Chemistry: An Atoms-Focused Approach (Second Edition)
2nd Edition
ISBN: 9780393614053
Author: Thomas R. Gilbert, Rein V. Kirss, Stacey Lowery Bretz, Natalie Foster
Publisher: W. W. Norton & Company
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Chapter 20 Solutions
Chemistry: An Atoms-Focused Approach (Second Edition)
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- 22-44 How can a protein act as a buffer?arrow_forward22-45 Proteins are least soluble at their isoelectric points. What would happen to a protein precipitated at its isoelectric point if a few drops of dilute HCl were added?arrow_forwardConsider a buffer that has a free amino group (X-NH2 ) with a pKa of 8.5. If the buffer is present at a 0.1 M concentration what percentage of the buffer is in the acid form at pH 8.0?A. 25B. 50C. 60D. 75E. 90arrow_forward
- Which amino acid is hexagonal close packed? is it glycine?arrow_forwardAmino acids may be acidic, alkaline or neutral. How does this happen? What are essential and non-essential amino acids? Name one of each type.arrow_forward3. Draw the tripeptide Alanine-Cysteine-Serine (R1 = CH3, R2 = CH2SH, R3 = CH2OH) under the following pH conditions and list the net charge on the protein. A. pH= 1 Net charge? B. pH=7 Net charge? C. pH=12 Net charge?arrow_forward
- Which factors will cause protein denaturation? Select all that apply. a. heavy metals - Hg2+, Pb2+, Ag+ b. organic solvents c. changes in temperature d. Tris a buffer commonly used with proteins e. small metal ions - Na+, Ca2+, Cl- f. aqueous phosphate bufferarrow_forwardConsider the tripeptide leucylvalyltryptophan. a. Specify its structure using three-letter symbols for the amino acids. b. How many peptide bonds are present within the peptide? c. Which of the amino acid residues has the largest R group? d. Which of the amino acid residues, if any, has a basic side chain?arrow_forward
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