Origin of life
- Given below are two statements :Statement I : In the RNA world, RNA is considered the first genetic material evolved to carry out essential life processes. RNA acts as a genetic material and also as a catalyst for some important biochemical reactions… Answer: 1. Both statement I and statement II are correct Key idea: Both statements describe the RNA world idea correctly. Statement I: RNA w... 1
- From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask : Answer: 1. CH₄ , H₂ , NH₃ and water vapor at 800°C Key idea: Miller used the gases thought to be in the early atmosphere. He mixed CH₄ , H₂... 1
- Which of the following is the correct sequence of events in the origin of life?I. Formation of protobiontsII. Synthesis of organic monomersIII. Synthesis of organic polymersIV. Formation of DNA-based genetic systems Answer: 2. II, III, I, IV The chemical evolution order is: Synthesis of organic monomers (II). Synthesis of organic polymers (III). Formatio... 1
- Following are the two statements regarding the origin of life :(a) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.(b) The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of th… Answer: 3. Both (a) and (b) are correct. Both statements are correct. Life began in an oxygen-free atmosphere, so the first cells were non-g... 1