Unit Seven Self-Assessment Questions.docx

A h 2 nch 2 coo b nhch 2 coo c h 3 n ch 2 cooh d h 3

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a. H 2 NCH 2 COO - b. - NHCH 2 COO - c. H 3 N + CH 2 COOH d. + H 3 NCH 2 COO - 5) In a dipeptide, two amino acids are joined together through a(n) a. Amide linkage b. Dipolar interaction c. Ionic bond d. Hydrogen bond 6) The N-terminal amino acid and the C-terminal amino acid of the peptide Met-Ile-Val- Glu-Cys-Tyr-Gln-Trp-Ile are, respectively, a. Ile and Met b. Met and Asp c. Met and Ile
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Unit Seven Test on April 28, 2017 d. Trp and Asp 7) How many different tripeptides can be formed from alanine, valine, and lysine, when each appears only once in each product? a. 1 b. 3 c. 6 d. 9 8) The tripeptides represented as Ala-Val-Lys and Lys-Val-Ala are a. Different only in name b. Different in molar mass c. Exactly the same d. Two different peptides Section Five 1) Hydrogen bonds form between the N—H group of one amino acid and the C=O group of another, giving a protein molecule in the form of an alpha helix or a beta pleated sheet. What level of protein structure do those forms represent? a. Primary b. Quaternary c. Secondary d. Tertiary 2) Which level of protein structure is maintained in part by dispersion forces? a. Primary structure b. Quaternary structure c. Secondary structure d. Tertiary structure 3) The arrangement of several protein subunits into a specific pattern, as in hemoglobin, is an example of a. Primary structure b. Quaternary structure c. Secondary structure d. Tertiary structure 4) Which level of protein structure is maintained is part by dispersion forces? a. Dispersion linkages b. Disulfide linkages c. Hydrogen bonds d. Salt bridges 5) An acidic side chain of amino-acid unti on a protein chain reacts with the basic side chain of an amino-acid unit on another chain or at some distance away on the same chain to form a a. Dispersion linkage b. Disulfide linkage c. Hydrogen bond d. Salt bridge
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Unit Seven Test on April 28, 2017 6) When nonpolar side chains of amino-acid units in a protein chain interact with other nonpolar side chains of amino-acid units on another chain or at some distance away on the same chain, the interactions are a. Dispersion forces b. A disulfide linkage c. A hydrogen bond d. A salt bridge 7) The molecule on which an enzyme acts is called the enzyme’s a. Catalyst b. Coenzyme c. Cofactor d. Substrate 8) According to the induced-fit model of enzyme action, the a. Action of an enzyme is enhanced by an inhibitor b. Active site is the same as the allosteric site c. Shapes of active sites are rigid and only fit substrates with exact complementary shapes d. Shape of the active site can change somewhat to fit a substrate 9) An inorganic metal ion working with an enzyme molecule is called a(n) a. Cofactor b. Apoenzyme c. Coenzyme d. Stimulator 10) An enzyme is a catalyst, or substance that a. Binds to other molecules b. Breaks down other molecules c. Is made from smaller molecules d. Increases reaction rate 11) The pure protein part of an enzyme is called a(n) a. Apoenzyme b. Coenzyme c. Holoenzyme d. Riboenzyme Section Six 1) The monomer units of nucleic acids are a. Amino acids b. Monosaccharides c. Nucleosomes d. Nucleotides 2)
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