Which of the following is primarily responsible for stabilizing the a-helix, a type of1.secondary structure formed by a single nolvpeptide chain?hydrophobic interactionshydrogen bonds of backboneionic interactionsdisulfide bridgeshydrogen bonds involving the R-side chainsa)b)atomsd)The atoms that make up the peptide bond that links amino acids together in a proteinare in the same plane (coplanar). In the a-helix, how are these peptide bond planesarranged?2.a)perpendicular to the a-helixapproximately parallel to a-helix axisb)both parallel and perpendicular to the a-helixrandomly oriented with respect to the axis of the a-helixpeptide bond planes don't exist in the a-helix

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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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16.
1) If the pH of the rain drops from 6 to 5 due to air pollution, the rain has become: a) two time more acidic b) four-time more acidic c) ten time more acidic d) one thousand times more acidic 2) which of combination of statement is correct ? the denaturation of protein 1- causes changes in tertiary structure 2- is always an irreversible process 3-has no influence on the solubility 4-occurs only by interaction with heavy metals 5-does not influence covalent bonds and hydrogen bonds select one: a) only 1 is correct b) only 1 and 2 are correct c) only 3 and 4 are correct d) only 3, 4 and 5 are correct e) only 1, 2 and 5 are correct
Draw a diagram to illustrate the locations of the omega (w), phi (p), and psi (4) rotational bond angles for an amino acid residue in a polypeptide chain (make all rotational bond angles = 180 degrees).
1. Which best describes the contribution of primary (1’) structure of polypeptides to the native conformation of proteins: a) Structure that results from intrachain interactions of amino acid side chains b) Structure that results from interchain interactions of amino acid side chains c) Structure that results from base pairing d) Structure that results from the linear sequence of amino acids from beginning to end of molecule.
17.
Within a naturally-occurring polypeptide, under neutral pH conditions (pH = 7.0), which of the following amino acids always has a positively charged amine group? (Choose one answer) the first amino acid in the primary structure histidine lysine arginine the last amino acid in the primary structure
Which of the following levels of protein structure can involve covalent bond formation? A) Primary B) Secondary C) Teritary D) Quaternary E) Primary and teritary F) Primary, teritary and quaternary
When phospholipids are carefully mixed with water they are observed to exhibit which of the following properties? a) Spontaneous organization into stable structures within the water environment, b) Orientation of the Phosphate parts of the molecule away from fatty acid (non-polar) environment of a bilayer, c) Hydrophilic orientation of the ionic section of the phospholipid molecules to the polar portions of the water molecules, d) All are true, e) None are true.
What type of bonds/forces stabilize protein secondary structure? A) ionic (electrostatic) B) hydrogen bonds C) hydrophobic forces D) A and C O E) A, B and C
Consider an alpha-helix comprised of twelve amino acid residues. How many hydrogen bonds should be formed between backbone atoms in this helix?
Peptide bonds cannot rotate. This is because: a) the amino acid side chains are too bulky to allow this. B) Internal hydrogen bonding hinders rotation. C) interaction with water molecules hinders rotation D) the peptide bond has considerable double bond character Polypeptide chains prefer the trans conformation. This is because: a) This distances hydrophilic groups from hydrophobic groups b) this minimizes crowding of side chains c) This brings hydrophilic groups in contact with water molecules d) This allows proteins to fold more easily Ramachandran plots indicate that protein conformation is largely a function of: a) hydrophobicity b) number of amino acids c) torsion angles d) arrangement of prosthetic groups
Which of the following bases are found in RNA choose all that apply

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Which of the following is primarily responsible for stabilizing the a-helix, a type of secondary structure formed by a single polypeptide chain? 1. hydrophobic interactions hydrogen bonds of backbone atoms ionic interactions disulfide bridges hydrogen bonds involving the R-side chains a) b) d) e)