7. Where do amino acids reside ?

Polar side chains tend to be present on the surface of a protein where they can interact with the aqueous environment found in cells. On the other hand, non-polar amino acids tend to reside within the center of the protein where they can interact with similar non-polar neighbors.

Explanation:BRAINLIST :D

icc, international association for cereal chemistry

there is none because earth is stationary and flat.