What are the building blocks of proteins? What type of hydrolysis will cleave a protein at a peptide bond? What qualitative test is used to detect peptide bonds? What is the positive result for the answer in no. 6? Proline will produce what result in the ninhydrin test? Which component of the Hopkins-Cole reagent will react with tryptophan?

What are the building blocks of proteins? What type of hydrolysis will cleave a protein at a peptide bond? What qualitative test is used to detect peptide bonds? What is the positive result for the answer in no. 6? Proline will produce what result in the ninhydrin test? Which component of the Hopkins-Cole reagent will react with tryptophan?

Biochemistry

9th Edition

ISBN:9781305961135

Author:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal

Publisher:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal

Chapter5: Protein Purification And Characterization Techniques

Section: Chapter Questions

Problem 28RE: REFLECT AND APPLY An amino acid mixture consisting of phenylalanine, glycine, and glutamic acid is...

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Qualitative Analysis of Proteins 1. Fill out the table below by providing the necessary information indicated per column. 2. As you have virtually conducted these qualitative tests for proteins, what do you think could be the essential practical or real-life applications of these tests?
TOPIC: Precipitation of Proteins by Alkaloidal Reagents 1. In what way can alkaloidal reagents precipitate proteins? ____________________________________________________________________ ____________________________________________________________________ 2. In excess of alkaloidal reagent, did the precipitate formed dissolve or not? What is the evidence for your answer? ____________________________________________________________________ ____________________________________________________________________
REFECT AND APPLY Suggest a reason why amino acids are usually more soluble at pH extremes than they are at neutral pH. (Note that this does not mean that they are insoluble at neutral pH.)
REFECT AND APPLY If the amino acids alanine and glycine react to form a peptide bond, is there more than one reaction product? If so, what products?
RECALL Describe citrulline and ornithine based on their similarity to one of the 20 standard amino acids.
RECALL Match the following statements about protein structure with the proper levels of organization. (i) Primary structure (ii) Secondary structure (iii) Tertiary structure (iv) Quaternary structure (a) The three-dimensional arrangement of all atoms (b) The order of amino acid residues in the polypeptide chain (c) The interaction between subunits in proteins that consist of more than one polypeptide chain (d) The hydrogen-bonded arrangement of the polypeptide backbone.
RECALL Identify conjugate acids and bases in the following pairs of substances:
RECALL How do D-amino acids differ from L-amino acids? What biological roles are played by peptides that contain D-amino acids?
REFECT AND APPLY Write equations to show the ionic dissociation reactions of the following amino acids: aspartic acid, valine, histidine, serine, and lysine.
RECALL Define the following terms: polysaccharide, furanose, pyranose, aldose, ketose, glycosidic bond, oligosaccharide, glycoprotein.
REFECT AND APPLY Suggest a reason (or reasons) why amino ac- ids polymerize to form proteins that have comparatively few covalent crosslinks in the polypeptide chain.
RECALL Which of the following lipids are not found in animal membranes? (a) Phosphoglycerides (b) Cholesterol (c) Triacylglycerols (d) Glycolipids (e) Sphingolipids