Light Reactions Part 3: Making Oxygen and NADPH; Cyclic Electron Flow

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[h]Light Reactions Part 3, Flashcard Set 1

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[!]1a[/!]

[q]When ________ arrive at Photosystem 1, they have less energy than when they left Photosystem 2.

[textentry]

[a]When electrons arrive at Photosystem 1, they have less energy than when they left Photosystem 2.

[!]2a[/!]

[q]Electrons flow from Photosystem 2 to Photosystem 1 along the ______________________.

[textentry]

[a]Electrons flow from Photosystem 2 to Photosystem 1 along the electron transport chain.

[!]3a[/!]

[q]When _______ leave p700, that reaction center becomes oxidized.

[textentry]

[a]When electrons leave p700, that reaction center becomes oxidized.

[!]4a[/!]

[q]To replace its lost electrons, p700 accepts incoming electrons from Photosystem ___

[textentry]

[a]To replace its lost electrons, p700 accepts incoming electrons from Photosystem Two

[!]5a[/!]

[q]Electrons from Photosystem One flow to the electron acceptor ______.

[textentry]

[a]Electrons from Photosystem One flow to the electron acceptor NADP+.

[!]6a[/!]

[q]Whereas electron energy in Photosystem Two is used to pump _____, electron energy in Photosystem One is used to reduce NADP⁺.

[textentry]

[a]Whereas electron energy in Photosystem Two is used to pump protons, electron energy in Photosystem One is used to reduce NADP⁺.

[!]7a[/!]

[q]Whereas Photosystem Two powers creation of a proton gradient, Photosystem One’s energy is used to create ______.

[textentry]

[a]Whereas Photosystem Two powers creation of a proton gradient, Photosystem One’s energy is used to create NADPH.

[!]8a[/!]

[q]The products of the light reactions are ATP and NADPH. The by-product is ______.

[textentry]

[a]The products of the light reactions are ATP and NADPH. The by-product is oxygen.

[!]9a[/!]

[q]In Photosystem Two, reaction center p680 gets _______.

[textentry]

[a]In Photosystem Two, reaction center p680 gets oxidized.

[!]10a[/!]

[q]To replace lost electrons, p680 grabs electrons from water, which _________.

[textentry]

[a]To replace lost electrons, p680 grabs electrons from water, which dissociates.

[!]11a[/!]

[q]Dissociation of water by p680 creates two protons and an ______ atom (which element?).

[textentry]

[a]Dissociation of water by p680 creates two protons and an oxygen atom.

[!]12a[/!]

[q]Protons generated by dissociation of water by Photosystem Two accumulate in the ____________.

[textentry]

[a]Protons generated by dissociation of water by Photosystem Two accumulate in the thylakoid space.

[!]13a[/!]

[q]Protons that build up in the thylakoid space get there through proton pumping by Photosystem ___, and also by breakdown of water molecules by that same photosystem.

[textentry]

[a]Protons that build up in the thylakoid space get there through proton pumping by Photosystem Two, and also by breakdown of water molecules by that same photosystem.

[!]14a[/!]

[q]A side effect of water’s oxidation is enhancement of ___ creation by increasing the gradient for chemiosmosis.

[textentry]

[a]A side effect of water’s oxidation is enhancement of ATP creation by increasing the gradient for chemiosmosis.

[!]15a[/!]

[q]Non-cyclic flow electron flow is also called the ________

[textentry]

[a]Non-cyclic flow electron flow is also called the Z-scheme

[!]16a[/!]

[q]Non-cyclic electron flow generates ATP and _______, with oxygen generated as a by-product.

[textentry]

[a]Non-cyclic electron flow generates ATP and NADPH, with oxygen generated as a by-product.

[!]17a[/!]

[q]Cyclic electron flow generates only ___

[textentry]

[a]Cyclic electron flow generates only ATP

[!]18a[/!]

[q]Cyclic electron flow results from the fact that the Calvin Cycle uses less ______ than ATP.

[textentry]

[a]Cyclic electron flow results from the fact that the Calvin Cycle uses less NADPH than ATP.

[!]19a[/!]

[q]Buildup of NADPH during the ___________ inhibits reduction of NADP⁺.

[textentry]

[a]Buildup of NADPH during the light reactions inhibits reduction of NADP⁺.

[!]20a[/!]

[q]Buildup of NADPH blocks enzyme ______ sites in the enzyme NADP⁺ reductase

[textentry]

[a]Buildup of NADPH blocks enzyme binding sites in the enzyme NADP⁺ reductase

[!]21a[/!]

[q]When NADP⁺ reductase is blocked, electrons flow to a _____ ______ that returns them to the electron transport chain of Photosystem Two.

[textentry]

[a]When NADP⁺ reductase is blocked, electrons flow to a shunt pathway that returns them to the electron transport chain of Photosystem Two.

[!]22a[/!]

[q]In ______ electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

[textentry]

[a]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

[!]23a[/!]

[q]In cyclic electron flow, the sole use of electron energy is used to pump protons from the _____ to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

[textentry]

[a]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

[!]24a[/!]

[q]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ____.

[textentry]

[a]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

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[h]Light Reactions Part 3, Flashcard Set 2

[i]start

[!]1b[/!]

[q]When electrons arrive at Photosystem 1, they have ____ energy than when they left Photosystem 2.

[textentry]

[a]When electrons arrive at Photosystem 1, they have less energy than when they left Photosystem 2.

[!]2b[/!]

[q]The ______  center in Photosystem One is p700.

[textentry

[a]The reaction center in Photosystem One is p700.

[!]3b[/!]

[q]When electrons leave p700, that reaction center becomes ______.

[textentry]

[a]When electrons leave p700, that reaction center becomes oxidized.

[!]4b[/!]

[q]Electrons from Photosystem ____ flow to the electron acceptor NADP⁺.

[textentry]

[a]Electrons from Photosystem One flow to the electron acceptor NADP⁺.

[!]5b[/!]

[q]The enzyme that ______ NADP⁺ is NADP⁺ reductase.

[textentry]

[a]The enzyme that reduces NADP⁺ is NADP⁺ reductase.

[!]6b[/!]

[q]Whereas electron energy in Photosystem Two is used to pump protons, electron energy in Photosystem One is used to reduce _____.

[textentry]

[a]Whereas electron energy in Photosystem Two is used to pump protons, electron energy in Photosystem One is used to reduce NADP⁺.

[!]7b[/!]

[q]The products of the light reactions are ___ and NADPH. The by-product is oxygen.

[textentry]

[a]The products of the light reactions are ATP and NADPH. The by-product is oxygen

[!]8b[/!]

[q]In Photosystem ___, reaction center p680 gets oxidized.

[textentry]

[a]In Photosystem Two, reaction center p680 gets oxidized.

[!]9b[/!]

[q]To replace lost electrons, _____ grabs electrons from water, which dissociates.

[textentry]

[a]To replace lost electrons, p680 grabs electrons from water, which dissociates.

[!]10b[/!]

[q]Dissociation of water by ____ creates two protons and an oxygen atom.

[textentry]

[a]Dissociation of water by p680 creates two protons and an oxygen atom.

[!]11b[/!]

[q]______ generated by dissociation of water by Photosystem Two accumulate in the thylakoid space.

[textentry]

[a]Protons generated by dissociation of water by Photosystem Two accumulate in the thylakoid space.

[!]12b[/!]

[q]______ that build up in the thylakoid space get there through proton pumping by Photosystem Two, and also by breakdown of water molecules by that same photosystem.

[textentry]

[a]Protons that build up in the thylakoid space get there through proton pumping by Photosystem Two, and also by breakdown of water molecules by that same photosystem.

[!]13b[/!]

[q]Protons that build up in the thylakoid space get there through proton pumping by Photosystem Two, and also by breakdown of _____ molecules by that same photosystem.

[textentry]

[a]Protons that build up in the thylakoid space get there through proton pumping by Photosystem Two, and also by breakdown of water molecules by that same photosystem.

[!]14b[/!]

[q]A side effect of water’s oxidation is enhancement of ATP creation by increasing the gradient for ___________.

[textentry]

[a]A side effect of water’s oxidation is enhancement of ATP creation by increasing the gradient for chemiosmosis.

[!]15b[/!]

[q]________ electron flow generates ATP and NADPH, with oxygen generated as a by-product. 

[textentry]

[a]Non-cyclic electron flow generates ATP and NADPH, with oxygen generated as a by-product.

[!]16b[/!]

[q]Non-cyclic electron flow generates ATP and NADPH, with ______ generated as a by-product.

[textentry]

[a]Non-cyclic electron flow generates ATP and NADPH, with oxygen generated as a by-product.

[!]17b[/!]

[q]____ electron flow results from the fact that the Calvin Cycle uses less NADPH than ATP.

[textentry]

[a]Cyclic electron flow results from the fact that the Calvin Cycle uses less NADPH than ATP.

[!]18b[/!]

[q]Cyclic electron flow results from the fact that the Calvin Cycle uses less NADPH than ___.

[textentry]

[a]Cyclic electron flow results from the fact that the Calvin Cycle uses less NADPH than ATP.

[!]19b[/!]

[q]Buildup of NADPH during the light reactions inhibits _______ of NADP⁺.

[textentry]

[a]Buildup of NADPH during the light reactions inhibits reduction of NADP⁺.

[!]20b[/!]

[q]Buildup of NADPH blocks enzyme binding sites in the enzyme NADP⁺ ________

[textentry]

[a]Buildup of NADPH blocks enzyme binding sites in the enzyme NADP+ reductase

[!]21b[/!]

[q]When NADP⁺ reductase is blocked, electrons flow to a shunt pathway that returns them to the ___________________ of Photosystem Two.

[textentry]

[a]When NADP+ reductase is blocked, electrons flow to a shunt pathway that returns them to the electron transport chain of Photosystem Two.

[!]22b[/!]

[q]In cyclic electron flow, the sole use of ______ energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

[textentry]

[a]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

[!]23b[/!]

[q]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the _______ space, which generates a gradient that is used to power synthesis of ATP.

[textentry]

[a]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

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[h]Light Reactions Part 3, Flashcard Set 3

[i]start

[!]1c[/!]

[q]_________ flow from Photosystem 2 to Photosystem 1 along the electron transport chain.

[textentry]

[a]Electrons flow from Photosystem 2 to Photosystem 1 along the electron transport chain.

[!]2c[/!]

[q]The reaction center in Photosystem One is ____.

[textentry]

[a]The reaction center in Photosystem One is p700.

[!]3c[/!]

[q]To replace its lost _______, p700 accepts incoming electrons from Photosystem Two

[textentry]

[a]To replace its lost electrons, p700 accepts incoming electrons from Photosystem Two

[!]4c[/!]

[q]Electrons from Photosystem One flow to the electron _______ NADP+.

[textentry]

[a]Electrons from Photosystem One flow to the electron acceptor NADP+.

[!]5c[/!]

[q]The enzyme that reduces NADP+ is NADP+ ________.

[textentry]

[a]The enzyme that reduces NADP+ is NADP+ reductase.

[!]6c[/!]

[q]Whereas Photosystem Two powers creation of a ______ gradient, Photosystem One’s energy is used to create NADPH.

[textentry]

[a]Whereas Photosystem Two powers creation of a proton gradient, Photosystem One’s energy is used to create NADPH.

[!]7c[/!]

[q]The products of the light reactions are ATP and ______. The by-product is oxygen

[textentry]

[a]The products of the light reactions are ATP and NADPH. The by-product is oxygen

[!]8c[/!]

[q]In Photosystem Two, reaction center ____ gets oxidized.

[textentry]

[a]In Photosystem Two, reaction center p680 gets oxidized.

[!]9c[/!]

[q]To replace lost electrons, p680 grabs electrons from ____, which dissociates.

[textentry]

[a]To replace lost electrons, p680 grabs electrons from water, which dissociates.

[!]10c[/!]

[q]Dissociation of water by p680 creates two ______ and an oxygen atom.

[textentry]

[a]Dissociation of water by p680 creates two protons and an oxygen atom.

[!]11c[/!]

[q]Protons generated by dissociation of _____ by Photosystem Two accumulate in the thylakoid space.

[textentry]

[a]Protons generated by dissociation of water by Photosystem Two accumulate in the thylakoid space.

[!]12c[/!]

[q]Protons that build up in the thylakoid space get there through _________ by Photosystem Two, and also by breakdown of water molecules by that same photosystem.

[textentry]

[a]Protons that build up in the thylakoid space get there through proton pumping by Photosystem Two, and also by breakdown of water molecules by that same photosystem.

[!]13c[/!]

[q]A side effect of water’s ________ is enhancement of ATP creation by increasing the gradient for chemiosmosis.

[textentry]

[a]A side effect of water’s oxidation is enhancement of ATP creation by increasing the gradient for chemiosmosis.

[!]14c[/!]

[q]_________ flow electron flow is also called the Z-scheme

[textentry]

[a]Non-cyclic flow electron flow is also called the Z-scheme

[!]15c[/!]

[q]Non-cyclic electron flow generates ___and NADPH, with oxygen generated as a by-product.

[textentry]

[a]Non-cyclic electron flow generates ATP and NADPH, with oxygen generated as a by-product.

[!]16c[/!]

[q]______ electron flow generates only ATP

[textentry]

[a]Cyclic electron flow generates only ATP

[!]17c[/!]

[q]Cyclic electron flow results from the fact that the __________ uses less NADPH than ATP.

[textentry]

[a]Cyclic electron flow results from the fact that the Calvin Cycle uses less NADPH than ATP.

[!]18c[/!]

[q]Buildup of _______ during the light reactions inhibits reduction of NADP+.

[textentry]

[a]Buildup of NADPH during the light reactions inhibits reduction of NADP+.

[!]19c[/!]

[q]Buildup of ______ blocks enzyme binding sites in the enzyme NADP+ reductase

[textentry]

[a]Buildup of NADPH blocks enzyme binding sites in the enzyme NADP+ reductase

[!]20c[/!]

[q]When NADP+ _________ is blocked, electrons flow to a shunt pathway that returns them to the electron transport chain of Photosystem Two.

[textentry]

[a]When NADP+ reductase is blocked, electrons flow to a shunt pathway that returns them to the electron transport chain of Photosystem Two.

[!]21c[/!]

[q]When NADP+ reductase is blocked, electrons flow to a shunt pathway that returns them to the electron transport chain of Photosystem ___.

[textentry]

[a]When NADP+ reductase is blocked, electrons flow to a shunt pathway that returns them to the electron transport chain of Photosystem Two.

[!]22c[/!]

[q]In cyclic electron flow, the sole use of electron energy is used to pump ______ from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

[textentry]

[a]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

[!]23c[/!]

[q]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a ______ that is used to power synthesis of ATP.

[textentry]
[a]In cyclic electron flow, the sole use of electron energy is used to pump protons from the stroma to the thylakoid space, which generates a gradient that is used to power synthesis of ATP.

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