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 21RE
REFECT AND APPLY Consider the following peptides:
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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_forwardREFLECT AND APPLY A sample of a peptide of unknown sequence was treated with trypsin; another sample of the same peptide was treated with chymotrypsin. The sequences (N-terminal to C-terminal) of the smaller peptides produced by trypsin digestion were as follows: MetValSerThrLysValIleTrpThrLeuMetIleLeuPheAsnGluSeArg The sequences of the smaller peptides produced by chymotrypsin digestion were as follows: AsnGluSerArgValIleTrpThrLeuMetIleMetValSerThrLysLeuPhe Deduce the sequence of the original peptide.arrow_forwardREFECT 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?arrow_forward
- REFECT AND APPLY Would you expect the titration curves of the two peptides in Question 28 to differ? Why or why not?arrow_forwardMATHEMATICAL Calculate the isoelectric point of each of the following amino acids: glutamic acid, serine, histidine, lysine, tyro- sine, and arginine.arrow_forwardMATHEMATICAL Predict the predominant ionized forms of the following amino acids at pH 7: glutamic acid, leucine, threonine, histidine, and arginine.arrow_forward
- REFLECT AND APPLY Consider the following in light of the concept of levels of structure (primary, secondary, tertiary, quaternary) as defined for proteins. (a) What level is shown by double-stranded DNA? (b) What level is shown by tRNA? (c) What level is shown by mRNA?arrow_forwardREFLECT AND APPLY A sample of an unknown peptide was divided into two aliquots. One aliquot was treated with trypsin; the other was treated with cyanogen bromide. Given the following sequences (N-terminal to C-terminal) of the resulting fragments, deduce the sequence of the original peptide. Trypsin treatment AsnThrTrpMetIleLysGlyTyrMetGlnPheValLeuGlyMetSerArg Cyanogen bromide treatment GlnPheValLeuGlyMetIleLysGlyTyrMetSerArgAsnThrTrpMetarrow_forwardREFECT AND APPLY What might you infer (or know) about the stability of amino acids, when compared with that of other building- block units of biopolymers (sugars, nucleotides, fatty acids, etc.)?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 Why do amino acids other than methionine occur in the N-terminal position of proteins from eukaryotes?arrow_forward
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