### Question 35#### Which of the following is true?A. All 20 common amino acids have an amino group and a carboxyl group bonded to the same carbon atom B. All 20 common amino acids exist in nature equally as both the D and L stereoisomers C. All amino acids have mirror-image pairs designated D and L D. Uncharged R group of amino acids are not polar E. More than one of the above are correct This multiple-choice question is designed to test the understanding of the properties and structures of amino acids, which are the building blocks of proteins. Each option addresses a different aspect of amino acid chemistry, including their structure, stereoisomerism, and the properties of their side chains (R groups).

Amino acids are biomolecules that have an amino group and a carboxyl group, a hydrogen atom and a…

Answered: 35. Which of the following is true? A.…

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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5. Classify each of the following amino acids as polar or nonpolar and hydrophilic and hydrophobic. NH2 CH2 CH2 H2N-C-COOH H2N-C-COOH H. a. b. Polar or nonpolar: Hydrophilic or Hydrophobic:
Which of the following is NOT TRUE about secondary structure in proteins? (More than one may apply) A. Stabilized by non-covalent bonds B. Is illustrated by DnaA molecules interacting in the ori C. Unravels at high temperatures when intramolecular non-covalent bonds are destroyed D. Occurs in a subregion of a protein E. Exemplified by beta sheets F. Describes the order of amino acids in a polypeptide
The amino acid alanine, shown below, contains all of the following functional groups except A. an amino group. B. a methyl group. C. an ester group. D. a carboxyl group.
1. Isoelectric point of polypeptide: (1) is pH at which the o-carboxyl and o-amino groups are uncharged. (2) is pH at which the net charge on the molecules in solution is 0. (3) is pH at which the charge of the o-carboxyl group is higher than the charge of the o- amino group. А. (1) only В. (2) only С. (3) only D. (1) and (3) E. (2) and(3)
The peptide linkages are essentially planar O A. Primary Structure B. Secondary Structure O c. Tertiary Structure O D. Quaternary Structure 3
1.Describe in detail how to detect the primary structure of protein. 2.Given a mixture of lysine,histidine and cysteine.The isoelectronic point of the amino acids are as follows: histidine:7.64 lysine:9.74 cysteine:5.02 Show how you will separate the mixture into the pure forms. State and describe any instrument that you will use to separate the components in the mixture.
Which of the following statements is/are TRUE for globular proteins? A. sensitive to changes in pH & heat B. regular amino acid sequence C. soluble in water D. structural role
Match amino Acid R group characteristics to the biochemical bond it can form. Alanine ◆ Glycine Proline Aspartic Acid Lysine Tryptophan ◆ Methionine Threonine Asparagine Histidine A. Pi-bonding aromatic bonds B. Non-polar, contains a sulfur atom C. Non polar bonds D. Amide group bonds E. Inserts a kink (non-freely rotating bond F. Anionic group donating bonds G. Hydroxy group bonding H. Cationic group with pK = 6.0 I. No-R group - highly flexible J. Cationic group donating bond
5. Dipeptide a. Draw a dipeptide with one polar amino acid connected to one nonpolar amino acid b. Label the functional groups that you recognize c. Label the chemical bond that connects the amino acids
Which of the following is incorrect about the peptide Arg-Asp-Cys-Tyr-Gln-Arg-Glu? It has six peptide bonds b. It has a net charge of zero at pH 7 It has six charged groups at pH 7 d. None; all the other choices are correct a. C.
Which of the following describes the most likely outcome of a mutation that causes a sin- gle amino acid to be removed from a protein subunit? A It will affect the primary, secondary, and tertiary structures of the protein. B с D It will affect the secondary and tertiary structures of the protein but not the primary structure. There will be no observable effect on the structure of the protein. It will change the primary structure of the protein without affecting other structures in the protein.
1. The hydropathic index represents the sum of hydrophobic and hydrophilic residues of a polypeptide. A.true B.false

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