Which of the following statements correctly describes the fi

Which of the following statements correctly describes the figure below? The a helix and beta sheet secondary structures of protein molecules. The R side chains bonded to a-carbons are numbered is a left-handed a helix and (B) is a parallel beta sheet. is a right-handed a helix and (B) is a parallel beta sheet. is a left-handed a helix and (B) is an anti-parallel beta sheet. is a right-handed a helix and (B) is an anti-parallel beta sheet. None of the statements is correct. How many water molecules are produced as a side product when you synthesize a hexapeptide from the following individual amino acids? 1 times Tyr, 2 times Gly, 3 times Glu 0 1 3 5 The number of water molecules formed cannot be determined.

Solution

1. Alpha helix and Beta sheets are the two conformations of the protein structure. Alpha helix is of two types: right handed alpha helix and left handed based on its coiling. Beta sheets are also of two types: parallel and antiparallel. In parallel beta sheets, the polypeptide strands run in the same direction from C-terminus to N-terminus while in the antiparallel beta sheets polypeptide strands run in opposite directions.

The correct answer is option C.

2. The correct answer is option D. Whenever a peptide bond is formed, water molecule is released as a side product. In the formation of hexapeptide, five peptide bond are formed, so for each peptide bond formed one water molecule is released.