Which of the following amino acids can form 2 H-bonds within an alpha helix?
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- Below is the structure of glycine. Draw a tripeptide composed exclusively of glycine. Label the N-terminus and C-terminus. Draw a box around the peptide bonds.How long is a fully extended peptide chain that contains the same number of amino acids?(The distance between consecutive amino acids in a fully extended chain is 3.5 Å; the repeat distance ofan a-helix is 5.4 Å.)Which of the following statements are true? The local folding of the polypeptide in some regions gives rise to the secondary structure of the protein. The most common secondary structures are the α-helix and β-pleated sheet structures. Certain amino acids have a propensity to form an α-helix, while others have a propensity to form a β-pleated sheet. Select the correct answer below: 1 and 2 1 and 3 2 and 3 all of the above
- Which of the following amino acids is unique in that it can bind both non-specifically to the DNA backbone as well as to specific DNA bases? a) Lysine b) Asparagine c) Arginine d) Phenylalanine e) LeucineWhich of the following most accurately describes the anticodon? A. Contains a sequence complementary to the codon. B. Reintroduces thymine back into the sequence and removes uracil. C. Contains the sequence in the reverse orientation (3-5 vs 5-3). D. Contains a sequence identical to the codon.Which amino acid is most likely to have a net positive charge at a pH of 7.4? A) Histidine B) Cysteine C) Arginine D) Serine
- The structural polarity of a polypeptide chain I. is determined by its N- or C-terminus. II. is determined by the distribution of electrons between atoms. III. determines the chemical properties of the amino acids. IV. determines which end the polypeptide grows during translation.Which of the following peptides will likely adopt an alpha helix? H-I-R-E-F A-D-L-E-E A-D-E-L-E C-V-D-E-FIn the alpha-helices, which of the following statement is NOT true? a. Backbone carbonyl oxygen of residue (i) hydrogen bonds to backbone NH of the fourth residue of chain of residue (i + 4). b. Side chains project out from an α-helix. c. Hydrogen bonds are almost straight and parallel to the helix axis. d. Helix has a macrodipole. e. The rise or advance per amino acid residue is 0.54 nm.
- Which of the following is/are least likely to be found in an alpha helix because it has an inappropriate Phi angle. a Polar charged amino acids b Proline c Nonpolar amino acids d Glycine e Polar uncharged amino acidsIn RNA, an atypical base pair is able to form between guanine and uracil. This base pair allows a single tRNA molecule to recognize more than one codon using its one anticodon sequence. It requires a shift in position of the two nucleotides. Guanine and uracil come together in this unusual pair via 2 hydrogen bonds. Based on what you know about hydrogen bond formation and base pairing draw a guanine nucleotide and a uracil nucleotide hydrogen bound to one another.In DNA the nucleic acid bases form hydrogen bonds between them, which are responsible for the formation of the double-stranded helix. A hydrogen bond donor is defined as any hydrogen atom that can participate in a hydrogen bond, whereas a hydrogen bond acceptor is defined as any atom that can “receive” that hydrogen atom to form a hydrogen bond. How many hydrogen bond acceptors does guanine (shown below) have? a) 3, b) 5 c) 4 d) 6 e) 7