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a baseline group used to reference back to when comparing results of experiment to original group
positive feedback loop
a closed system, response of the system relies on the feedback signal to function
consists of one or more similar atoms in an element; in a compound it is two or more different atoms
a form of a given element that has the same number of protons, but a different number of neutrons
cellular organism that has: no nuclear membrane, no organelles in the cytoplasm except ribosomes, and genetic material is in the form of single continuous strands forming coils or loops
specialized organelles in cytoplasm, membrane bound nucleus enclosing genetic material organized into chromosomes, system of division by mitosis or meiosis
basic physical unit of heredity; linear sequence of nucleotides along segment of DNA, which provides instructions for synthesis of RNA, translates into proteins, > character
several species of the same chemical element with different masses whose nuclei are unstable, dissipate excess energy by emitting radiation in the form of alpha, beta, and gamma rays
time required for 1/2 of the atoms of a given amount of a radioactive substance to disintegrate
splitting of an atomic nucleus into almost equal parts, usually with an associated release of energy
1st Law of thermodynamics
when heat flows to or from a system, the system gains or loses an amount of energy equal to the amount of heat transferred
(heat added= incr. internal energy + external work by system)
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