What is wrong with this diagram of secondary structure in a polypeptide chain? (Hint: In the representation of $\beta$ sheets as paired arrows, the convention is that the amino end is at the base of the arrow and the carboxyl end is at the tip.)

A)It has an amino end and a carboxyl end.
B)The directionality of the polypeptide chain reverses orientation between the arrows representing a $\beta$ sheet.
C)$\beta$ sheets cannot form when the arrows are pointed in the same direction.
D)Nothing is wrong with the diagram.

Question

What is wrong with this diagram of secondary structure in a polypeptide chain? (Hint: In the representation of $\beta$ sheets as paired arrows, the convention is that the amino end is at the base of the arrow and the carboxyl end is at the tip.)

A)It has an amino end and a carboxyl end. 
B)The directionality of the polypeptide chain reverses orientation between the arrows representing a $\beta$ sheet. 
C)$\beta$ sheets cannot form when the arrows are pointed in the same direction. 
D)Nothing is wrong with the diagram.

Quizplus · Accepted Answer

The directionality of the polypeptide chain should remain consistent throughout the diagram, but it reverses orientation between the arrows representing a β sheet. This is incorrect as the arrows should be oriented in the same direction to correctly represent a β sheet.

What Is Wrong with This Diagram of Secondary Structure in a Polypeptide