Given below are two statements :
Statement I : In the RNA world, RNA is considered the first genetic material evolved 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, resist changes by evolving repairing mechanism.
In the light of the above statements, chocse the most appropriate answer from the options given below :
- A
Statement I is incorrect but statement II is correct
- B
Both statement I and statement II are correct
- C
Both statement I and statement II are incorrect
- D
Statement I is correct but statement II is incorrect
The “RNA world” hypothesis is well supported: RNA likely served as the first genetic material and also catalysed key biochemical reactions (ribozymes). Being chemically reactive, however, it is unstable — Statement I is correct.
DNA then evolved as a more stable, double-stranded molecule. Its complementary strands and DNA-repair mechanisms protect the genetic information — Statement II is correct as well.
Both statements are correct.
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