Adrawn bow possesses mechanical energy in the form of after the arrow is released, the energy is transformed into a) potential energy; mechanical energy b) elastic potential energy; kinetic energy c) gravitational potential energy; kinetic energy d) elastic kinetic energy; mechanical kinetic energy

The answer is B) Elastic potential energy; kinetic energy. 

This is true because with the elasticity of the bow being drawn, the arrow has the potential to be in motion. After released, the arrow is in motion, and is moving faster than its surroundings therefor it has kinetic energy which is dependent on its surroundings. 

Single strand binding protein by peptide bond