Question

Chapter 25

1.Identify each of the following statements as TRUE or FALSE.

a.The oldest rocks on Earth provide evidence that the early oceans were a “primitive soup” of organic molecules.

b.Protobionts may form spontaneously under laboratory conditions from mixtures of organic molecules.

c.The atmosphere of early Earth contained little or no free oxygen.

2. Which of the following statements supports the hypothesis of an RNA world? Select all correct answers.

a.Single-stranded RNA molecules can assume a variety of three-dimensional shapes specified by their nucleotide sequences.

b.Some RNA molecules are important catalysts in modern cells.

c.The oldest known fossils contain traces of RNA molecules

Answer 1

Answer 1:- A. True. B. True. C True.

Answer 2:- a , b