1. Is DNA or RNA the better candidate for the first \"life\" on Earth? Please ex
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Question
1. Is DNA or RNA the better candidate for the first "life" on Earth? Please explain why the better candidate is better and why the less favored candidate is not as good: a. DNA: b. RNA: 2. Please fill in the following: Characteristic Pro/Eukaryotic Cell or Both Plant/Animal er Beth Ribosomes Peroxisomes Vacueles Cell Wall of Peptidoglycan Cell Wall of Cellulose Plasma Membrane 3. Please list two differences between bound ribosomes and free ribosomes: 4. Please name two characteristics that caused Fungi to be classified in their own kingdom (and explain why):Explanation / Answer
In 1960s, experiments showed that messenger RNA has the ability to store genetic information, while transfer and ribosomal RNA have the ability to translate genetic information into proteins. Experiments performed two decades later showed that some RNAs can even act as an enzyme to self-edit their own genetic code! These results raised two questions: 1) Why does RNA play so many roles in the flow of genetic information? 2) Why bother storing genetic information in DNA, if RNA alone could do the job?
RNA has great capability as a genetic molecule; it once had to carry on hereditary processes on its own. It now seems certain that RNA was the first molecule of heredity, so it evolved all the essential methods for storing and expressing genetic information before DNA came onto the scene. However, single-stranded RNA is rather unstable and is easily damaged by enzymes. By essentially doubling the existing RNA molecule, and using deoxyribose sugar instead of ribose, DNA evolved as a much more stable form to pass genetic information with accuracy.
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