Origins of Life: Pre-cellular Forms — NEET Biology
📚 Practice ConceptWe have no idea about how the first self replicating metabolic capsule of life arose. The first non-cellular forms of life could have originated 3 billion years back. They would have been giant molecules (RNA, Protein,
Which of the following statements are correct? 1. RNA world hypothesis suggests RNA acted as both genetic material and catalyst in early life. 2. DNA, though chemically more stable, is believed to have evolved later from RNA. 3. The presence of thymine instead of uracil in DNA increases its stability. 4. Evolutionary evidence suggests first life forms were cellular organisms present 3 billion years ago. 5. Fossil evidence shows that first non-cellular forms of life were proteins and polysaccharides.
View solution & NCERT explanation
Correct answer: C — 1, 2, 3, 4 only
RNA world is accepted as origin of life, but first forms were non-cellular (RNA, protein, etc.), not proteins alone. Thymine provides DNA additional stability. Evolution places cellular life ~3 billion years ago.
What does NCERT say about We have no idea?
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