Biology: Concepts and Investigations
5th Edition
ISBN: 9781260259049
Author: Hoefnagels
Publisher: MCG
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Textbook Question
Chapter 17, Problem 6WIO
Ecosystems rely on nitrogen -fixing bacteria, which convert atmospheric nitrogen (N2) into ammonium (NH4+). Into what types of organic molecules do plants incorporate the nitrogen in ammonia?
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What is nitrogen fixation?what are proteins involved?how do they participate in fixation nitrogen
Why is nitrogen important to living things? What type of organism is responsible for making nitrogen available to plants?
Refer to the figure. To identify the molecule that accepts CO2, Calvin and Benson manipulated the carbon fixation cycle by either cutting off CO2 or cutting off light from cultures of photosynthetic algae. They then measured the concentrations of various metabolites immediately following the manipulation. How would these experiments help identify the CO2 acceptor?
a) The CO2 acceptor concentration would decrease when either the CO2 or light is cut off.
b)The CO2 acceptor concentration would decrease when the CO2 is cut off but increase when the light is cut off.
c)The CO2 acceptor concentration would stay the same regardless of the CO2 or light.
d)The CO2 acceptor concentration would increase when either the CO2 or light is cut off.
e)The CO2 acceptor concentration would increase when the CO2 is cut off but decrease when the light is cut off.
Chapter 17 Solutions
Biology: Concepts and Investigations
Ch. 17.1 - What are two domains that contain prokaryotes?Ch. 17.1 - Prob. 2MCCh. 17.1 - Prob. 3MCCh. 17.1 - Prob. 4MCCh. 17.2 - Prob. 1MCCh. 17.2 - Prob. 2MCCh. 17.2 - What does the Gram stain reveal about a cell?Ch. 17.2 - Prob. 4MCCh. 17.2 - Prob. 5MCCh. 17.2 - How are molecular data changing microbial...
Ch. 17.2 - Prob. 7MCCh. 17.3 - Prob. 1MCCh. 17.3 - Prob. 2MCCh. 17.3 - Prob. 3MCCh. 17.4 - Prob. 1MCCh. 17.4 - Prob. 2MCCh. 17.4 - What adaptations enable pathogenic bacteria to...Ch. 17.4 - What are some practical uses of bacteria and...Ch. 17.5 - Prob. 1MCCh. 17.5 - Prob. 2MCCh. 17 - A prokaryotic cell is one that a. lacks DNA. b....Ch. 17 - Which of these is a distinguishing characteristic...Ch. 17 - What feature distinguishes the cell walls of...Ch. 17 - Prob. 4MCQCh. 17 - Prob. 5MCQCh. 17 - Prob. 6MCQCh. 17 - Prob. 7MCQCh. 17 - Prob. 8MCQCh. 17 - Explain why the antibiotics penicillin and...Ch. 17 - Give five examples that illustrate how bacteria...Ch. 17 - If you were developing a new "broad-spectrum"...Ch. 17 - Ernst Mayr defined a biological species as a...Ch. 17 - In an article in Nature magazine, Sean Nee wrote...Ch. 17 - Ecosystems rely on nitrogen -fixing bacteria,...Ch. 17 - Prob. 7WIOCh. 17 - Prob. 8WIOCh. 17 - Prob. 9WIOCh. 17 - Prob. 10WIOCh. 17 - Mycobacterium tuberculosis causes most cases of...Ch. 17 - Prob. 1PITCh. 17 - Add autotrophs, heterotrophs, phototrophs, and...Ch. 17 - Prob. 3PITCh. 17 - Prob. 4PITCh. 17 - Prob. 5PIT
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Why is nitrogen a limiting nutrient for so many organisms, and what is it used for? (consider the four types of organic molecules)arrow_forwardThe following four chemicals commonly found in defined growth media contain all of the necessary atomic macronutrients, namely C, O, N, H, S and P, which microbes require: glucose (C6H12O6), K2HPO4, MgSO4.7H2O, and (NH4)HPO4. Part a. Create a simple diagram to map which growth media chemical contributes atoms to which of the four biological macromolecules (amino acids, polysaccharides, lipids, and ribonucleic acids). Part b. Consider a cell culture broth that originally (before inoculation with cells) contains 5.0 gr/L glucose (C6H12O6), 1.2 gr/L K2HPO4, 0.3 gr/L MgSO4∙7H2O, and 1.0 gr/L (NH4)HPO4. Create a table showing how much of each of the different atoms (C, H, O, K, P, Mg, S, N) are available for incorporation into cell macromolecules (assume 50% of the glucose is catabolized, while the remainder goes for energy (respiration). Express your answers with units of grams of atomic species / liter of culture broth.arrow_forwardWhy is energy required for nutrient transport? Give an example of a system that transports nutrients and describe what source of energy is used to move the nutrients into the cell. Why can’t most organisms use the nitrogen gas that is so prevalent in the atmosphere? How do these organisms acquire a usable form of nitrogen?arrow_forward
- Given that the bottom of the ocean is anaerobic, what process in the nitrogen cycle is likely to be occurring in this location?arrow_forwardWhy are nitrogen-fixing bacteria ecologically important? Why are humans interested in nitrogen-fixing bacteria? (Economic applications?)arrow_forwardWhat are the symptoms of nitrogen deficiency? In which form nitrogen has been provided in media? Usually lower levels of NH4+ is provided than NO3- Why?arrow_forward
- What is the most abundant form under which nitrogen is found in nature?arrow_forwardWhat is nitrogen assimilation? What is the acceptor molecule? What does it react with? What is the product?arrow_forwardUse the multiple choice questions to identify what components of the redox loop would have to be in each numbered box for this organism to be able to produce ATP using this system. Do not worry about stoichiometry. a) What should be in box 1? MQ MQH2 Electron H+ b) What should be in box 2? MQ MQH2 Electron H+ c) What should be in box 3? MQ MQH2 Electron H+ d) What should be in box 4? MQ MQH2 Electron H+ e) What should be in box 5? MQ MQH2 Electron H+ f) What should be in box 6? MQ MQH2 Electron H+ g) What should be in box 7? MQ MQH2 Electron H+ h) What should be in box 8? MQ MQH2 Electron H+ i) Which boxes in the diagram directly result in increasing the pH gradient? (select all that apply) 1 2 3 4 5 6 7 8arrow_forward
- To identify the molecule that accepts CO2, Calvin and Benson manipulated the carbon-fixation cycle by either cutting off CO2 or cutting off light from cultures of photosynthetic algae. They then measured the concentrations of various metabolites immediately following the manipulation. How would these experiments help identify the CO2 acceptor? Select one: a. The CO2 acceptor concentration would decrease when the CO2 is cut off, but increase when the light is cut off. b. The CO2 acceptor concentration would increase when the CO2 is cut off, but decrease when the light is cut off. c. The CO2 acceptor concentration would decrease when either the CO2 or light are cut off. d. The CO2 acceptor concentration would increase when either the CO2 or light are cut off.arrow_forwardExtremophiles are microorganisms that can survive and proliferate in extreme environments. One group of such microorganisms are lithotrophs. These are found deep beneath the Earth's surface, living on rocks under anaerobic conditions and surviving on CO2 as their sole source of carbon. Imagine that you are studying a newly discovered lithotroph and are trying to determine what it uses as a source of electrons for reducing CO2 and for producing energy. Which one of the following conditions must be met for a molecule to serve as a useful electron donor? Oxidation of the molecule occurs with a decrease in free energy. Oxidation of the molecule occurs with an increase in free energy. Reduction of the molecule occurs with a decrease in free energy. O Reduction of the molecule occurs with an increase in free energy.arrow_forwardWhy must nitrogen fixation occur in an anoxic (i.e., oxygen-free) environment? a)Because H2 is an additional product of nitrogen fixation, and the combination of H2 and O2 would cause the cell to combust. b)Oxygen poisons the dinitrogenase enzyme by entering the FeMo cluster c)Oxygen competes as an electron acceptor in the ETC, so electrons cannot be passed to N2. d)Oxygen "steals" electrons from the dinitrogenase reductase, producing free radicals.arrow_forward
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