A7_Seno_Cristopher

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Adventist University of Health Sciences *

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Biology

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Feb 20, 2024

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Assignment 7 Answer Sheet The questions for your assignment come from your lecture notes and textbook readings (Chapter 7). Please provide your answers to the assigned questions on this answer sheet. Make sure you rename the file as your last name, followed by your first name, and A7 (i.e. Lastname_firstnameA7.xxx). Worth 20 points 1. In the cycling of energy and carbon through living things, plants and some other organisms use CO2 to make carbon-containing molecules, while other organisms break down those molecules and release CO2. During this process, CO2 is produced during ________ and used during ________. (1pt) A. cellular respiration; photosynthesis B. cellular respiration; photosynthesis and cellular respiration C. photosynthesis; cellular respiration D. photosynthesis; photosynthesis E. cellular respiration; cellular respiration 2. a) What is the advantage of being a C4 or CAM plant? (1.5pts) The advantage of being a C4 or CAM plant is its ability to survive in hot and dry environments. b) In what environments would these types of plants have a selective advantage, and why? (1.5pts) These types of plants would have a selective advantage in environments with high temperatures and limited water availability. This is because C4 and CAM plants have special adaptations that allow them to properly use water and minimize water loss through transpiration. 3. During which stage of photosynthesis are water molecules split and what is released as a by-product? (1pt) Water molecules are split during the light-dependent reactions of photosynthesis. The by- product released during this stage is oxygen gas. 4. The equation for photosynthesis is: 6 CO 2 + 6 H 2 O → C 6 H 12 O 6 + 6 O 2 a. Where does the water come from in the equation? (2pts) The water used in photosynthesis is typically obtained by the plant's roots from the soil or absorbed from the surrounding environment, such as rainfall or irrigation. b. Where does the carbon dioxide come from? (1pt) The carbon dioxide required for photosynthesis is primarily obtained by plants from the atmosphere, where it is present in relatively low concentrations. 5. a. How many turns of the calvin cycle occur? (0.5pts) In the Calvin cycle, there are three turns that occur

b. Where are the H+ ions transported in the ETC during photosynthesis? (0.5pts) H+ ions are transported across the thylakoid membrane of the chloroplasts in the electron transport chain 6. a. Where in a plant does photosynthesis occur? (0.5pts) chloroplasts of plant cells b. What is the purpose of the light reactions in photosynthesis? (1pt) The purpose of the light reactions in photosynthesis is to turn light energy into chemical energy, specifically ATP and NADPH, which are used in the following dark reactions to produce glucose 7. True or False: A photoautotroph is a type of heterotroph that uses solar energy to produce sugars. If false, make this statement correct. (1pt) False, because photoautotroph is actually a type of autotroph that uses solar energy to produce sugars through the process of photosynthesis 8. A toxin is found to inhibit uptake of carbon dioxide into plant leaves. This toxin would most directly affect the _______. (1pt) a. light reactions b. splitting of water c. Calvin cycle d. absorption of solar E 9. What links photosystem I with photosystem II? (0.5pts) a. products of dark reactions b. electron transport chain c. creation of oxygen gas d fixation of carbon dioxide 10. The Calvin cycle is cyclic because: (1pt) a. CO2 constantly acquired during carbon fixation b. it constantly makes G3P c. RuBP regenerated in the final chemical reaction d. NADPH /ATP used from light reactions 11. Complete the following table that compares photosynthesis with cellular respiration (answer with Yes or No): (4pts) Photosynthesis Cellular Respiration CO2 reduced in this process Yes No Glucose becomes oxidized No Yes Overall process is exergonic Yes Yes

Overall process is endergonic Yes Yes 12. The two complexes of pigments that constitute a photosystem include antenna complex and the reaction center . (2pts)

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