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K+ leak channel A K+-transporting ion channel in the plasma membrane of
animals cells that remains open even in a "resting" cell.
karyotype Full set of chromosomes of a cell arranged with respect to size,
shape, and number.
keratin Member of the family of proteins that form keratin intermediate
filaments, mainly in epithelial cells. Specialized keratins are found in hair,
nails, and feathers.
ketone Organic molecule containing a carbonyl group linked to two alkyl
groups.
kilocalorie (kcal) Unit of heat energy equal to 1000 calories. Often used to
express the energy content of food or molecules: bond strengths, for example,
are measured in kcal/mole. An alternative unit in wide use is the kilojoule,
equal to 0.24 kcal.
kilojoule Standard unit of energy equal to 1000 joules, or 0.24 kilocalories.
kinesin One type of motor protein that uses the energy of ATP hydrolysis to
move along a microtubule.
kinetochore Complex structure formed from proteins on a mitotic
chromosome to which microtubules attach and which plays an active part in
the movement of chromosomes to the poles. The kinetochore forms on the part
of the chromosome known as the centromere.
kinetochore microtubule In a mitotic or meiotic spindle, a microtubule with
one end attached to the kinetochore on a chromosome.
Krebs cycle see citric acid cycle