Question

______ proposed that polypeptides and rna evolved simultaneously.
mutiple choice

thomas cech

sidney fox

graham cairns - smith

stanley miller

aleksander oparin

Explanation:

To solve this, we recall the contributions of each scientist:

• Thomas Cech discovered catalytic RNA (ribozymes), not the co - evolution of polypeptides and RNA.
• Sidney Fox worked on proteinoids and microspheres, related to protein - like structures in origin of life, not the co - evolution of polypeptides and RNA.
• Graham Cairns - Smith proposed that polypeptides and RNA evolved simultaneously (his theory on the origin of life involving the co - evolution of these molecules).
• Stanley Miller conducted the Miller - Urey experiment on abiotic synthesis of organic compounds, not about co - evolution of polypeptides and RNA.
• Aleksander Oparin proposed the primordial soup theory, not the co - evolution of polypeptides and RNA.

Answer:

C. Graham Cairns - Smith