Questions from Organic Chemistry

Q: The 20 naturally occurring amino acids (Table 25.1)

The 20 naturally occurring amino acids (Table 25.1) are all L amino acids, and they all have the S configuration, with the exception of glycine (which lacks a chiral center) and cysteine. Naturally oc...

Q: Nitriles undergo alkylation at the α position much like ketones undergo alkylation

Nitriles undergo alkylation at the α position much like ketones undergo alkylation at the α position. The α position of the nitrile is first deprotonated to...

Q: Draw a Fischer projection for each of the following amino acids:

Draw a Fischer projection for each of the following amino acids: a. L-Threonine b. L-Serine c. L-Phenylalanine d. L-Asparagine

Q: Seventeen of the 20 naturally occurring amino acids exhibit exactly one chiral

Seventeen of the 20 naturally occurring amino acids exhibit exactly one chiral center. Of the remaining three amino acids, glycine has no chiral center, and the other two amino acids each have two chi...

Q: Draw all stereoisomers of L-isoleucine. In each stereoisomer,

Draw all stereoisomers of L-isoleucine. In each stereoisomer, assign the configuration (R or S) of all chiral centers

Q: Arginine is the most basic of the 20 naturally occurring amino acids

Arginine is the most basic of the 20 naturally occurring amino acids. At physiological pH, the side chain of arginine is protonated. Identify which nitrogen atom in the side chain is protonated. (Hin...

Q: Histidine possesses a basic side chain that is protonated at physiological pH

Histidine possesses a basic side chain that is protonated at physiological pH. Identify which nitrogen atom in the side chain is protonated.

Q: Draw the form of L-glutamic acid that predominates at each

Draw the form of L-glutamic acid that predominates at each pH: a. 1.9 b. 2.4 c. 5.8 d. 10.4

Q: For each of the following amino acids, draw the form that

For each of the following amino acids, draw the form that is expected to predominate at physiological pH: a. L-Isoleucine b. L-Tryptophan c. L-Glutamine d. L-Glutamic acid

Q: Using the data in Table 25.2, calculate the p

Using the data in Table 25.2, calculate the p of the following amino acids: a. L-Alanine b. L-Asparagine c. L-Histidine d. L-Glutamic acid From Table 25.2: