4. Which of the following polypeptides is capable of forming the most stable alpha helix?a) EEEEEE at pH 7d)at pH 2e) PPPPPP at pH 7b) KKKKKKK at pH 7EEEEEE at pH 25/6. Explain your answer to the previous question.7. Which of the following is NOT true of a collagen helix or collagen?a) A collagen helix cannot contain prolines.b) A collagen helix has a special amino acid called Hypc) Collagen is a fibrous proteind) In collagen three helices come together to form a triple helix8. Which of the following CANNOT make a H-bond. More than one can be circled.a) N-HO=Cb) N…H-O-HⒸ)C=O....N-Cd)C=O....H-O-9. Which of the following statements describes an apoenzyme?a) the place where a substrate bindsb) an apoenzyme is an organic molecule that an enzyme needs to function correctlyan apoenzyme is an enzyme that does not have its cofactor and therefore is not functioningit describes a theory on how substrates and enzymes interact.

The primary structure of the protein is a polypeptide sequence formed by the linking of amino acids.…

Answered: 4. Which of the following polypeptides…

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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Nucleoside triphosphates ... a) are synthesized from nucleoside monophosphates using the energy of ATP hydrolysis. b) always contain the nitrogenous base adenine. c) lose their two terminal phosphates in exergonic polymerization reactions that form nucleic acids. d) a and c e) a, b and c
Consider the synthesis of a polypeptide by a ribosome of a prokaryote cell. As the polymerization of amino acids to form a polypeptide chain occurs and the molecule is still completely linear, what is the level of structure in the protein? a) primary, b) secondary, c) tertiary, d) quaternary, e) Because they are ionic, they only form crystals.
1. When a protein is attached with ubiquitin it is targeted for one of the following? a) For degradation b)For packaging c)For exocitosis d)To be stored 2. A covalent bond between a negatively charge chemical and the side chain of a protein occurs in one of the following? a) Between the allosteric modulator and the regulatory site b) In the functional site of a protein c) During the process of cooperativity among proteins d)When a phosphorus group is attached to a OH group by a protein kinase
The major secondary structure seen in collagen is: a) alpha helix b) beta sheet c) collagen helix d) random coil or nonrepetitive The major secondary structure seen in hemoglobin is: a) alpha helix b) beta sheet c) collagen helix d) random coil or nonrepetitive Although all of these play a part in protein folding, the one which contributes the most is: a) salt bridges b) hydrogen bonds c) Van der Waals interactions d) hydrophobic effect
(a) In what important ways do the α helix and β sheet structures differ? (b) How are they similar?
Lamin polypeptides (nuclear lamina) form dimers in which the central α-helical regions of two polypeptide chains are wound around each other. This is called a coiled coil. a) True b) False
1. What is the isoelectric point (pI) of lysine which has pKa values of 2.1 for the α carboxyl group, 9.7 for the α amino group and 10.5 for the side chain amino group? 2. Which of the following is most likely to be found on the exterior of a protein? A) Pro B) Trp C) Ser D) Glu 3. The type of reaction that forms a peptide bond is A) Elimination B) Hydrolysis C) Nucleophilic substitution D) Condensation
1. The stability of an a-helix is not affected by which of the following? a) Bulkiness b) Occurrence of alanine and glycine residues c) Electrostatic repulsion d) Interaction between R groups spaced three residues apart
Imagine that a mutation has been discovered in the HBA1 gene, where amino acid residue # 1 in the alpha subunit is changed from valine to lysine. The structure of these two amino acids is shown below. How would this mutation affect the mobility of HbA in the gel?a) HbA with this mutation would have the same mobility as normal HbAb) HbA with this mutation would have the same mobility as HbSc) HbA with this mutation would have a faster mobility than normal HbA O d) HbA with this mutation would have a mobility somewhere in between HbS and normal HbA
Which of the following has (have) both a favorable hydrogen bonding pattern and o and values that fall within the allowed Ramachandran conformational regions? A) a helix B) collagen helix C) B sheet D) all of the above E) none of the above
9) Which statement is inaccurate (wrong) about mRNA? A) it is double stranded and has thymine B) it can leave the nucleus C) It is single stranded and has uracil D) It is shorter than DNA 10) Which statemment accurately describes DDNA?
What is the CORRECT way to classify the protein below according to its secondary- structure elements? un a) not possible to determine b) all a ○ c) alẞ Od) a + B e) all B

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4. Which of the following polypeptides is capable of forming the most stable alpha helix? a) EEEEEE at pH 7 b) KKKKKKK at pH 7 CEEEEEE at pH 2 d) KKKKKK at pH 2 e) PPPPPP at pH 7 5/6. Explain your answer to the previous question.