CAMPBELL BIO ETXT+ACCESS >IC<
11th Edition
ISBN: 9781323770689
Author: Reece
Publisher: PEARSON C
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Chapter 25, Problem 5TYU
Which of the following steps has not yet been accomplished by scientists studying the origin of life?
- (A) synthesis of small RNA
polymers by ribozymes - (B) formation of molecular aggregates with selectively permeable membranes
(C) formation of protocells that use DNA to direct the
(D) abiotic synthesis of organic molecules
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Chapter 25 Solutions
CAMPBELL BIO ETXT+ACCESS >IC<
Ch. 25.1 - What hypothesis did Miller test in his classic...Ch. 25.1 - How would the appearance of protocells have...Ch. 25.1 - MAKE CONNECTIONS In changing from an "RNA world"...Ch. 25.2 - Describe an example from the fossil record that...Ch. 25.2 - WHAT IF? Your measurements indicate that a...Ch. 25.3 - The first appearance of free oxygen in the...Ch. 25.3 - What evidence supports the hypothesis that...Ch. 25.3 - WHAT IF? What would a fossil record of life today...Ch. 25.4 - Explain the consequences of plate tectonics for...Ch. 25.4 - What factors promote adaptive radiations?
Ch. 25.4 - Prob. 3CCCh. 25.5 - Explain how new body forms can originate by...Ch. 25.5 - Why is it likely that Hox genes have played a...Ch. 25.5 - MAKE CONNECTIONS Given that changes in morphology...Ch. 25.6 - How can the Darwinian concept of descent with...Ch. 25.6 - Prob. 2CCCh. 25 - Describe the roles that montmorillonite clay and...Ch. 25 - What are the challenges of estimating the ages of...Ch. 25 - What is the "Cambrian explosion," and why is it...Ch. 25 - Explain how the broad evolutionary changes seen in...Ch. 25 - How could changes in a Single gene or DNA region...Ch. 25 - Explain the reasoning behind the Statement...Ch. 25 - Level 1: Knowledge/Comprehension 1. Fossilized...Ch. 25 - The oxygen revolution changed Earth's environment...Ch. 25 - Prob. 3TYUCh. 25 - Prob. 4TYUCh. 25 - Which of the following steps has not yet been...Ch. 25 - Prob. 6TYUCh. 25 - Prob. 7TYUCh. 25 - EVOLUTION CONNECTION Describe how gene flow,...Ch. 25 - Prob. 9TYUCh. 25 - WRITE ABOUT A THEME: ORGANIZATION You have seen...Ch. 25 - Prob. 11TYU
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- What is the name of the evolution where carbon, oxygen, nitrogen were formed?arrow_forwardWhich of the following questions about the origin of life on Earth is most scientifically testable? * Why were the earliest life-forms created using only twenty amino acids? Did life originate to make the universe a better place? Was catalytic RNA used by ancient organisms as a stepping stone to acquire protein enzymes? Can simple organic molecules form spontaneously in an oxygen-free atmosphere?arrow_forwardAre the three methods/hypotheses of producing the building blocks of life on earth mutually exclusive? Why or why not? Is there evidence that supports all three proposed mechanismsarrow_forward
- What evidence would you look for on Enceladus, Europa or Mars that would tell you that life may have existed there in the past?arrow_forwardWithout an oxygen-free atmosphere, the organic compounds that started the story of life never would have been formed on their own. Free oxygen would have attacked them. Which probable stage of physical and chemical evolution of life is that?arrow_forward“What is the origin of life or the main ancestor of all organisms?”, what would be your answer and why?arrow_forward
- If living cells were produced in a test tube from nonbiological components by chemical processes, would this accomplishment prove that life evolved in asimilar manner billions of years ago? Explain your answer.arrow_forwardWhich molecule is believed to have preceded the other two during the evolution of life? RNA Proteins DNAarrow_forwardDescribe the step-wise process of how inorganic matter on primitive Earth evolved into multicellular, eukaryotic cells. Be sure to provide enough detail with each step and make sure you cover inorganic, organic, protocells, prokaryotic, energetics, eukaryotic, and multi-cellularityarrow_forward
- Why are scientists interested in the primordial synthesis of organic molecules when it comes to the genesis of life?arrow_forwardWhat experimentation has been done on finding the source of raw material for the first life on Earth? What has been discovered and by who?arrow_forwardName of the group of microorganisms that completely changed the evolution of life on Earth. - Why can we say that this group contributed to the delimitation of the limits of life? What is their ecological role? - How did these organisms contribute to the evolution of eukaryotic cells and metabolisms? - How did these organisms contribute to the establishment of life in extraterrestrial (out-of-water) environments?arrow_forward
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