Examlex
In classical conditioning, the stimulus that normally triggers a naturally occurring response is termed the unconditioned stimulus.
Sugar-Phosphate
Refers to the backbone of DNA and RNA, composed of alternating sugar and phosphate groups that hold together the nucleotide bases.
Ladder
A piece of equipment consisting of a series of bars or steps between two upright lengths of wood, metal, or rope, used for climbing up or down.
Radioactive Sulfur
A form of sulfur that contains isotopes capable of emitting radiation, often used in scientific research to trace chemical and biological processes.
Radioactive Phosphorus
A radioactive isotope of phosphorus, often used in medical and biological research to trace and study the behavior of phosphorus-containing compounds in organisms.
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