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Appendix 2: Answers to Review QuestionsThe following are suggested answers to the review questions at the end of chapters in Physical Geology. Answers to the exercises are provided in Appendix 3. Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter
15
Chapter 16
Chapter 17
Chapter 18
Chapter 19
Chapter 20
Chapter 21
Chapter 22
How did simple organic molecules form on primitive Earth?The first organic molecules formed about 4 billion years ago. This may have happened when lightning sparked chemical reactions in Earth's early atmosphere. RNA may have been the first organic molecule to form as well as the basis of early life.
What was formed during the second stage in the origin of life?Second stage of the origin of life: oscillating prebiotic microsystem at the balanced bifurcate state. The period of a bifurcate transition is characterized by the appearance of two opposite forces in a system. They strive to turn the development of the system into the opposed states.
What was called the early cell that eventually gave rise to all subsequent life on Earth *?However, scientists think that only one early cell (or group of cells) eventually gave rise to all subsequent life on Earth. That one cell is called the Last Universal Common Ancestor (LUCA). It probably existed around 3.5 billion years ago. LUCA was one of the earliest prokaryotic cells.
Which macromolecule forms the foundation for the structure and activities of living cells multiple choice question?Nucleic acids are the most important macromolecules for the continuity of life. They carry the genetic blueprint of a cell and carry instructions for the functioning of the cell.
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