RNA World MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
Quick Facts
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13 Questions around this concept.
Solve by difficulty
EASYGiven below are two statements:
Statement 1: In the RNA world, RNA is considered the first genetic material to evolve to carry out essential life processes. RNA acts as a genetic material and also as a catalyst for some important biochemical reactions in living systems. Being reactive, RNA is unstable.
Statement II: DNA evolved from RNA and is a more stable genetic material. Its double helical strands being complementary, it resists changes by evolving a repairing mechanism.
In light of the above statements, choose the most appropriate answer from the options given below:
Concepts Covered - 1
RNA World
- Early living cells were RNA life-forms. A number of facts suggest that heredity was originally based on RNA rather than on DNA.
- There is now enough evidence to suggest that essential life processes (such as metabolism, translation, splicing, etc.), evolved around RNA.
- RNA used to act as a genetic material as well as a catalyst (there are some important biochemical reactions in living systems that are catalyzed by RNA catalysts and not by protein enzymes).
- But, RNA being a catalyst was reactive and hence unstable.
- Therefore, DNA has evolved from RNA with chemical modifications that make it more stable.
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