solution is( et interaction below associated with the strongest force in aqueous
ID: 208142 • Letter: S
Question
solution is( et interaction below associated with the strongest force in aqueous solution is dipole a. b. hydrophobic interactions c. hydrogen bonding d. van der Waals forces 3. Hydrogen bonds can only form when the hydrogen atom is involved in a polar bond. (2pt) a. True b. False 14. The amino and carboxyl groups of amino acids are bonded to which carbon? (2 pt) a. Both are bonded to the a-carbon b Both are bonded to the -carbon c. The amino is bonded to the a-carbon, and the carboxyl is bonded to the B-carbon. d, The amino is bonded to the -carbon, and the carboxyl is bonded to the a-carbon. 15. The side chain groups of amino acids are bonded to which carbon? (2 pt) a. The a-carbon. b. The -carbon. c. The carbonyl carbon d. Different amino acids have their side chains attached to different carbons. 16. The amino acids which occur in proteins2 pt) a are all of the L-form. b. are all of the D-form. c. can be either the L-or D- form. d. do not have L-and D-forms 17. Which amino acid would have the greatest negative charge at pH7 0 (2 pt) a. Glutamic Acid b. Histidine c. Isoleucine d. Serine 18. Which of the following amino acids has a net charge of +1 at pH 4 and a net charge of O at pH 8? (2 pt) a. Glu b. Va c. HisExplanation / Answer
1. Hydrogen bond
13 True
14.A. Both are bonded to alpha carbon.
The amino and carboxyl group of amino acids are bonded to the
alpha group of the carbon.
15.A. Alpha carbon
16. A. All of the L-form
17. Glutamic acid - It only has two carboxyl group
at pKA value at 2.19 and 4.23.
So it release its H+ from COOH and makes COO-.
18. His.
His has 2 NH3+ group and one COOH group at pH =0
At pH 2.5 C-terminal cooH release its H+ and becomes coo-. so net charge becomes +1.
pKa of His 6.8 so it release it H+ from NH3+ to NH2 at pH8. so now we only have one NH3+ and cOO-. Net charge = o
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