Knowing that hydrophilic amino acids tend to face outward on a protein that is folded into its three- dimensional state inside a cell allows you to deduce that the term "hydrophilic" means:

Affinity to water

Explanation:

Amino acids can be divided into two groups: non-polar and polar. The polar group consists of asp, glu, arg, lys, his, ser, thr and tyr. They can make hydrogen bonds and interact with water because they have an OH or NH2 group. This polarity affects the tertiary and quaternary structure of proteins because a polar molecule will tend to be on the outside because of its hydrophilic properties.

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