one another, or the protein attaches to a non-protein structure B: amino acid sequence is set C: chain folds back on itself D: beta pleating or spiraling occurs answer choices Primary: A, Secondary: B, Tertiary: C, Quaternary: D Primary: B, Secondary: D, Tertiary: C, Quaternary: A Primary: C, Secondary: D, Tertiary: B, Quaternary: A Primary: D, Secondary: B, Tertiary: C, Quaternary: A 14-Which protein? It is the most abundant protein in your body. It is the major component of connective tissues that make up several body parts, including tendons, ligaments, skin and muscles. It has many important functions, including providing your skin with structure and strengthening your bones. 15-Which letter corresponds to the tertiary protein structure? 16-give short notes on the structure of label E 17-Which letter corresponds to an beta sheet? 18-Which letter corresponds to alpha helix? 19- A new drug is developed which selectively cleaves covalent bonds between two sulfur atoms of nonadjacent amino acids in a polypeptide chain. Which level of protein structure in affected molecules would be most directly affected by the drug? Choose 1 answer: A. B. C. D. Secondary structure Tertiary structure Primary structure Quaternary structure 20-The image shows the amino Valine. Identify the R-group and identify which property this R-group is likely to belong? 21-Which parts of the amino acid react with amino acid to form a peptide bond? another

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