karyotype KAR-ee-o-type A size-order chart of chromosomes. 286
keratin KERR-a-tin A hard protein that accumulates in the integument of many animals and forms specialized structures. 594
kidneys Paired organs consisting of millions of tubules that excrete nitrogenous waste and regulate water levels. 780
kilocalorie KIL-o-KAL-o-ree (kcal) The energy required to raise 1 kilogram of water 1 degree Celsius. 755
kinase KI-nase A type of enzyme that activates other proteins by adding a phosphate. 177
kinetic energy kin-ET-ik EN-er-gee The energy of motion. 112
Krebs cycle KREBS SI-kle The stage in cellular respiration that completely metabolizes the products of glycolysis. 127
K-selection A form of natural selection in which individuals are long-lived, late-maturing, and have few offspring that they intensively care for. Density-dependent factors regulate these populations. 844
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