Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
10th Edition
ISBN: 9780133922851
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 5.4, Problem 3CC
WHAT IF? Ø Where would you expect a polypeptide region rich in the amino acids valine, leucine, and isoleucine to be located in a folded polypeptide? Explain.
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Regarding the last answer choice, how come both alpha helices and beta sheets aren't denatured when the heat breaks peptide bonds? If heat were to break peptide bonds, wouldn't that affect the primary structure which inevitably affects the more complicated structures?
Where would you expect a polypeptide region Ridge and the amino acid valine, leucine, and isoleucine to be located in a folded polypeptide? explain
Consider a protein in which a negatively charged glutamic acid side chain (pKa=4.2)(pKa=4.2) makes a salt bridge (ion-ion interaction) with a positively charged histidine side chain (pKa=6.5)(pKa=6.5). Do only part B.
Chapter 5 Solutions
Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
Ch. 5.1 - What are the four main classes of large biological...Ch. 5.1 - How many molecules of water are needed to...Ch. 5.1 - WHAT IF? If you eat a piece of fish, what...Ch. 5.2 - Write the formula for a monosaccharide that has...Ch. 5.2 - Prob. 2CCCh. 5.2 - WHAT IF? After a cow is given antibiotics to...Ch. 5.3 - Compare the structure of a fat (triglyceride) with...Ch. 5.3 - Why are human sex hormones considered lipids?Ch. 5.3 - Prob. 3CCCh. 5.4 - What parts of a polypeptide participate in the...
Ch. 5.4 - Prob. 2CCCh. 5.4 - WHAT IF? Where would you expect a polypeptide...Ch. 5.5 - Prob. 1CCCh. 5.5 - DRAW IT In a DNA double helix, a region along one...Ch. 5.6 - How would sequencing the entire genome of an...Ch. 5.6 - Given the function of DNA, why would you expect...Ch. 5 - What is the fundamental basis for the differences...Ch. 5 - Compare the composition, structure, and function...Ch. 5 - Why are lipids not considered to be polymers or...Ch. 5 - Explain the basis for the great diversity of...Ch. 5 - What role does complementary base pairing play in...Ch. 5 - Prob. 5.6CRCh. 5 - Prob. 1TYUCh. 5 - The enzyme amylase can break glycosidic linkages...Ch. 5 - Prob. 3TYUCh. 5 - The structural level of a protein least affected...Ch. 5 - Enzymes that break down DNA catalyze the...Ch. 5 - The molecular formula for glucose is C6H12O6. What...Ch. 5 - Which of the following pairs of base sequences...Ch. 5 - Construct a table that organizes the following...Ch. 5 - Prob. 9TYUCh. 5 - EVOLUTION CONNECTION Comparisons of amino acid...Ch. 5 - SCIENTIFIC INQUIRY Suppose you are a research...Ch. 5 - WRITE ABOUT A THEME: ORGANIZATION Proteins, which...Ch. 5 - SYNTHESIZE YOUR KNOWLEDGE Given that the function...
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- Can you help find the charge for the c terminal?arrow_forward. Assume that some protein molecule, in its folded native state, has one favored conformation. But, when it is denatured, it becomes a "random coil," with many possible conformations. (a) What must be the sign of AS for the change: native → denatured? (b) How will the contribution of AS for native → denatured affect the favorability of the process? What apparent requirement does this impose on AH if proteins are to be stable structures?arrow_forwardWhat is a helix-turn-helix motif? secondary structure in which an α helix is separated from a β sheet by a loop supersecondary structure in which an α helix is separated from another α helix by a turn supersecondary structure in which a β sheet is separated from a helix by a turn secondary structure in which two right-handed α helices are intertwined secondary structure in which two left-handed α helices are intertwinedarrow_forward
- Two peptide segments are shown below. Predict which one would have the most negative AG when going from an unfolded to a folded structure. Justify your choice. (i) Gly-Ala-Asn-lle-Val-Trp-Leu-Glu-Met-Phe-Val-Pro OR (ii) Ala-Gly-Lys-lle-Arg-Tyr-Thr-Cys-Val-Glu-Met-Serarrow_forwardPlease answer the two problems in the image and explain. Thank you.arrow_forwardList possible codon sequences for the following amino acids.(a) Val (b) Phe (c) Asn (d) Gly (e) Metarrow_forward
- Peptides and small proteins fold spontaneously in aqueous solution at room temperature. Thus, for a small protein in water, we can say ΔG FOLD < 0. Denoting the unfolded protein as Unf and the folded protein as Fld, we can write the following equation:Unf(aq)--DELTA G FOLD----> Fld(aq)Considering the transition from the unfolded state (in which there are many possible conformations) to the folded state (only one conformation), there is clearly a decrease in the entropy of the protein. However, protein folding is (correctly) described as an entropically driven process.a) Resolve this apparent paradox by identifying the enthalpy (ΔH) and entropy (−TΔS)components involved in protein…arrow_forwardLoop regions play important roles in the secondary structure of protein. Define loop region and give three (3) of the rolesarrow_forward(A) Give the polypeptide translation of the RNA sequence below. 5’-AUGGAAAUCAAAGUCAACCUUGAGUUUAGA-3’ (B) Write the chemical structure of the polypeptide sequence you determined in part (a) (C) Given the chemical structure of the polypeptide sequence you have written in part (b), answer True or False for each of the 5 statements below. (1) At least one of the amino acids in the sequence can undergo phosphorylation (2) The sequence looks like it could form a β turn (3) The sequence looks like it could form a β strand with one surface facing the interior of the protein and the other surface exposed to water (4) At least one of the amino acids in the polypeptide sequence can undergo oxidation to form a disulfide bridge to another polypeptide (5) The sequence looks like it could form an α helix that would be part of a coiled coil structure within a proteinarrow_forward
- Can you please help find what the n terminal is?arrow_forwardConsider a protein in which a negatively charged glutamic acid side chain (pKa = 4.2) makes a salt bridge (ion-ion interaction) with a positively charged histidine side chain (pKa = 6.5). Part A Do you predict that this salt bridge will become stronger, become weaker, or be unaffected as pH increases from pH = 7.2 to pH = 7.8? The salt bridge will become stronger. The salt bridge will become weaker. The salt bridge will be unaffected. Submit Part B Previous Answers Correct At pH = 7.2 the glutamic acid (Glu) side chain will carry a charge of ~ -1 (at 3 pH units above the pKa for Glu, the side chain will be almost fully ionized); whereas the histidine (His) side chain will carry a charge of < +0.5 (at pH = pK₂ the charge on His would be +0.5; since pH = 7.2 is above its pKa, it will carry less (+) charge as it becomes more deprotonated). As the pH increase to 7.8, the charge on Glu will remain ~ -1 and the charge on His will decrease; thus, this salt bridge is predicted to become weaker…arrow_forwardDraw a peptide for cys-asn- pro-gly (Using the same format in picture)arrow_forward
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