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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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In 1-3 sentences, explain why a poison that inhibits an enzyme of the calvin cycle will also inhibit the light reaction?
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- What special adaptation has evolved in CAM plants such as cacti and stonecrops that allows CO2 fixation and the Calvin cycle to occur in the same cell, but still occur separately? Briefly describe how this separation of events works.arrow_forwardChlorophyll is the dominant pigment in photosynthetic cells, and degrades earlier than carotenoids in the fall. Select one: True Falsearrow_forwardDescribe the Calvin Cycle of Photosynthesis and its function. What are some of the products that can be made from the Calvin cycle? Explain how the enzyme ribulosebisphosphate carboxylase catalyzes a reaction (RuBisCo).arrow_forward
- A botanist brings you a plant that she has collected during her travels and asks you to determine the photosynthetic pathway the plant uses. You grow the plant in a special chamber on a 14:10-hour light/dark cycle and track the fate of radiolabeled CO2 in the plant over 24 hours. You begin monitoring the plant's photosynthetic activity at the beginning of the light portion of the cycle. You find that during the day, the plant's stomata remain closed, and an enzyme with a low affinity for CO2 slowly catalyzes the joining of CO2 and a five-carbon molecule in the plant's mesophyll cells. Once the chamber switches to the night cycle, the plant stomata open, and an enzyme with a high affinity for CO2 slowly catalyzes the joining of CO2 to a three-carbon molecule to produce a four-carbon molecule in the mesophyll cells. What photosynthetic pathway(s) does this plant use? Group of answer choices C4 Photorespiration CAM C3arrow_forwardWhich among the following statements is INCORRECT? The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule, which forms a six-carbon molecule that breaks down into two 3PG molecules. The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule, which is a reaction assisted by large quantities of RuBP carboxylase enzyme. The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule, which decreases cell carbon dioxide levels, which increases the diffusion gradient. The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule, which immediately becomes a six-carbon sugar that is the base for starch, sucrose, cellulose, etc.arrow_forwardExplain why inhibiting the oxidation of NADPH in the Calvin cycle will also inhibit the light reactions.arrow_forward
- Explain, using a simple diagram, the relationship between acyclic photophosphorylation (photophase) and the Calvin cycle (dark phase).arrow_forwardDuring which stage of the dark reaction or Calvin cycle is G3p produced?arrow_forwardThe most important result of the light-independent (or Calvin Cycle) reactions is: ??? the addition of phosphate to sugar to form sugar-phosphate the synthesis of sugar from CO2 the change of chlorophyll from green to colorless the transfer of electrons to glucose molecules the rearrangement of sugar molecules to form O2 from H2Oarrow_forward
- Which of the following approaches would be the best way to detect the lack of photosystem II in some photosynthetic organisms? Determine whether they have thylakoid membranes. Determine whether they consume CO2 in the dark. Determine whether they produce O2 in the light. Determine the action spectrum for photosynthesis in these organisms.arrow_forwardWhat is the name of the molecule that transports high energy electrons from the light reactions to the Calvin Cycle? ADP NAD ATP NADParrow_forwardYour friend is looking for advice for growing healthy houseplants. With what you read in the textbook about photosynthesis, provide your friend with three specific factors that are key to successful plant growth. Provide specific details as to why you chose these factors and how your friend can make sure the plants are able to maximize their photosynthetic rate.arrow_forward
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