Why do amino acids display a lower pKa value for the carboxylicacid group compared to acetic acid?The chirality of the amino acid favors the deprotonation of thecarboxylic acid function.The ammonium function on the chiral center helps to stabilizethe negative charge on the carboxylate.Amino acids have a higher melting point than acetic acid.The carboxylate ion is stabilized by the side chain of the aminoacid.The negative charge on the carboxylate is stabilized byresonance with the amino group.

Amino acids are biomolecules where carbon atom is bonded to 4 groups; a carboxylic acid group, an…

Answered: Why do amino acids display a lower pK,…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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How do the standard amino acids differ from one another? in whether or not the amino group is chiral in the number of chiral carbon atoms between the carboxyl group and the amino group in the identity of the R group (side chain) in whether or not the carboxyl group is chiral
Long chains of beta glucose monomers are held together in microfibril bundles by bonds Vanderwaals Interaction ionic covalent hydrogen In a fat molecule a glycerol is covalently bonded to fatty acid tails by a glycosidic link a hydrogen bond an ionic bond an ester link If the R group of an amino acid is nonpolar, it probably consists of one or more methyl groups hydroxyl groups amino groups hydrophilic groups
All of the following pairs are well-match, except one: O Oleic fatty acid is : unsaturated fatty acids O Saturated fatty acids : solid at room tempreture Ceramide : simplest glycerolipid O TGs: stored in adipose tissue
Match the following descriptions with the correct lipid-based compounds: Cholesterol Sphingolipids Phosphoacylgycerol Glycerophospholipids Fatty acyls…
Lipoprotein particles are relatively large, sphericalclumps of protein and lipid molecules (see Figure 3.18)that circulate in the blood of mammals. They are likesuitcases that move cholesterol, fatty acid remnants, triglycerides, and phospholipids from one place to anotherin the body. Given what you know about the solubilityof lipids in water, which types of lipids would you predict to be on the outside of a lipoprotein clump, bathedin the water-based fluid portion of blood?
An amino acid structure contains a -COOH and -NH2 group in the same molecule. The -COOH group donates a proton to the -NH2 group. Because of this, the amino acid structure contains a positive charge on one atom and a negative charge on the other. What is the term used to refer to this character of amino acids? O Amphiphatic O Isoelectric point Zwitterions O Amphoteric
Which of the following might be a feature(s) of a lipid that has been converted from a fully saturated fatty acid to a fatty acid containing several trans double bonds? Select all that apply. The trans fatty acid will now have a higher melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack more closely with saturated fatty acids, than with unsaturated fatty acids containing cis double bonds The trans fatty acid will now have a lower melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack most closely with unsaturated fatty acids containing cis double bonds, than with saturated fatty acids
How much energy is released upon the hydrolysis of ATP? What happens to this energy during phosphate transfer to proteins? Given your answer, why is this significant? What is the consequence of this energy on the equilibrium constant for a conformational change of a protein?
Lipid solubility is an important parameter that determines the predicted effectiveness of new pharmaceutical medications ahead of their release for public use. Which of the following provides the best explanation for the relevance of lipid solubility in medications? A B с D High lipid solubility will ensure the presence of energy-storing lipid molecules to support the chemical functions of the medication. Low lipid solubility will allow the medication to remain longer in the body, increasing its effectiveness. Low lipid solubility will facilitate more favorable interactions with enzymes in the body. allowing the medication to act more quickly. High lipid solubility will allow the medication to more readily diffuse through the cell membrane.
Which of the following statements is TRUE for nonpolar amino acid residues of polypeptides or proteins in an aqueous solution? None of the above They are hydrophilic and found buried within proteins They are hydrophilic and found on protein surfaces They are hydrophobic and found on protein surfaces They are hydrophobic and found buried within proteins
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Samples of three different triglycerides, A, B, and C, were tested to determine the melting point of each one. The results of the tests are shown in the graph. The length of the fatty acids in A, B, and C is the same. Which of the three triglycerides is likely to have the fewest double bonds in the fatty acid side chains? triglyceride C There is no way of knowing based on the information available triglyceride A triglyceride B

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