Concept explainers
(a)
Interpretation:
The structure of lysine should be drawn above its isoelectric point.
Concept Introduction:
Amino acids are called as zwitterions. At all the pH ranges, they consist an ionic character. At low pH, an amino acid is a positive ion and at high pH it is negative ion. Amino acids have equal positive and negative charges at an intermediate pH. This pH is mentioned as an isoelectric point.
(b)
Interpretation:
The structure of lysine should be drawn below its isoelectric point.
Concept Introduction:
Amino acids are called as zwitterions. At all the pH ranges, they consist an ionic character. At low pH, an amino acid is a positive ion and at high pH it is negative ion. Amino acids have equal positive and negative charges at an intermediate pH. This pH is mentioned as an isoelectric point.
(c)
Interpretation:
The structure of lysine should be drawn at its isoelectric point.
Concept Introduction:
Amino acids are called as zwitterions. At all the pH ranges, they consist an ionic character. At low pH, an amino acid is a positive ion and at high pH it is negative ion. Amino acids have equal positive and negative charges at an intermediate pH. This pH is mentioned as an isoelectric point.
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Chapter 22 Solutions
Introduction to General, Organic and Biochemistry
- 22-48 How many amino acid residues in the A chain of insulin are the same in insulin from humans, cattle (bovine), hogs, and sheep?arrow_forward22-25 Draw the most predominant form of lysine at its isoelectric point.arrow_forward22-42 (a) How many atoms of the peptide bond lie in the same plane? (b) Which atoms are they?arrow_forward
- 22-53 Do iron and zinc ions play role in protein structure? If so, what is the role for either or both?arrow_forward22-21 Explain why an amino acid cannot exist in an un-ionized form at any pH.arrow_forward22-97 Gelatin is derived from collagen by denaturation. Is a gelatin dessert likely to be a good source of dietary protein?arrow_forward
- 22-18 Draw the structures of L- and D-valine.arrow_forward22-64 If both cysteine residues on the B chain of insulin were changed to alanine residues, how would it affect the quaternary structure of insulin?arrow_forward22-16 Which amino acids in Table 22-1 have more than one stereocenter?arrow_forward
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