Campbell Biology (11th Edition)
11th Edition
ISBN: 9780134093413
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 25.1, Problem 3CC
MAKE CONNECTIONS Ø In changing from an "RNA world" to today's "DNA world," genetic Information must have flowed from RNA to DNA. After reviewing Figures 17.4 and 19.9, suggest how this could have occurred. Does such a flow occur today?
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What is meant by the term RNA world? Describe observations andevidence that support this hypothesized period of life on Earth.
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Chapter 25 Solutions
Campbell Biology (11th Edition)
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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- Working on the Amazon River, a biologist isolated DNA from two unknown organisms, P and Q. He discovered that the adenine content of P was 15% and the cytosine content of Q was 42%. This means that: a. the amount of guanine in P is 15%. b. the amount of guanine and cytosine combined in P is 70%. c. the amount of adenine in Q is 42%. d. the amount of thymine in Q is 21%. e. it takes more energy to unwind the DNA of P than theDNA of Q.arrow_forwardDiscuss the following: “During the evolution of life on earth, RNA lost its glorious position as the first self- replicating catalyst. its role now is as a mere messenger in the information flow from DNA to protein.”arrow_forwardCalculate how many triplet codons would be possible had evolution seized on six bases (three complementary base pairs) rather than four bases with which to construct DNA. Would six bases accommodate a two-letter code, assuming 20 amino acids and start and stop codons?arrow_forward
- → 읊 https://openvellum.ecollege.com/course.html?courseld-15183778&HepID=fb9c...☆ @ Pearson Copyright O 2019 Pearson Education Inc. All rights reserved. | Terms of Use | Privacy Policy Permissions I Contact Usarrow_forwardGriffith, in his 1928 experiments, demonstrated that bacterial strains could be genetically transformed. The evidence that DNA was the transforming principle responsible for this phenomenon came later. What was the key experiment that Avery, MacCleod, and McCarty performed to prove that DNA was responsible for the genetic change from rough cells into smooth cells? Pls help explain this question asap!!arrow_forwardOn further analysis of the DNA described in conceptual questionC21, you discover that the triplex DNA in this alien organism iscomposed of a double helix with a third strand wound within themajor groove (just like the DNA in Figure shown). How would youpropose that this DNA is able to replicate itself? In your answer,be specific about the base-pairing rules within the double helixand which part of the triplex DNA would be replicated first.arrow_forward
- The genes for ribosomal RNA are highly conserved(relatively few sequence changes) in all organisms onEarth; thus, they have evolved very slowly over time. Wereribosomal RNA genes “born” perfect?arrow_forwardWhich of the following best explains the production of Okazaki fragments in replicating DNA (a) DNA is stressed when it unwinds (b) DNA is anti-parallel and can only be synthesized 5’ to 3’ (c) DNA contains once less oxygen in its sugar while RNA has an OH attached to its 2’ carbon (d) Template strands are complementary and have a tendency to reform hydrogen bonds (e) both a and darrow_forwardYou don't need the internet to exchange "gene-mail" with your friends, you have your own way to share the latest genes for things like antibiotic resistance. a. What is the structure being described? b. What is the chemical composition of this structure? c. What is the function of the structure, and how does it benefit the bacteria? I'm not getting this riddle.arrow_forward
- Which would have a greater effect on an organism’s genotype—mutation or horizontal gene transfer?arrow_forwardCompute the A+C:T or U ratios of your DNA and RNA models. Do you expect the same values for DNA and RNA? Why or why not? DNA: 5' ATGGCCTGAG 3' 3' TACCGGACTC 5' RNA: 5' AUGGCCUGAG 3'arrow_forwardWhat is so special about RNA that it is hypothe-sized to be an evolutionary precursor to DNA and protein?What is it about DNA that makes it a better material thanRNA for storage of genetic information?arrow_forward
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