Rheumatoid Arthritis Symptoms In Women. Disorder that is believed to result from an autoimmune process in which the body's immune system attacks itself. It is a system-wide disease that usually last for many years. In some patients, RA affects such organs as the heart, lungs, and eyes.
The first organic molecules formed about 4 billion years ago. This may have happened when lightning sparked chemical reactions in Earthâs early atmosphere. RNA may have been the first organic molecule to form as well as the basis of early life. Explore More Use the time slider in this resource to answer the questions that follow.
RNA ON THE EARLY EARTH. According to the RNA World Hypothesis, RNA was a key molecule that was utilized by the earliest life on Earth to store genetic information and to catalyze chemical reactions. This raises the question, however, of how RNA formed under prebiotic conditions on the early Earth. In fact, the issue of the complete synthesis of RNA nucleotides has been a major stumbling block for the RNA World Hypothesis.