Question

which of the following would most likely be key to gathering evidence that the rna world hypothesis is val
creation of suitable environments for long - term study of single - celled organisms
b simulation of early earth conditions and long - term study of the resulting molecules
c development of a system for studying the microspheres ability to absorb additional molecules
d categorization of the different specific conditions that result in the development of microspheres
question 5 (4 points)
(01.03 mc)
which of the following was most likely responsible for the fact that organic molecules no longer spontaneously form on earth?
the amount of uv radiation increased.
the amount of oxygen in the atmosphere increased.
water accumulated in the oceans.
earths surface temperature warmed.

Explanation:

For the first question, the RNA World hypothesis proposes that RNA was the first genetic material. To gather evidence for it, simulating early Earth conditions (where such processes might have occurred) and studying resulting molecules (to see if RNA - like molecules form or show relevant properties) is key. Single - celled organisms came after the RNA World stage (so option a is wrong). Microspheres are not directly related to the core of the RNA World hypothesis (options c and d are wrong).

For the second question, organic molecules could form spontaneously on early Earth because of a reducing atmosphere. When the amount of oxygen in the atmosphere increased (due to photosynthetic organisms), it became an oxidizing atmosphere. Oxidizing conditions are not conducive to the spontaneous formation of organic molecules (as they would react with oxygen). An increase in UV radiation would not stop organic molecule formation (as UV was present on early Earth and was even a factor in some organic molecule formation theories, so option a is wrong). Water accumulation in oceans (option c) and Earth's surface warming (option d) do not explain the cessation of organic molecule spontaneous formation.

Answer:

First question: B. Simulation of early Earth conditions and long - term study of the resulting molecules
Second question: B. The amount of oxygen in the atmosphere increased