{karyotype}{}{A display of chromosomes arranged by pairs.}

{keratin}{}{A protein found in skin, hair, nails, and horns.}

{keratinocyte}{}{Epidermal cell that produces keratin.}

{kidney}{}{Organ of the urinary system that filters waste products out of the blood and maintains the correct water balance of the blood.}

{kinetic energy}{}{Motion energy or energy that can do work.}

{kinetochore}{}{Structure on chromosomes that attaches to spindle fibers in prometaphase of mitosis.}