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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which of the following statements is correct regarding the affect of pH on the ionization of R groups in amino acids. Put yes or no next to each number. 1) at an acidic pH, amino groups in an R group tend to lonize by accepting a proton and have a positive charge2) at an acidic pH, carboxyl groups in an R group are likely to be in an unionized state.3) at an alkaline pH, amino groups in an R group have a tendency to remain unionized (and uncharged).4) at an alkaline pH, carboxyl groups in an R group have a tendency to lonize by loosing a hydrogen ion (H+)5) R groups that do not have an amino or carboxyl group do not ionize at pH of the environment changes.
Which of the following statements is true regarding the classification of amino acids? Group of answer choices The side chain of a polar basic amino acid contains hydroxyl groups The side chain of a polar acid amino acid contains carboxyl groups The side chain of the non-polar amino acid can exhibit H-bonding. The side chain of a polar amino acid contains hydrocarbon groups only
Given the following decapeptide sequence, which aminoacids would you expect to be on the surface of this moleculeonce it folds into its native conformation?Gly—Phe—Tyr—Asn—Tyr—Met—Ser—His—Val—Leu
Some amino acids are synthesized by replacing the keto group (CO) of an organic acid known as an α-keto acid with an amino group (CNH+3). Identify the amino acids that can be produced this way from the following α-keto acids:
Which of the following amino acids is most likely to be found on the outside of a soluble protein? Which is more likely to be found on the inside? Explain each answer. (Hint: Consider the effect of the amino acid side chain in each case and that the protein is folded up into its globularform.)(a) Leucine (b) Glutamate(c) Phenylalanine (d) Glutamine
Which of the following amino acids have R groups that have hydrogen- bonding potential? Ala, Gly, Ser, Phe, Glu, Tyr, Ile, and Thr
Which of the following amino acids is not part of tetramer that is bounded to NAM and glycine? L-Glu D-Ala L-lys D-Glu L-Ala
An unknown amino acid dissolves in octanol and is calculated to have a negative ΔG when going from water to octanol. What is known about the amino acid? 1)polar, hydrophobic 2)Non polar, hydrophilic 3)polar: hydrophilic 4)Non polar, hydrophobic
Which of the following amino acid pairs may form hydrogen bonds between their sidechains (select all that apply)? A. Arginine and Aspartate B. Lysine and Glutamate C. Glycine and Cysteine D. Alanine and Aspartate E. Lysine and Asparagine
Which of the following pairs of amino acids can have intermolecular hydrogen bonding between the functional groups in their side chains? Select all that apply. phenylalanine and tyrosine two tyrosine residues serine and threonine alanine and threonine
Which of the amino acids will nearly always be found buried in the center of proteins? valineglycinelysineglutamic acid
What is the predominant form of the following amino acids at pH= 11? What is the overall charge on the amino acid? glutamic acid

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