Choose the MOST appropriate answer.1. The bond formed between water molecule and the side chain (R group) of serine isA. peptide bondB. charge-charge interactionC. hydrophobic interactionD. hydrogen bondE. peptide bondWhich pairs of amino acids has the strongest interaction between their R groups at pH7?A. aspartate and lysineB. phenylalanine and alanineC. glutamine and arginineD. valine and isoleucine2.E. tyrosine and phenylalanine3. At pH7, which of the following amino acids has zero net charge?A. ArginineB. Aspartic acidC. Glutamic acidD. HistidineE. Lysine4. On a single-stranded DNA, the basic units are linked to one another by_A. Disulfide linkagesB. Phosphoanhydride bondsC. Phosphodiester bondsD. Hydrogen bondsE. Hydrophobic interactions

A peptide linkage is the backbone of a polypeptide chain. Hydrophobic interaction is formed between…

Answered: 1. The bond formed between water…

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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1. The interaction formed between atoms A and B is но H2N NH N H2N NH Но NH2 A В A. Ionic bond B. Hydrophobic interaction © Hydrogen bond D. Peptide bond E. Glycosidic bond 2. Which pair of amino acids has the strongest interaction between their R groups? (A) aspartic acid and lysine B. phenylalanine and alanine C. glutamine and arginine D. valine and isoleucine E. two cysteines disulfde 3. At pH6, which of the following amino acid has zero net charge? A. Alanine B. Arginine C.) Cysteine D. Lysine E. Histidine 1
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
1. a. Draw the following pentapeptide: lysine-leucine-aspartate-threonine-phenylalanine b. Label the amino and carboxyl terminus of your peptide c. Label each amino acid residue with one and three letter abbreviations d. Label the alpha carbons e. Label the bonds around which phi and psi rotational angles occur f. Which amino acid in this chain is most likely to be phosphorylated? Which amino acid is most likely to be acetylated?
Addition of _____ to a multi-subunit protein would involve the breaking of covalent bondsa. Tween-80, a detergentb. 5.0 M NaClc. Dithioerythritold. Guanidinium hydrochloridee. None of the abovepls explain why
6. Below are the structures of 3 amino acids. #3- ギ2~ H3N-C-coo- CH2 H. tH,N-c-coo- *AN-と-ce C Hz N Hz a. Which one(s) react with strong acids? b. Which one(s) react with strong bases? 0.
4. a. Give the full names of the amino acids in this peptide. НзN — CH—С-N—CH— С-N—CH—С—О ČH3 H ČH,OH H. CH2 -ОН b. Calculate the isoelectric point (pl) of a peptide with sequence SNARE. Show your work in a table, giving the pKa values of the ionizable groups, pH, and charges. Step marks are counted. Don't need to write “protonated" or “deprotonated".
2. Amino Acid Stereochemistry. Hypothetical Situation: A novel amino acid is isolated from a hyperthermophilic bacterium discovered in Lassen National Park. The discovery is published in the Journal Science by a group of microbiologists from the CSU-Chico Department of Biology. The amino acid structure is shown below. H₂N- HO Ç CH₂ C1H OH CH₂ (a) Designate the stereochemical configuration (R or S) of all the chiral centers in the molecule. (b) is this a D- or L-amino acid? Would you expect to find it as part of a polypeptide? Why or why not?
Asparagine belongs to amino acid that are classified as O a. positively charged O b. polar uncharged O c. negatively charged O d. hydrophobic
NH2 C=NH2 NH3 ČH2 CH2 ČH2 CH2 H3N-C-Co0 NH HN- NH CH2 CH2 ČH2 CH2 HN-C-COO coos HN-C-COo H Choose A if the statement is CORRECT B if the statement is WRONG 1. The first amino acid is basic. 2. The second amino acid is acidic. 3. The third amino acid is positively charged. The second amino acid is zero charge, a zwitterion. These amino acids are H, L, and R. 4. 4 5.
H. N-C-C Choose A if the statement is CORRECT B if the statement is WRONG H он CH, This amino acid is/has: CH2 6. polar CH2 | CH2 | NH, _7. charged 8. basic side chain 9. aromatic side chain 10. K
27.Arginine is the most basic of the 20 amino acids because its side chain is most cells conditions. A. Very highly charged B. Hydrophobic C. Titrated D. Protonated E. Negatively charged under 28.Concentrations of some proteins cannot be estimated by UV spectrophotometry because they are A. High in non-absorbing amino acids B. Low in tryptophan and tyrosine C. Low in protein D. High in aromatic amino acids
Part B The full structure for the polypeptide found in wasp venom is shown. Identify the individual amino acids in the structure below. Drag the appropriate labels to their respective targets. lle Asn Leu Lys Ala Val Gln Asp Submit HN **** H₂N Request Answer NH₂ TI NH₂ 0= 16 NH₂ Reset Help NH₂

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