Question

1. Which is a true statement about amino acids? a. They are amphiprotic b. The a-carbon has an ester attached c. They are symmetrical d. They are planar e. The α-carbon has a phosphate group attached 2. Which is an incorrect statement regarding the side chains of amino acids? a. Tryptophan, tyrosine, and phenylalanine contain an aromatic group. b. Isoleucine, and leucine are isomers of each other. c. Lysine and methionine contain an amine group. d. Threonine, serine, and tyrosine contain an alcohol group. e. Proline is the only one whose side chain forms a ring with the a-carbon. 3. Which structure is an accurate representation of a peptide? b. a. HAN-CH-C-O-N-CH-C-O-N-CH-C-OH H2NC CH-CH3 CH2 CH3 CH-CH3 CH CH3 CH2 CH-OH H-OH CH3 CH NH NH2 d. C. 0 0 H2 CH-OH CH-CH3 CH-OH CH-CH3 CH3 H2 CH3 CH3 NH2 NH2

Answer 1

Amino-acid: They are amphiprotic as they can accept & donate (n^+) both as they exist as z witch ion. For eg: In, methionine., Side chain contain not Nn_2 So, option C is in correct. \r\n Option d is correct representation it contains peptide linkage throughout. Propel representation of any peptide.