Examlex
Relative to the secondary structure of DNA, the purine and pyrimidine bases lie inside the helix, in planes perpendicular to the helical axis; the deoxyribose and phosphate groups form the outside of the helix.
Representative Sample
A segment of a population that faithfully reflects the traits of the whole community.
Random Selection
A method of choosing individuals or items from a larger population using a process that gives each possible choice an equal chance of being selected.
Lab Rats
Commonly used term for rats that are bred and kept for scientific research.
Scientific Method
A systematic and logical approach to discovering how things in the universe work, based on observation, hypothesis, experimentation, and conclusion.
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