the 20th letter of the Roman alphabet
a square used by draftsmen to draw parallel lines
scientific instrument used by psychologists; presents visual stimuli for brief exposures
a circuit consisting of a T-network with an additional shunt bridging the two series circuits
thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer
the 20th letter of the Roman alphabet
hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells
a unit of weight equivalent to 1000 kilograms
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine
