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Earth’s biota were believed to be relative simple, slow-
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- Earth’s biota were believed to be relative simple, slow-metabolizing life. During what era is this?Using the analogy of a one-hour countdown timer, when did prokaryotes originate? When did the colonization of land occur?choose the correct answer 1) What do the banded formations in marine sediments indicate? A. Early cyanobacteria probably were producing oxygen when the sediment was deposited. B. Purple sulfur bacteria were the dominant life form in the seas during that time. D. The pH value of the early seas was quite low due to the excretion of organic acids from the fermentation by prokaryotes. C. The early atmosphere was very reducing. 2) Which of the following is not evidence that chloroplasts and mitochondria originated as prokaryotic endosymbionts of larger cells? A. They contain circular DNA molecules not associated with proteins. B. Their membranes have enzymes and transport systems that resemble those found on the plasma membranes of prokaryotes. D. Their ribosomal RNA is more similar to that of eubacteria than to the RNA of ribosomes in the eukaryotic cytoplasm. C. They contain their own genome and produce all their own…
- For most part of our planet’s history, organisms are microbial. Explain why this is the case?Which sequence of events accurately describes the history of the planet (from oldest to youngest)? Eukaryotes appear, Oxygen increases in the atmosphere, Prokaryotes appear, Oxygen increases in the atmosphere, Eukaryotes appear, Prokaryotes appear Prokaryotes appear, Oxygen increases in the atmosphere, Eukaryotes appear Prokaryotes appear, Eukaryotes appear, Oxygen increases in the atmosphereWhy was the development of enzymes fundamental to the evolution of life? a) without enzymes, the activation energy for essential reactions was too low b) enzymes allowed for high rate of catalysis at relatively low temperatures c) enzymes reduced the cellular demand for ATP d) enzymes allowed for reactions to occur spontaneously
- Cyanobacteria was responsible for the increase in oxygen levels billions of years ago. They play a decisive role in changing the earth’s environment. Explain how are Cyanobacteria related in changing the early earth’s environment which later suitable for the development of other organisms.Life originated from the earth’s inorganic atmosphere in the post, but this no longer happens today. Give two reasons?Around the time Eukaryotic Cells began to compartmentalize their reactions, and the chloroplast and mitochondria evolved, the atmosphere went through a shift in composition. A new deadly gas became more and more prominent, which likely caused a mass extinction for those organisms that couldn't adapt to its toxicity. The gas was: Nitrogen Sulfuric Acid Oxygen Methane
- Which statement best explains why a third domain, Archaea, was added to the original two domains of Bacteria and Eukarya?What effect did the events describe endosymbiotic theory have on eukaryotic energy production?The first organisms that oxygenated the atmosphere were ______. a. cyanobacteria b. phootrophic organisms c. anaerobic organisms d. allof the above