Biochemistry
9th Edition
ISBN: 9781305961135
Author: Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal
Publisher: Cengage Learning
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Chapter 3, Problem 20RE
REFECT AND APPLY Identify the charged groups in the peptide shown in Question 4 at pH 1 and at pH 7. What is the net charge of this peptide at these two pH values?
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Chapter 3 Solutions
Biochemistry
Ch. 3 - RECALL How do D-amino acids differ from L-amino...Ch. 3 - RECALL Which amino acid is technically not an...Ch. 3 - RECALL For each of the following, name an amino...Ch. 3 - RECALL Identify the polar amino acids, the...Ch. 3 - RECALL Identify the nonpolar amino acids and the...Ch. 3 - RECALL Are amino acids other than the usual 20...Ch. 3 - MATHEMATICAL Predict the predominant ionized forms...Ch. 3 - MATHEMATICAL Draw structures of the following...Ch. 3 - MATHEMATICAL Predict the predominant forms of the...Ch. 3 - MATHEMATICAL Calculate the isoelectric point of...
Ch. 3 - MATHEMATICAL Sketch a titration curve for the...Ch. 3 - MATHEMATICAL Sketch a titration curve for the...Ch. 3 - MATHEMATICAL An organic chemist is generally happy...Ch. 3 - MATHEMATICAL Sketch a titration curve for aspartic...Ch. 3 - REFECT AND APPLY Suggest a reason why amino acids...Ch. 3 - REFECT AND APPLY Write equations to show the ionic...Ch. 3 - REFECT AND APPLY Based on the information in Table...Ch. 3 - REFECT AND APPLY If you were to have a mythical...Ch. 3 - REFECT AND APPLY What would be the pI for the...Ch. 3 - REFECT AND APPLY Identify the charged groups in...Ch. 3 - REFECT AND APPLY Consider the following peptides:...Ch. 3 - REFECT AND APPLY In each of the following two...Ch. 3 - REFECT AND APPLY Could the amino acid glycine...Ch. 3 - RECALL Sketch resonance structures for the peptide...Ch. 3 - RECALL How do the resonance structures of the...Ch. 3 - REFECT AND APPLY Would the peptide group be planar...Ch. 3 - Prob. 27RECh. 3 - REFECT AND APPLY Consider the peptides...Ch. 3 - REFECT AND APPLY Would you expect the titration...Ch. 3 - REFECT AND APPLY What are the sequences of all the...Ch. 3 - REFECT AND APPLY Answer Question 30 using...Ch. 3 - REFECT AND APPLY Most proteins contain more than...Ch. 3 - REFECT AND APPLY If the amino acids alanine and...Ch. 3 - Prob. 34RECh. 3 - REFECT AND APPLY Would the presence of a chiral...Ch. 3 - REFECT AND APPLY What might you infer (or know)...Ch. 3 - Prob. 37RECh. 3 - REFECT AND APPLY Suggest a reason why the amino...Ch. 3 - REFECT AND APPLY Consider the peptides...Ch. 3 - Prob. 40RECh. 3 - Prob. 41RECh. 3 - REFECT AND APPLY You are studying with a friend...Ch. 3 - Prob. 43RECh. 3 - REFECT AND APPLY Suggest a reason (or reasons) why...Ch. 3 - Prob. 45RECh. 3 - REFECT AND APPLY Speculate on the properties of...Ch. 3 - RECALL What are the structural differences between...Ch. 3 - RECALL How do the peptide hormones oxytocin and...Ch. 3 - RECALL What is the role of the disulfide bond in...Ch. 3 - RECALL Is it possible to form cyclic peptides...Ch. 3 - Prob. 51RECh. 3 - RECALL What types of experiments led to evidence...Ch. 3 - Prob. 53RECh. 3 - THOUGHT QUESTION Imagine we identify a gene that...
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- REFECT AND APPLY Consider the peptides GlyProSerGluThr(open chain) and GlyProSerGluThr with a peptide bond linking the threonine and the glycine. Are these peptides chemically the same?arrow_forwardREFECT AND APPLY Consider the peptides SerGluGlyHisAlaandGlyHisAlaGluSer. How do these two peptides differ?arrow_forwardREFECT AND APPLY Would you expect the titration curves of the two peptides in Question 28 to differ? Why or why not?arrow_forward
- REFLECT AND APPLY An amino acid mixture consisting of lysine, leucine, and glutamic acid is to be separated by ion-exchange chromatography, using a cation-exchange resin at pH 3.5, with the eluting buffer at the same pH. Which of these amino acids will be eluted from the column first? Will any other treatment be needed to elute one of these amino acids from the column?arrow_forwardRECALL Sketch resonance structures for the peptide group.arrow_forwardREFLECT AND APPLY Both RNA and DNA have negatively charged phosphate groups as part of their structure. Would you expect ions that bind to nucleic acids to be positively or negatively charged? Why?arrow_forward
- REFLECT AND APPLY Why do amino acids other than methionine occur in the N-terminal position of proteins from eukaryotes?arrow_forwardRECALL Identify the polar amino acids, the aromatic amino acids, and the sulfur-containing amino acids, given a peptide with the following amino acid sequence: ValMetSerIlePheArgCysTyrLeuarrow_forwardREFLECT AND APPLY Many properties of acetic acid can be rationalized in terms of a hydrogen-bonded dimer. Propose a structure for such a dimer.arrow_forward
- 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.arrow_forwardREFLECT AND APPLY Draw Haworth projection formulas for dimers of glucose with the following types of glycosidic linkages: (a) A (14) linkage (both molecules of glucose in the form) (b) An ,(11) linkage (c) A (16) linkage (both molecules of glucose in the form)arrow_forwardREFLECT AND APPLY The structures of tRNAs contain several unusual bases in addition to the typical four. Suggest a function for the unusual bases.arrow_forward
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