Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Which of the following characterize -helix regions of proteins? (A) They all have the same primary structure. (B) They are formed principally by hydrogen bonds between a carbonyl oxygen atom in one peptide bond and the amide hydrogen from a different peptide bond. (C) They are formed principally by hydrogen bonds between a carbonyl atom in one peptide bond and the hydrogen atoms on the side chain of another amino acid. (D) They are formed by hydrogen bonding between two adjacent amino acids in the primary sequence. (E) They require a high content of proline and glycine
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- Which protein structure is due to interactions between amino acid side-chains? tertiary, quaternary, secondary, or primary?arrow_forwardDescribe the four levels of protein structure and what kind of forces create each level of structure?arrow_forwardWould the peptide group be planar if the amino group of amino acids was bonded to the β carbon of the amino acid, rather than to the α carbon?arrow_forward
- 17.arrow_forwardAttach an amino acid with the “-SH” functional group below. (not super long answers please) What is the name of the -SH functional group? What level of protein structure is determined by these amino acids? Explainarrow_forward1. 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) Condensationarrow_forward
- 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 structurearrow_forwardHaving peptides arranged in a beta sheet would be an example of a secondary structure A) True B) Falsearrow_forwarda helix and B pleated sheets are what protein structure? primary, tertiary, secondary, or quaternary?arrow_forward
- β-pleated sheets and α-helices arise more from interactions in the peptide backbone than from the “R” groups of the individual monomers; they are examples of the (????) structure of a protein. Primary Tertiary Secondary Quaternary (????) are comprised of a nitrogenous base, a pentose sugar, and a phosphate group. Monosaccharides Amino acids Proteins Nucleotides (????) is the RNA transcript of the DNA sequence that determines the primary structure of a protein. mRNA lncRNA tRNA rRNA If a substance such as a lipid isn’t soluble in water it might be described as (????) Hydrophilic Hydrophobicarrow_forwardΦ and ψ in the Ramachandran plot (below) are: a) Rotational angles around the bond between the α-carbon and N-H (Φ) and C=O (ψ). b) Amino acid solubility in octanol (Φ) and water (ψ). c) Hydrogen bond angles in α-helices (Φ) and β-sheets (ψ). d) Amino acid solubility in water (Φ) and octanol (ψ).arrow_forwardWhat 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 Carrow_forward
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