Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 25.1, Problem 2CC
How would the appearance of protocells have repre-sented a key Step in the origin of life?
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Direct evidence of life on early Earth comes from fossils of microorganisms that lived 3.5 billion years ago. But how did the first living cells appear?
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Why is RNA likely to have been pivotal in life’s beginnings?
Chapter 25 Solutions
Campbell Biology
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 - Prob. 3CCCh. 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 - Prob. 5TYUCh. 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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- In 40 words or fewer, explain why we think that RNA, and not DNA, was the hereditary material in the first protocell.arrow_forwardWhy were cyanobacteria so important in the evolution of life onEarth?arrow_forwardWhich of the following steps has not yet been accomplished byscientists studying the origin of life?(A) synthesis of small RNA polymers by ribozymes(B) formation of molecular aggregates with selectivelypermeable membranes(C) formation of protocells that use DNA to direct thepolymerization of amino acids(D) abiotic synthesis of organic moleculesarrow_forward
- In what way was the evolution of eukaryotic cells linked to the increase in the oxygen concentration in the atmosphere that occurred during the Precambrian?arrow_forwardHow did scientist think the first life may have evolved on earth?arrow_forwardPlease, need help with the explanation of the answer: During Chemical Evolution, what would one expect to find inside the protocell? a) Water mixed with many non-polar molecules. b) Fatty Acids mixed with non-polar molecules. c) a wide variety of different ionic and polar covalent molecules dissolved in water. d) Functioning proteins. E) Living single-celled organismsarrow_forward
- The formation of the first living organism is still a mystery. Outline and explain the steps in the origin of life. Explain where the original organisms must have lived and why?arrow_forwardThe video game “Spore” invites players to design creatures and guidethem through “five stages of evolution.” Search the Internet forinformation about “Spore”; describe how evolution in this game issimilar to, and different from, the evolution of life on Earth.arrow_forwardWith regard to the origin of life, why are biologistsinterested in the prebiotic synthesis of organic molecules?arrow_forward
- Here is the question: What was the likely source of the raw material incorporated into the first life forms? I believe it is carbon, but I don't know why it is carbon. What I mean is, why is carbon considered the thing that makes something alive? Why are eukaryotes and prokaryotes simply considered alive just because they have carbon. Would that mean that carbon is alive because carbon has carbon? I would appreciate an anwser because I'm really trying to understand everything I run across. I love educating myself and I'm on a quest for knowledge. Thanks guys!arrow_forwardWould the following ancestral cell have been a prokaryote or an early eukaryote? Briefly explain your answer.arrow_forwardWhat is the correct order of appearance in the fossil record, starting with the earliest: eukaryotic cells, multicellular organisms, prokaryotic cells?arrow_forward
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