34. Which of the following amino acids can coordinate to a metal ion? a. arginin

Question

34. Which of the following amino acids can coordinate to a metal ion? a. arginineb. glutamic acid c. isoleucine d. phenylalanine 35. Which of the following denaturing agents affects hydrophobic regions? a. detergents c. heavy metals b. heat d. urea 36. Which of the following pairs of amino acid s can form hydrogen bonds? a. alanine and glutamic acid c. leucine and phenylalanine b. aspartic acid and lysine d. serine and tyrosine 37. How many amino acids have an amide side chain? c. 3 d.4 38. Which of the following is true of the isoelectric point of amino acids? a. The isoelectric points of all amino acids are the same. b. It is the pH at which an amino acid conducts electricity c. It is the pH at which an amino acid has equal numbers of positive and negative charges. d. All of the above are true 39. Antiparallel -sheets have t progress from N to C termini in the same direction. a. sheets that b. usually all of their hydrophobic residues on one side of the sheet. c. all hydrophobic residues. d. all hydrophilic residues e. fibers that can be stretched or extended, but are not flexible 40. Alpha helices are stabilized primarily by: a. hydrogen bonds between the main chain peptide bond component atoms. b. electrostatic interactions between R-groups c, hydrophobic interactions between the -carbons of the main chain. d. hydrogen bonding between the R-groups. e. hydrophobic interactions between R -groups and the solvent water . An electrostatic interaction might occur within a protein between which of the following amino acid pairs at typical physiological pH? a. Ser/Asn b. Asp/Glu c. Arg/Cys d. Lys/Asp e. Val/lle

Explanation / Answer

ans 34 part d glutamic acid

ans 35 d urea

Urea alters the hydrophobic effect and encourages solvation of hydrophobic groups

ans 36 d serine and tyrosine

serine and tyrosine have hydroxyl groups, which forms hydrogen-bond .

ans 37 b 2

The amide formed from glutamic acid is called glutamine and the amide formed from aspartic acid is called asparagine.

ans 38 c it is a point at which equal number of positive and negative charges exists

The isoelectronic point  is the pH at which the amino acid does not migrate in an electric field i.e net charge is zero

ans 39 B

antiparallel beta sheets typically distribute hydrophobic residues only on one side.

ans 40 a

every backbone NH group donates a hydrogen bond to the backbone C=O group of the amino acid located three or four residues away in the the protein sequence.

ans 41 d lys/asp

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