Which of the following best describes the products of the photochemical reactions of photosynthesis? A) NADH and ATP are made in the stroma B) NADPH and ATP are made in the stroma C) NADH and ATP are made in the thylakoid lumen D) NADPH is made in the stroma and ATP is made in the thylakoid lumen E) NADPH and ATP are made in the thylakoid lumen

Which of the following best describes the products of the photochemical reactions of photosynthesis? A) NADH and ATP are made in the stroma B) NADPH and ATP are made in the stroma C) NADH and ATP are made in the thylakoid lumen D) NADPH is made in the stroma and ATP is made in the thylakoid lumen E) NADPH and ATP are made in the thylakoid lumen

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter5: Photosynthesis

Section: Chapter Questions

Problem 12CTQ: What is the overall purpose of the light reactions in photosynthesis?

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Carbon dioxide is required for which of the following processes in photosynthesis? a) the Calvin cycle b) the splitting of water c) the absorption of water d) the production of ATP e) the light reaction
From a plant's perspective, the main purpose of photosynthesis is to Group of answer choices a)to produce sugars and oxygen for heterotrophs. b)plants are not cognitive organisms and therefore we have no idea what the "purpose" of photosynthesis is for the plant. c)to produce enough O2 gas for the plant to survive through the night. d)make sugars, such as glucose, to use for building cell walls and for energy needed by the plant.
If ribulose bisphosphate were removed from a chloroplast, which of the following statements would BEST describe the immediate result? b)ATP could not be produced in the thylakoid a) CO2 could not enter the Calvin cycle d) Light energy could not be trapped in the grana c) 02 could not enter the Calvin Cycle
Plants undergo both photosynthesis and cellular respiration. Why don’t plants simply use the ATP pro¬duced in the light reactions of photosynthesis to drive cellular processes? A) The ATP produced during photosynthesis is chemically different from the ATP produced during cellular respiration and cannot be used for anabolic reactions B) ATP cannot be stockpiled so the plants would have no energy during non-daylight hours C) The plants have no way of getting the ATP made during photosynthesis out of the chloroplasts to the rest of the cell D) Plants rely on cellular respiration to remove excess O2 and prevent photorespiration
In chloroplasts, the light reactions power the creation of ATP via chemiosmosis. In relation to this process, which of the following is true? a) ATP synthase breaks ATP down into ADP, creating energy to fuel chemiosmosis. b) Oxygen is used as a source of electrons to replace those lost in photosystem II. c) Chemiosmosis during the light reactions is also used in the reduction of NADPH and FADH2. d) As excited electrons fall back down to a lower energy state, they create a proton gradient that is used to fuel the phosphorylation of ADP.
Which of the following correctly sequences the steps of non-cyclic electron transport? a) Chlorophyll molecules absorb UV radiation exciting electrons which flow through photosystem I, returning to the chlorophyll molecules b) Electrons donated from water molecules pass through photosystem I then photosystem II before returning to the chlorophyll molecules, generating ATP in the process c) Water is oxidized by the capture of light energy; these excited electrons are passed through the dark reactions, returning to chlorophyll during the final light reactions d) The ATP and NADPH generated by the reactions of photosystem II and photosystem I are utilized by the Calvin Cycle to build high energy glucose molecules
Which of the following sequences correctly represents the flow of electrons during photosynthesis? A) NADPH →→02→CO₂ B) H₂O NADPH → Calvin cycle C) NADPH →chlorophyll → Calvin cycle D) H₂O → photosystem I → photosystem II E) NADPH electron transport chain → 02 Place these events in the correct order: absorption of electromagnetic radiation by chlorophyll, synthesis of sugars, utilization of carbon dioxide by Calvin cycle enzymes, synthesis of NADPH, synthesis of ATP, conversion of water into molecular oxygen. Is NADP+ oxidized or reduced during the light reactions? How do you know this? What would you expect to happen if you inactivated the NADP+ reductase?
The Calvin cycle, the "dark reaction" or Carbon fixation reactions of photosynthesis, cannot occur at night in a living plant. Which of the following best describes why this is true? A) The stomata are incapable of opening at night, thus CO2 cannot enter the leaf B) The reactions of the Calvin cycle are dependent on light reactions for high-energy compounds C) Several enxymes necessary for Calvin cycle activity have been degraded during the day and must be replaced D) Light is required to transport the water necessary for the cycle E) Cooler temperatures at night slow enzyme activity and rates of substrate diffusion
The respiration rate (as measured by the slope of the line) of an organism is calculated by O A) dividing the weight (g) of the organism by the amount of CO2 produced (ppm) B) dividing the time elapsed (per second) by CO2 produced (ppm) C) dividing the CO2 produced (ppm) by the weight of the organism (g) D) dividing the CO2 produced (ppm) by the time elapsed (per second)
1. A) For the schematic of a chloroplast shown in the image attached, match the major input and output molecules of photosynthesis to the letters shown. Molecules: CO2, H2O, O2, sugar A: B: C: D: B) In the image attached, the light reactions are shown to take place in the thylakoid. Where specifically do these reactions take place? C) Where does the Calvin cycle take place?
Which definition is INCORRECT? A) O Photoexcitation: light absorption leads to raising an electron to a higher energy state. C) O Photolysis: light absorption coupled to splitting a molecule. D) O Photophosphorylation: a form of substrate level phosphorylation used for ATP formation E) O Photosynthesis: is often photoexcitation and photolysis coupled with CO2 fixation and biosynthesis
Identify the correct compound to create a chemical equation that represents Photosynthesis. + Drag and drop the right reactants and products of the Light Dependent and Light Independent (aka Dark) Reactions. Chloroplast NADPH NADP+ ADP Water - H20 Calvin Cycle Glucose - C6H1206 ATP Light Reaction Thylakoids Stroma O2 Carbon Dioxide CO2 Identify the reactants and products that are used and given off by plants and animals.