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- Alpha-helix of proteins, its characteristics. Draw a diagram of the arrangement of amino acids in the alpha helix. Examples of proteins formed mainly by this structure.Peptide bond properties. How these properties determine the three-dimensional structure of the protein.Optical isomerism of amino acids. L and D amino acids. Chiral centers of amino acids. Give examples of amino acids that do not have optical isomers.
- Long explanations are not needed. Answers and brief descriptions would be enough. During the formation of the peptide bond which of the following takes place? a. Hydrogen atom is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from the amino group of another amino acid. b. Hydrogen atom is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from the amino group of another amino acid. c. Hydroxyl group is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from the amino group of another amino acid. d. Hydroxyl group is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from the amino group of another amino acid.olive oil. Question 29 The sequence of amino acids in a protein is its structure. primary secondary tertiary quaternary hepternaryA 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 water
- Formation of the tertiary structure of a protein - what are the main physical forces affecting the assembly of the tertiary structure of proteins. The chemical compounds formed during the assembly of the tertiary structure of a protein.TRUE or FALSE. If false, write the word/s that make(s) the statement incorrect. 1. The Kozak sequence can be found 10 bases before the start codon. 2. Simultaneous transcription and translation occurs in prokaryotes only.Protein folding with PDI and Peptidyl-prolyl isomerase
- 7 Protein structure.Circle one of the three amino acid sequences that is most likely to form a stable a-helix? RASKTARQ DASKTAEQ KPGKPAGQ In one sentence (that can be accompanied by a small picture) explain why?Peptides. 1. Draw the peptide Ala-Glu-Gly-Lys, as it would occur at physiological pH = 7.4. The R groups of Ala and Gly are not acidic or basic, therefore do not have a pka and the charge on these R groups is therefore independent of pH. Glu is acidic and Lys is basic, therefore the charge on these amino acids is pH dependent. The pKas are shown below. pKa N-term = 9.0 C-term = 3.5 Glu4.1 Lys = 10.5 2. Draw a circle around the peptide bonds. 3. Label the C-terminus and the N-terminus. 4. What is the overall charge on the peptide at pH 7.4?Shape and dimension. (a) Tropomyosin, a 70-kDa muscle protein, is a two-stranded α-helical coiled coil. Estimate the length of the molecule. (b) Suppose that a 40-residue segment of a protein folds into a two-stranded antiparallel β structure with a 4-residue hairpin turn. What is the longest dimension of this motif?