42. Which of the following is true about zwitterions? A). They are positively ch

Question

42. Which of the following is true about zwitterions? A). They are positively charged. B). They are negatively charged. C). They are electrically neutral. D). The charge depends on the zwitterion.

43. Which of the following is true of the isoelectric point (pI) 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

44. Which of the following is true of an amino acid at a pH below its isoelectric point (pI)? A). It will have a negative charge. B). It will be electrically neutral. C). It will have a positive charge. D). We cannot predict its charge.

45. Which of the following is a type of secondary structure? A). -helix B). -pleated sheet C). both A and B D). neither A nor B 46. Which of the following contributes to the tertiary structure of proteins? A). the sequence of amino acids B). hydrogen bonding within the backbone C). hydrogen bonding between the side chains D). the interaction of protein subunits

47. How many protein chains make up hemoglobin? A). 1 B). 2 C). 3 D). 4

48. Which of the following denaturing agents affects disulfide bonds? A). detergents B). heat C). heavy metals D). urea

49. Which level of protein structure is not affected by denaturation? A). primary B). secondary C). tertiary D). quaternary

Explanation / Answer

42. zwitterions are,

C). They are electrically neutral.

43. The isoelectric point (pI) of amino acids is,

C). It is the pH at which an amino acid has equal numbers of positive and negative charges.

44. An amino acid at a pH below its isoelectric point (pI) would,

C). It will have a positive charge.

45. The type of secondary structure would be,

A). -helix

46. The following contributes to the tertiary structure of proteins,

C). hydrogen bonding between the side chains

47. Number of protein chains that make up hemoglobin,

D). 4

48. Denaturing agents that affects disulfide bonds are,

C). heavy metals

49. The level of protein structure which is not affected by denaturation is,

A). primary

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