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Bio Photosynthesis: Light an Calvin Cycle > Photosynthesis > Flashcards

Photosynthesis Flashcards

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Biology 101 flashcards
1
Q

What are the 3 Parts in Light Reaction

A
  1. Photoexcitation and Photolysis
  2. Electron Transport
  3. Photophosphorylation( chemiosmosis)
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2
Q

What is the process of Photoexcitation and Photolysis

A
  • Excites electrons of the electron carriers from using the photon that was ammited by the Light Energy
  • The energy from light photon are use to split water to oxygen which releases more energy
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3
Q

Process of Electron Transport in Light Reaction

A
  • To do electrochemical Gradients (pumping hydrogen ions against its concentration gradients)
  • Helps for the final step for Light Reaction
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4
Q

Process of Photophosphorylation (chemiosmosis) in Light Reaction

A

-ATP synthesis due to electrochemical gradient and the proton motive force

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5
Q

What happens if the excited electro does not get accepted by electron carriers

A
  • They are gonna go back to ground state

- Heat and light are realized

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6
Q

Where Chlorophyll found?

A
  • Is found in the thylakoid membrane

- Is a cluster of PIGMENT

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7
Q

How many pigments in Photosystem Structure? Where is the primary electron acceptor located in the Photosystem Structure?

A
  • There are a few hundred pigments

- The Primary electron acceptor (PEA) is located beside reaction center chlorophyll

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8
Q

What are the 2 types of Photosystems

A
  • Photosystem 1 P700
  • Photosystem 2 P680
  • The number shot optimal wavelength for absorption
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9
Q

Where does the Electro Transport Chain occurs?

A

-In the thylakoid membrane

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10
Q

What are the three proton in Thylakoid membrane that help with moving Primary Electron Acceptors between complexex?

A
  • Plastquinone (Pq)
  • Plastocyanin(Pc)
  • Ferredoxin(Fd)
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11
Q

What are the four complex in the Electron Transport chain of Thylakoid membrane?

A 
ETC
-Photosystem 2 (PS2)(P680)
-Cytochrome Complex
-Photosystem 1 (PS1)(P700)
-NADP+ reductase (an enzyme)
ATP Synthesis
-ATP Synthase
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12
Q

Thylakoid Proteins: Photosystem 2

P680

A
  • Occurs first
  • PS@ absorb Light
  • Excited electron go in the reaction centre chlorophyll and is captured by the Primary Electron Accepter (PEA)
  • P680 loses an electron and now it will be oxidized (P680+)
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13
Q

Thylakoid Proteins: Plastquinone (Pq)

A
  • Helps the Primary Electron Accepter (PEA) to travel through ETC
  • Electron -> plastiquions
  • Since it is mobile, helps transfer that electron to the next complex
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14
Q

Thylakoid Proteins: Cytochrome Complex

A
  • The Pq helps transfer the electron from PS2 to Cytochrome Complex
  • While that is happening, the proton from the stroma are pumped agains its concentration gradient and into Lumen
  • Those Proton will later be used to synthesis ATP in ATP synthesis step
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15
Q

Thylakoid Proteine: Plastocyanin (Pc)

A
  • Electron form Cytochrome Complex is transferred through the use of Plastocyanin
  • This Pc is located on the lumen side of the Thylakoid membrane
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16
Q

Thylakoid Proteine: Photosystem 2 (PS1)(P700)

A
  • Another ETC occurs where this system takes the light photon form surrounding and uses it to excite electrons
  • This excited electron is captured by PEA and is send to the next stage leaving the system (PS1) oxidized
  • But the Pc that carried the electron will donate its electron to PS1 so it could go back to being neutral
17
Q

Thylakoid Proteine: Ferradoxin (Fd)

A
  • The PEA is now transferred to a mobile proton called Ferradoxin (Fd)
  • Ferradoxin is on the Stroma side
  • Carries the PEA to the next complex
18
Q

Thylakoid Proteine: NADP+ Reductase

A
  • NADP+ Reductase is an enzyme
  • The ferrodoxin helps transfer its electron to NADP+ reductase which helps put electron to the final electron accepter NADP+
  • NADP+ —> Reduced to NADPH
19
Q

What is the Purpose of NADPH

A

-NADPH will provide reducing power for the making of sugar in Calvin Cycle

20
Q

How does PH2 replace its lost electron?

A
  • we know that PS2 is a strong oxidizer
  • Electron from water (located in Lumen)is excited and they break
  • Those electron are used to help PH2 to become neutral form PH2+
21
Q

Thylakoid Proteins: ATP Synthase

A
  • Protons that were pumped through the stroma to the lumen in cytochrome complex and the protons that were created when replacing the lost electron in PS2 are used
  • ATP synthase uses those proton to pump them into it self like the Cellular Respiration
  • ATP is produced in the stroma

Bio Photosynthesis: Light an Calvin Cycle (4 decks)

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