Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 24.4, Problem 2CC
WHAT IF? What would the discovery of a bacterial species that is a methanogen imply about the evolution of the methane-producing pathway?
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Q1: What are the products of cellular respiration? Q2: Considering the inputs and products of each process, why is cellular respiration considered the reciprocal process to photosynthesis? Q3: Which of the three stages of cellular respiration—glycolysis, the Krebs cycle, or oxidative phosphorylation—could organisms have used 4 billion years ago, before photosynthesis by cyanobacteria released oxygen into the atmosphere?
Although chemoautotrophs serve as the primary producers near hydrothermal vents, animals there still ultimately depend on the photosynthetic activities of plants and cyanobacteria. Why?
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Chapter 24 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 24.1 - What hypothesis did Miller test in his classic...Ch. 24.1 - How would the appearance of protocells have...Ch. 24.1 - Prob. 3CCCh. 24.1 - Prob. 4CCCh. 24.2 - Contrast the cellular and DNA structures of...Ch. 24.2 - Distinguish between the four major modes of...Ch. 24.2 - Prob. 3CCCh. 24.2 - Prob. 4CCCh. 24.3 - Although rare on a per gene basis, new mutations...Ch. 24.3 - Distinguish between the three mechanisms by which...
Ch. 24.3 - In a rapidly changing environment, which bacterial...Ch. 24.3 - WHAT IF? If a nonpathogenic bacterium were to...Ch. 24.4 - Explain how molecular systematics and metagenomics...Ch. 24.4 - WHAT IF? What would the discovery of a bacterial...Ch. 24.5 - Explain how prokaryotes, though small, can be...Ch. 24.5 - Prob. 2CCCh. 24.5 - Prob. 3CCCh. 24.5 - Prob. 4CCCh. 24 - Which of the following steps has not yet been...Ch. 24 - Fossilized stromatolites A. more than 2.8 billion...Ch. 24 - Prob. 3TYUCh. 24 - Photoautotrophs use A. light as an energy source...Ch. 24 - Which of the following statements is not true? A....Ch. 24 - Prob. 6TYUCh. 24 - Plantlike photosynthesis that releases O2 occurs...Ch. 24 - SCIENTIFIC INQUIRY INTERPRET THE DATA The...Ch. 24 - FOCUS ON EVOLUTION In patients infected with...Ch. 24 - FOCUS ON ENERGY AND MATTER In a short essay (about...Ch. 24 - Prob. 11TYU
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- Please answer all questionsarrow_forward. The photosynthetic process used by the green sulfur bacteria, under anaerobic conditions, is best represented by which of the following balanced equations? 6CO2 + 12H2S g C6H12O6 + 6S2 + 6H2O C6H12O6 + C6H12O6 g C12H22O11 + H2O 6CO2 + 12H2O g C6H12O6 + 6O2 + 6H2O C12H22O11 + H2O g C6H12O6 + C6H12O6 C6H12O6 + 6O2 + 6H2O g 6CO2 + 12H2Oarrow_forwardWhy is an isotonic buffered extraction medium used to isolate the chloroplasts? 1.To gently lyse the chloroplasts, leaving the electron transport membranes intact, whilst allowing DCPIP access 2.To maintain a constant acidic pH and favourable hyper-osmotic conditions, to ensure that the chloroplasts remained intact and functional during extraction 3.To gently separate the chloroplasts from each other, leaving the electron transport membranes intact, whilst allowing DCPIP access 4.To maintain a constant physiological pH and favourable iso-osmotic conditions, to ensure that the chloroplasts remained intact and functional during extraction.arrow_forward
- Table 4 Gross productivity (mg/L/hr) Net productivity (mg/L/hr) Test tube % Light 2.38 1.52 100% -1.41 2 | -2.28 -3.62 - 3.89 -3.96 3 65% 25% .17 4 -0.95 -.17 10% 6. 2% LOarrow_forwardProvide the balanced chemical reaction for cellular respiration.arrow_forwardAnswer all the following questions briefly and concisely 1. Where does photosynthesis occur in a phototrophic eukaryote? 2.Why would a bacteria that uses photosynthetic processes have various colors? 3. How can fermentation be used to distinguish between different microorganism types? 4. How are routes for glucose metabolism connected to the byproducts of lipid and protein degradation? 5. Why would a living thing choose to engage in cyclic phosphorylation as opposed to noncyclic phosphorylation? 6. What role do photosynthetic pigments play in the complex that captures light? 7. Why are autotrophic organisms required to fix CO2 and also respire or ferment in addition to this?arrow_forward
- WHAT IF? In the absence of O2, as in question 1, whatdo you think would happen if you decreased the pH ofthe intermembrane space of the mitochondrion? Explainyour answerarrow_forwardMAKE CONNECTIONS As noted in Figure 52.15, theaddition of nutrients to a lake can cause an algal bloom.When these algae die, complex molecules in their bodiesare broken down by decomposers using aerobic respiration. Explain why this would reduce the lake’s oxygenlevels (see Concept 9.1)arrow_forward1. What are the products of photosynthesis? 2 What are the reactants of cellular respiration? 3. Why do we need nitrogen fixing bacteria? 4. List at least 2 reasons why living things need nitrogen.arrow_forward
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