fat molecule; consists of three fatty acids linked to a glycerol molecule.

hair-like structure on the epidermal surface

one-way membranous flap of connective tissue between the atrium and the ventricle in the right side of the heart; also known as atrioventricular valve

thyroid hormone containing 3 iodines that controls the basal metabolic rate

animal that develops from three germ layers

otherwise diploid genotype in which one entire chromosome duplicates

first of the two larval stages in mollusks

position of a species or group of species in a food chain or a food web

energy transfer efficiency between two successive trophic levels

outer layer of cells in the blastocyst

acts to block myosin binding sites on actin molecules, preventing cross-bridge formation and preventing contraction until a muscle receives a neuron signal

binds to tropomyosin and helps to position it on the actin molecule, and also binds calcium ions

series of genes necessary to synthesize tryptophan in prokaryotic cells

pancreatic protease that breaks down protein

amino acid that can be synthesized by prokaryotic cells when necessary