20. Alpha helices and beta strands are the most commonly found types of protein
ID: 144021 • Letter: 2
Question
20. Alpha helices and beta strands are the most commonly found types of protein primary structure. false terminus, 10he dipeptide pKas: N-terminus, 3.3; His imidazole, 6.4; Cys thiol, 7.8; C. d. 7.I .8.9 22. Which of the following prote a. A (Mr 45,344) b. B (Mr 36,666) c. C (Mr 89,122) d. D (Mr 14,547) e. E (Mr 10,925) ins would emerge first from a Sephadex G200 gel filtration column? 23. A plo t of InKeq vs. I/T is a van't Hoff plot. It can be AH for a reaction n't Hoff plot. It can be used to determine a. b. AS° for a reaction c. Go for a reaction d. All of the above e. None of the above 24. The only standard amino acid that is not an L. amino acid is a. cysteine b. glycine c. serine d. tryptophan e. valine 25. Which of the following is an ammonium group a. NH b.-NH2 c. NH2 d.-NH e. -NH3 26. The AG° for the reaction below is -29 kJ/mol at 37° C. What is the Gibbs free energy change for t reaction if all reactants are 10 mM and all products are 20 mM? R is 8.31 J/K-mol A+BC+D a. -22 kJ/mol b. -26 kJ/mol c.-34 kJ/mol d. -37 kJ/mol e. -40 kJ/molExplanation / Answer
20. True
Because these alpha helix and beta structures are seen in the secondary structures of protein.
21. Answer is 7.1
For this type of questions when it is asked to find the PI the formula is (pk1+ pKr/2).
6.4+7.8/2
= 14.2/2
=7.1
24. Glycine. Because it does not have any side chains.
25. Ammonium group: option E.
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