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Biotechnology › ViewWhat is the purpose of gel electrophoresis?
A. To cut DNA at specific recognition sites
B. To join fragments of DNA
C. To amplify DNA sequences
D. To separate DNA fragments according to size
Basic Structure of the Human Body › View
Two or more tissues that join together for a common purpose form a(n) _____.
A. cell group
B. organ
C. organ system
D. none of these