The amino acid that lacks a backbone NH for bond formation to backbone CO group (due to the presence of a ring structure) is a) Proline b) Histidine c) Phenylalanine d) Glycine
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The amino acid that lacks a backbone NH for bond formation to backbone CO group (due to the presence of a ring structure) is
a) Proline
b) Histidine
c) Phenylalanine
d) Glycine
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- Which of the following levels of protein structure may be affected by hydrogen bonding? (a) primary and secondary (b) primary and tertiary (c) secondary, tertiary, and quaternary (d) primary, secondary, and tertiary (e) primary, secondary, tertiary, and quaternaryWhich of the following group(s) can be found in both an amino acid and a protein? a. Rgroup (side chain) only b. Free amino group and carboxyl group c. Free amino group, free carboxyl group and R groups d. Carbonyl group and free amino group and R groupsWhich of the following does not contribute to the tertiary structure of protein? a. ionic interaction b. H-bond c. peptide bond d. hydrophobic interaction
- Which of the following pairs of amino acids can form hydrogen bonds between their side-chain groups? Draw the pairs that can hydrogen bond through their side chains and indicate the hydrogen bonds.(a) Phe, Thr (b) Asn, Ser (c) Thr, Tyr (d) Gly, TrpWhat type of bond is formed between the nucleotide monomers that is considered as the main stabilizing factor of primary structure of nucleic acid? A. Phosphodiester bond B. Glycosidic bond C. Nitrogen bond D. Hydrogen bondwhich of the following is correct about the structure of proteins? a- the number of peptide bonds is equivalent to the number of amino acid residues b- the secondary structure of proteins are mostly stabilized by hydrophobic interactions c- protiens mostly composed of polar amino acids will have an elongated (fibrous) tertiary structure d- the quaternary structure of a protein is formed between or among similar polypeptides only
- Which of the amino acids will nearly always be found buried in the center of proteins? a. aspartic acid b. arginine c. glycine d. phenylalanineA peptide bond... is a version of an ester bond is a version of an amide bond is the basis of protein secondary structure is formed by addition of waterWhat kind of bond would you expect between the side chains of the following amino acids?(a) Cysteine and cysteine(b) Alanine and leucine(c) Aspartic acid and asparagine(d) Serine and lysine
- Which of these are considered “part” of each amino acid? A. Carboxyl acid group B. All of the options are correct C. R Group D. Amino groupDraw a polypeptide chain with the following sequence of amino acids: M-A-N-A-N-D-G-E-N-EWhich one of the following types of bond is principally responsible for holding the α-helix shape of a protein secondary structure : A) peptide B) disulfide C) hydrogen D)ionic
