Question

rna-first hypothesis ii which statement is not true about the rna-first hypothesis? multiple choice it says that first rna, then dna, and then proteins would have been necessary to interact in the chemical evolution that would have led to the development of the first cells. it is supported by the discovery that rna can act as an enzyme. it suggests that there was an rna world about 4 billion years ago. it is supported by the fact that some viruses have rna as their genetic material.

Explanation:

1. Analyze Option 1: The RNA - first hypothesis proposes that RNA was the first genetic material, and the idea of RNA, then DNA, then proteins in chemical evolution is consistent with it. So this statement is true.
2. Analyze Option 2: The discovery of ribozymes (RNA acting as enzymes) supports the RNA - first hypothesis as it shows RNA can have catalytic activity, which is important for early life processes. So this statement is true.
3. Analyze Option 3: The RNA - first hypothesis suggests an "RNA world" in the early history of life, around 4 billion years ago is a reasonable time frame for this early stage. So this statement is true.
4. Analyze Option 4: Viruses having RNA as genetic material does not support the RNA - first hypothesis. The RNA - first hypothesis is about the origin of life's genetic material in the pre - cellular world, while viruses are parasitic entities that evolved later. So this statement is NOT true.

Answer:

The option "It is supported by the fact that some viruses have RNA as their genetic material." (the fourth option in the list)