Answered: a) With the above scenario in mind,…

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter13: Early Life Forms And The Viruses

Section: Chapter Questions

Problem 2SQ

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Presumably in the first billion years of the Earth’s existence, there were many chemical reactions occurring and some of these reactions formed large quantities of organic molecules that accumulated in the early oceans, lakes, etc. This is often referred to as the “primordial ooze” or “prebiotic soup.” The conditions of the early Earth changed so new organic molecules weren’t being made, however many of the molecules in the primordial ooze reacted together forming more complex molecules and even, after millions of years, primitive cells formed. For energy, these primitive cells could metabolize some of the remaining organic molecules and “eat” other cells. At some point millions of years later, photosynthetic bacteria developed, but note that these bacteria did not give off O2. Then more millions of years later, the Cyanobacteria (the Blue-Green Bacteria) evolved and these organisms could photosynthesize and they gave off O2.

a) With the above scenario in mind, discuss the significance (to life on earth) of the original development of photosynthesis in some bacteria (withoutO2formation) .(6)
b) Discuss the significance of the Blue-Greens and the production of O2. (Keep in mind that this was long before Eukaryotes developed.)

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