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Nucleic acids were first discovered in 1868 by Friedrich Miescher, [13] and by 1939, RNA had been implicated in protein synthesis. [14] Two decades later, Francis Crick predicted a functional RNA component which mediated translation; he reasoned that RNA is better suited to base-pair with an mRNA transcript than a pure polypeptide.
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Tests that judge the test taker based on a set standard (e.g., everyone should be able to run one kilometre in less than five minutes) are criterion-referenced tests. The goal of a criterion-referenced test is to find out whether the individual can run as fast as the test giver wants, not to find out whether the individual is faster or slower ...