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

question 145

Multiple Choice

What is wrong with this diagram of secondary structure in a polypeptide chain? (Hint: In the representation of ? 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 ? sheet.
• C) ? sheets cannot form when the arrows are pointed in the same direction.
• D)Nothing is wrong with the diagram.

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Definitions:

Prions

Infectious agents composed entirely of a protein material that can fold in multiple, structurally abstract ways, at least one of which is transmissible to other prion proteins, leading to disease.

Neurological Diseases

Disorders or conditions affecting the nervous system, including the brain, spinal cord, and peripheral nerves, manifesting in various cognitive, sensory, and motor dysfunctions.

Coup Effects

Injuries to the brain occurring under the site of impact with an object, part of the broader phenomenon including both coup and contrecoup injuries in head traumas.

Contrecoup Effects

Refers to injuries that occur on the side of the brain opposite to where an impact occurs, typically associated with traumatic brain injuries.