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K![]() |
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K-selection |
The concept that in certain (K-selected) populations, life history is centered around producing relatively few offspring that have a good chance of survival. |
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karyogamy |
The fusion of nuclei of two cells, as part of syngamy. |
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karyokinesis |
Division of the nucleus during the cell cycle. |
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karyotype (kar-ee-oh-type) [Gk. kara, the head + typos, stamp or print] |
A method of organizing the chromosomes of a cell in relation to number, size, and type. |
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keratin [Gk. karas, horn] |
One of a group of tough, fibrous proteins formed by certain epidermal tissues and especially abundant in skin, claws, hair, feathers, and hooves. |
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keystone predator |
A predatory species that helps maintain species richness in a community by reducing the density of populations of the best competitors so that populations of less competitive species are maintained. |
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keystone species |
A species that is of exceptional importance in maintaining the species diversity of a community; when a keystone species is lost, the diversity of the community decreases and its structure is significantly altered. |
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kidney |
In vertebrates, the organ that regulates the balance of water and solutes in the blood and the excretion of nitrogenous wastes in the form of urine. |
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kilocalorie (kcal) |
A thousand calories; the amount of heat energy required to raise the temperature of 1 kg of water 1°C. |
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kin selection |
A phenomenon of inclusive fitness, used to explain altruistic behavior between related individuals. |
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kinesis (kih-nee-sis) |
A change in activity rate in response to a stimulus. |
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kinetic energy (kih-net-ik) [Gk. kinetikos, putting in motion] |
The energy of motion, which is directly related to the speed of that motion. Moving matter does work by transferring some of its kinetic energy to other matter. |
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kinetochore (kih-net-oh-kor) [Gk. kinetikos, putting in motion + choros, chorus] |
A specialized region on the centromere that links each sister chromatid to the mitotic spindle. |
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kingdom |
A taxonomic category, the second broadest after domain. |
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Koch's postulates |
A set of four criteria for determining whether a specific pathogen is the cause of a disease. |
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Krebs cycle |
A chemical cycle involving eight steps that completes the metabolic breakdown of glucose molecules to carbon dioxide; occurs within the mitochondrion; the second major stage in cellular respiration. |
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
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Glossary from Biology, Fifth Edition By Campbell, Reece, Mitchell © 1998, Benjamin Cummings. Reprinted with Permission. All Rights Reserved |