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21 Cards in this Set
- Front
- Back
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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
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karst topography
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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
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karyotype
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keratin a hard protein that forms hair, bird feathers, nails, and horns
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keratin
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ketone an organic compound in which a carbonyl group is attached to two alkyl groups; obtained by the oxidation of secondary alcohols
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ketone
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kettle a bowl-shaped depression in a glacial drift deposit
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kettle
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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
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keystone species
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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
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kidney
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kilocalorie a unit of energy equal to 1,000 cal
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kilocalorie
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kinetic energy the energy of an object that is due to the object's motion
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kinetic energy
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the force that opposes the movement of two surfaces that are in contact and are sliding over each other
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kinetic friction
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kinetic-molecular theor a theory that explains that the behavior of physical systems depends on the combined actions of the molecules constituting the system
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kinetic-molecular theory
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kinetochore a structure that is found on the surface of the centromere and that attaches the chromosomes to the mitotic spindle
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kinetochore
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kingdom the highest taxonomic category, which contains a group of similar phyla
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kingdom
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kin selection a mechanism for increasing the frequency of one's genes in a population by helping increase the reproductive success of relatives
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kin selection
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Koch's postulates a four-stage procedure that Robert Koch formulated for identifying specific pathogens and determining the cause of a given disease
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Koch's postulates
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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
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Krebs cycle
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krill a small marine crustacean that is the main food source of the baleen whale
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krill
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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
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K-strategist
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Kuiper belta region of the solar system that is just beyond the orbit of Neptune and that contains small bodies made mostly of ice
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Kuiper belt
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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
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Kuiper belt object
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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
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Kyoto Protocol
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