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The correct answer is b. The Central Dogma states that DNA is transcribed into mRNA which is then translated into proteins. It clearly shows the purpose of RNA (to make proteins) and DNA (to make RNA). It also explains what is needed to make proteins. However, the linear flow doesn’t explain how DNA is created. We know that proteins are required for DNA synthesis. Scientists also hypothesize that RNA might have been the first genetic material, which DNA evolved from.
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