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21 Cards in this Set

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  • Back
karst topography a type of irregular topography that is characterized by caverns, sinkholes, and underground drainage and that forms on limestone or other soluble rock
karst topography
karyotype an array of the chromosomes found in an individual’s cells at metaphase of mitosis and arranged in homologous pairs and in order of diminishing size
keratin a hard protein that forms hair, bird feathers, nails, and horns
ketone an organic compound in which a carbonyl group is attached to two alkyl groups; obtained by the oxidation of secondary alcohols
kettle a bowl-shaped depression in a glacial drift deposit
keystone species a species that is critical to the functioning of the ecosystem in which it lives because it affects the survival and abundance of many other species in its community
keystone species
kidney one of the organs that filter water and wastes from the blood, excrete products as urine, and regulate the concentration of certain substances in the blood
kilocalorie a unit of energy equal to 1,000 cal
kinetic energy the energy of an object that is due to the object's motion
kinetic energy
the force that opposes the movement of two surfaces that are in contact and are sliding over each other
kinetic friction
kinetic-molecular theor a theory that explains that the behavior of physical systems depends on the combined actions of the molecules constituting the system
kinetic-molecular theory
kinetochore a structure that is found on the surface of the centromere and that attaches the chromosomes to the mitotic spindle
kingdom the highest taxonomic category, which contains a group of similar phyla
kin selection a mechanism for increasing the frequency of one's genes in a population by helping increase the reproductive success of relatives
kin selection
Koch's postulates a four-stage procedure that Robert Koch formulated for identifying specific pathogens and determining the cause of a given disease
Koch's postulates
Krebs cycle a series of biochemical reactions that convert pyruvic acid into carbon dioxide and water; it is the major pathway of oxidation in animal, bacterial, and plant cells, and it releases energy
Krebs cycle
krill a small marine crustacean that is the main food source of the baleen whale
K-strategist a species characterized by slow maturation, few young, slow population growth, reproduction late in life, and a population density near the carrying capacity of the environment
Kuiper belta region of the solar system that is just beyond the orbit of Neptune and that contains small bodies made mostly of ice
Kuiper belt
Kuiper belt objectone of the hundreds or thousands of minor planet–sized objects that orbit the sun in a flat belt beyond Neptune's orbit
Kuiper belt object
Kyoto Protocol an international treaty according to which developed countries that signed the treaty agree to reduce their emissions of carbon dioxide and other gases that may contribute to global warming by 2012
Kyoto Protocol